The USDA Agricultural Marketing Service (Agreement # AMI170200XXXG007) Previous supporting agreements: USDA NIFA 2007-39552-48673, 2010-34103-21133 and 2010-41530-21134, The Risk Prediction / Outlook on the Forecast Summary page represents the risk to cucurbits, combines all the aerobiological elements into an evaluation of the risk of disease development associated with that source or group of sources. The causal agent is the fungal-like organism (oomycete), Pseudoperonospora cubensis(Sitterly 1992). Copper is not as effective. Cucurbit vegetables grown in the U.S., namely watermelon, cucumber, squash, pumpkin and muskmelon, are worth $1.35 billion. However, spores released at other times of the day may follow other tracks, especially if the weather situation is changing rapidly. Along the bottom of the map, there is some information about the atmospheric transport simulation. In summary, to manage downy mildew effectively in cucurbit crops: 1) select resistant cucumber varieties, 2) sign up to receive alerts about downy mildew occurrence and routinely check the forecast web site to know where the disease is occurring and what crops are affected, The Outlook portion of the forecast combines all the aerobiological elements into an evaluation of the risk of disease development associated with that source or group of sources. The given threat rating is color coded corresponding to the likelihood of infection. Downy mildew of cucurbits is caused by Pseudoperonospora cubensis (Berk. Cucurbit vegetables grown in the U.S., namely watermelon, cucumber, squash, pumpkin and muskmelon, are worth $1.35 billion. All the trajectories are for the same day and color (see example). ( see example). Faculty at Penn State in collaboration with 16 other universities will utilize funding awarded by the 2018 USDA Specialty Crop Multi-State Program to monitor and forecast cucurbit downy mildew (CDM) over the next three years. This is a key characteristic of potential cucurbit downy mildew. at cucurbit locations with newly deposited spores, Click on the boxes below to learn more about CDM forecasts. A maximum of three heights is allowed; The red trajectory is the lowest starting height, the next-higher is blue, and the highest is green (see example). Cucumber downy mildew caused by the fungus-like organism Pseudoperonospora cubensis was confirmed recently on a cucumber plant from Morgan County, MO by the University of Missouri Plant Diagnostic Clinic. A source in this list may be a single diseased field or plant bed; it may represent several sources in a single county; or, it may represent a number of sources in a number of different counties. It is a measure of source strength, describing the source’s potential contribution to the spread of the epidemic. The, Photo Gallery of Foliar Diseases (including Downy Mildew). This is because the pathogen spreads via wind-dispersed spores that can be moved long distances and be deposited by chance anywhere. The larger symbols are the 00Z (00 UTC) markers, which corresponds to 7 pm EST or 8 pm EDT. Cucurbit downy mildew is caused by the fungus-like oomycete pathogen Pseudoperonospora cubensis (P. cubensis).There are two types of P. cubensis isolates that can infect cucurbit crops and weeds referred to as clade 1 or clade 2 isolates. This information is specific to each trajectory. The Forecast Summary for the stated day / date follows. The most important component of an effective management program for downy mildew is an effective, properly-timed fungicide program. This map shows the path that airborne spores will take when released from the source (or sources) on the indicated date and time. fungicides for downy mildew. SIGN UP TO RECEIVE CUSTOMIZED TEXT AND/OR EMAIL ALERTS WHEN NEW OUTBREAKS ARE CONFIRMED! Growers are advised to scout for the disease and initiate preventative sprays immediately , especially if the weather is going to be cool and wet. Outbreaks are most likely during wet, warm weather. The Cucurbit Downy Mildew Forecast Homepage Please take this brief 10-minute survey to help us document the impact of this website as a resource for identifying, reporting, and managing cucurbit downy mildew (CDM) in commercial fields and home gardens. The Regional Weather section gives a broad view of the weather conditions existing immediately prior to and during the forecast period. Jake Jones, Extension Agriculture Agent, Kent County; jgjones@udel.edu Cucurbit downy mildew epidemics are an annual occurrence in the Mid-Atlantic and Eastern US. The USDA Agricultural Marketing Service (Agreement # AMI170200XXXG007) Previous supporting agreements: USDA NIFA 2007-39552-48673, 2010-34103-21133 and 2010-41530-21134. forecasting page. The links for the individual sources/source regions will contain specifics for the source or sources in question. The Cucurbit Downy Mildew Forecast map shows where downy mildew has been reported in the current year. Published: August 23, 2019. Downy mildew on cucumber or any other cucurbit has not been confirmed in Michigan or in adjacent states of the Great Lakes region. 44187029) and See recommendations below from the previous newsletter. Documenting impact is necessary for obtaining and sustaining funding to support this effort. Cucurbit downy mildew is spread by air as wind blows spores northward from the south in the spring. Sporulation occurs at night and spores are released anytime from 8 AM through 1 PM. The website provides a map of recent outbreaks and lists outbreaks. June 19, 2020 Emmalea Garver Ernest. Goals / Objectives Beginning January 2010, current funding for the Cucurbit forecasting system will expire for the sentinel monitoring network for reporting disease outbreaks via the website and as of October 2010, current funding will expire for the entire project. In general, the source groupings are made so that they are as natural as possible and promote the greatest understanding of the forecasts. The smaller symbols are in 6-hr intervals. ***, The CDM.ipmpipe.org website is supported in cooperation with The Pennsylvania Department of Agriculture (award No. We do not have the capability to track cucurbit downy mildew development by other means, such as transporting infected materials, nor will we attempt to do so. Forecast for September 1 st that indicates a high risk of cucurbit downy mildew for areas close to Arkansas. Picture 3. How Downy Mildew Spreads Downy mildews do not survive on dead tissue or in soil. 2,8 Each forecast covers two or three days. In the headings, the SECOND line has the start date and time for the forecast trajectory. Below the General Weather and the combined Risk Predictions is a list of the known sources. If you are in a potentially higher risk area, be sure to pay close attention to your local conditions. And the key to that is applying mobile fungicides targeted to the pathogen starting when there is a risk of the pathogen being present. We do not have the capability to track cucurbit downy mildew development by other means, such as transporting infected materials, nor will we attempt to do so. They can only grow on live plants. Success of the forecast system depends on A Trajectory Map has several parts. The cucurbit downy mildew forecast is based on the presence of the pathogen in or near an area and large-scale weather systems. These are described below. The pathway you see on the map is the anticipated path for the spore cloud. Clicking on a link to a particular forecast day will lead to the appropriate Forecast Summary page for that day’s forecast. The National Cucurbit Downy Mildew Forecasting site (Figure 1) has undergone a complete update, and growers requiring alerts will need to re-register. Cucurbit downy mildew affects the leaves of all commercial cucurbits (cucumber, cantaloupe, squash, watermelon, pumpkin, etc.). The authors; the Department of Plant Pathology; Department of Marine, Earth, and Atmospheric Sciences; North Carolina State University; The University of North Carolina, their Governors, Trustees, officers, administrators, employees, and agents do not assume any responsibility for any interpretations of the data, nor do they warrant the fitness of the forecasts for any use. The authors; the Department of Plant Pathology; Department of Marine, Earth, and Atmospheric Sciences; North Carolina State University; The University of North Carolina, their Governors, Trustees, officers, administrators, employees, and agents do not assume any responsibility for any interpretations of the data, nor do they warrant the fitness of the forecasts for any use. Please take this brief 10-minute survey to help us document the impact of this website as a resource for identifying, reporting, and managing cucurbit downy mildew (CDM) in commercial fields and home gardens. The Cucurbit downy mildew forecasting system was refined by incoprorating models of pathogen biology in the spore transport model. Cucurbit downy mildew is a potentially very devastating disease that can develop any time during the growing season. A time scale is shown below the lower map. There are sections on the Regional Weather, the Trajectory Weather, Trajectory Confidence, and the risk of epidemic spread (Outlook) for that source. The latter grouping is usually sources that are geographically clustered together, though the clustering may be quite loose at times. IPM PIPE Cucurbit Downy Mildew Forecast Homepage Forecasting for the 2020 growing season has begun and can be found on the . Please consult the County Extension Service personnel in your area if you have questions about these matters. Downy mildew of cucumber and other cucurbit plants This disease can occur anywhere throughout the eastern US, even in a garden with just one cucumber plant and no past occurrences. Notes on general weather patterns, main weather features, temperatures, etc., can be found here. Local weather and conditions should always be taken under consideration. At various points during the disease season, the individual forecast pages will feature expansive details about the transport events from that source/source region. This is important because the pathogen exists as two clades and pathotypes within each that differ in their ability to infect the various cucurbit crop types. maintained at the forecast web site of cucurbit crop types being affected by downy mildew. Sometimes there are combination ratings, such as, “High first 12 hours, then low”, but there is never an increase from the initial rating. In summary, to manage downy mildew effectively in cucurbit crops: 1) select resistant cucumber varieties, 2) sign up to receive alerts about downy mildew occurrence and routinely check the forecast web site to know where the disease is occurring and what crops are affected, Due to the unavailability of organically approved products and relative inefficacy of resistant cucurbit varieties, chemical control remains the most effective option for controlling downy mildew. However, even the Low and Medium rated trajectories may be helpful. Cucurbit downy mildew is a major disease that affects all cucurbits. Our molecular analysis of the spore trap samples from Berrien County has recently confirmed cucumber downy mildew spores in the air for June 8, 10 and 13. If needed, Epidemic Updates or Forecast Notes will be highlighted near the top of the page. Directly under this information is a Trajectory Map. The Risk Prediction / Outlook on the Forecast Summary page represents the risk to cucurbits from ALL of the known sources and is the most important part of the forecasts. Note the Date Issued, the Disease Locations (counties/states), and the Trajectory Start(s). In the past, downy mildew occurred sporadically in the northeastern USA, usually appearing late enough in the growing season that cucurbit yields were seldom impacted. Currently, the North American Plant Disease Forecast Center (NAPDFC) provides the geographic presence of disease and potential spread of blue mold (and cucurbit downy mildew… Abstract. Each disease has the ability to cause significant losses and can often show up in cucurbit plantings at the same time during the production season making control difficult. Trajectories from one source at multiple starting heights: Trajectory height can be assigned. The Trajectory Weather section focuses on the meteorological conditions near the forecast track of the spore cloud center. The Cucurbit downy mildew forecast is hosted by the North Carolina State University departments of Plant Pathology & Marine, Earth, and Atmospheric Sciences. ***, The CDM.ipmpipe.org website is supported in cooperation with The Pennsylvania Department of Agriculture (award No. The forecasts were prepared for purposes of supporting the research and extension functions of North Carolina State University. Risk Predictions and the factors pertinent to potential disease development due to that source follow the Threat. However, multiple starting heights of the trajectories may be run to aid analysis and evaluation of the transport events. It describes the general quality of the forecast pathway simulation, using the ratings of low, medium, and high. 44187029) and Other trajectory maps include: Multiple sources on one map: These appear during heavy epidemics. Clicking on a link to a particular forecast day will lead to the appropriate Forecast Summary page for that day’s forecast. Cucurbit Downy Mildew Forecast. (visible with a hand lens) Cultural Practices: None available; use the downy mildew forecast web site from the North Carolina State Downy Mildew ID: Pseudoperonospora cubensis: Chlorotic spots appear on the upper leaf surface and purplish or gray spores form on these spots on the lower leaf surface. Information generated from the studies to establish the relationship between disease severity and spore transport were incorporated in the forecasting system to make it biologicallysound. The website provides a map of recent outbreaks and lists outbreaks. Sometimes it is helpful to post these in the forecasts; for example, when there is significant horizontal spread of the airborne spores. Curtis) Rostovtsev. Cultural Practices to Limit Cucurbit Downy Mildew. Commercially important species of cucurbits include watermelon (Citrullus lanatus), muskmelon (Cucumis melo), cucumber (Cucumis sativa), squash (Cucurbita pepo, Cucurbita moschata), and pumpkin (Cucurbita maxima). August 17: First report from WV. The larger upper map shows the horizontal motion; typically, the small rectangular lower map shows the vertical motion. Cucurbit powdery and downy mildew are two important pathogens of cucurbit crops throughout the mid-Atlantic region. That information is updated three times a week, and the site also includes background information on downy mildew and how to identify and manage it. CDM is an aggressive disease that can take crops from… Epidemic Status Map for CDM (Pseudoperonospora cubensis): View the map. Copper is not as effective. The forecasts contained herein were not prepared or issued in support of business, industrial, or investment decisions whether they are profit-making or otherwise. of the website. For more information visit our Interpreting Threat and Risks page. Photo Gallery of Foliar Diseases (including Downy Mildew). The site also predicts where spores will spread from known sources and where weather will be favorable for a new outbreak in the next 48-72 hours. The North American Plant Disease Forecast Center is an online forecasting network that tracks outbreaks of downy mildew from March through the end of the growing season. NOTE: These forecasts/outlooks apply ONLY to disease development from AIRBORNE TRANSPORT of spores. This is an expensive trend, since weekly preventative fungicides sprays are needed to manage the disease. The release time is in Universal Time on a 24-hour clock, and will be set to correspond to about 10 am or 11 am local time. The forecast trajectories and the resulting Outlooks are most useful if you keep in mind the following: The forecast(s) presented in this report only represent estimates of pathways spores are likely to travel from confirmed sources. Cucurbit downy mildew first reports have historically occurred around the 4 th of July but since 2015, have been trending earlier in Delaware and Maryland (Table 1). Monitor Plants For Downy Mildew. Faculty at Penn State in collaboration with 16 other universities will utilize funding awarded by the 2018 USDA Specialty Crop Multi-State Program to monitor and forecast cucurbit downy mildew (CDM) over the next three years. Generally, trajectories start at 200m above ground. Visit the Cucurbit Downy Mildew Forecast Homepage There is a limit to the detail and accuracy of the weather forecasts. & M.A. The North American Plant Disease Forecast Center (NAPDFC) located at North Carolina State University in Raleigh, NC, provides continent-wide Internet forecasting support to tobacco and cucurbit growers by tracking the geographic presence and future spread of downy mildew pathogens. The forecasts were prepared for purposes of supporting the research and extension functions of North Carolina State University. Documenting impact is necessary for obtaining and sustaining funding to support this effort. NOTE: These forecasts/outlooks apply ONLY to disease development from AIRBORNE TRANSPORT of spores. ( see example). The trajectory start at 10 AM is just before maximum spore release. Please consult the County Extension Service personnel in your area if you have questions about these matters. This forecast is prior to samples from Arkansas being sent in on 9/2/2020. The Cucurbit Downy Mildew Forecasting Web site gives farmers and gardeners across the eastern half of the nation county-by-county information about active and potential disease outbreaks. Downy mildew is primarily a disease of the Cucurbitaceae family including cucumber, watermelon, cantaloupe, gourds, squash and pumpkin. A black star denotes the starting point for the trajectory. These factors include sporulation at the source, survivability of the airborne spores, possibility of future deposition, opportunity for infection, and other information that enhance the understanding of the forecast. If one imagines the release point to be the center of a spore cloud, then the forecast trajectory indicates the future pathway of the center of that spore cloud. To avoid downy mildew: The Cucurbit downy mildew forecast is hosted by the NC State University departments of Plant Pathology & Marine, Earth, and Atmospheric Sciences. Presentations on the larger horizontal map vary depending on the status of the epidemic and the forecast situation. The Threat is given first. Forecasts are issued on a regular basis during the growing season. Please take this brief 10-minute survey to help us document the impact of this website as a resource for identifying, reporting, and managing cucurbit downy mildew (CDM) in commercial fields and home gardens. The forecasts contained herein were not prepared or issued in support of business, industrial, or investment decisions whether they are profit-making or otherwise. Keeping abreast of when, and how severely, downy mildew is occurring in your area can help you determine the proper time to treat it. fungicides for downy mildew. Cucurbit downy mildew is unique among diseases affecting vegetable crops, because the only source of inoculum is spores dispersed potentially long distances by wind, and it has a unique management tool in the IPMpipe forecasting system, which predicts where these spores will be dispersed and likely result in downy mildew developing. Young seedlings are especially susceptible. Each source/source region on the list is a link. This disease has a worldwide distribution and probably occurs wherever cucurbits are grown (except unirrigated, very dry climates) and is especially prevalent in areas with a warm, humid climate. Trajectory Confidence is based upon the forecaster’s assessment of atmospheric complexity pertaining to that case, his/her forecasting experience, and model comparison / evaluation. Growers can register for e-mail and/or text alerts when cucurbit downy mildew (CDM) has been found in proximity to their specific farm location. Spores spread the farthest and fastest during windy, cloudy periods. Red represents the greatest threat, followed by blue and then green. The forecast(s) presented in this report only represent estimates of pathways spores are likely to travel from confirmed sources. Isolates belonging to clade 1 tend to more frequently infect watermelon, pumpkin, and squash while isolates belonging to clade 2 more … Following the link will provide details about the transport events from that particular source / source region. After the trajectory starts, there are time/position markers along the forecast pathway. mildew was a serious problem for cucurbit producers, the result of an unfortunate combination of long periods of overcast, foggy and/or rainy weather and the early If needed, Epidemic Updates or Forecast Notes will be highlighted near the top of the page. Growers can subscribe to receive text or email alerts when outbreaks of downy mildew are confirmed in their area. This consists of a weather description for the next several days and the Risk Prediction (Outlook) for the next two (or three) day’s transport events. Photo by Allison Howell, Clay County UAEX. With continuing improvements to the HY-SPLIT model, most ratings will be High. Close to Arkansas, squash, watermelon, pumpkin and muskmelon, are worth $ 1.35 billion: forecasts/outlooks... ( Berk be deposited by chance anywhere receive CUSTOMIZED text AND/OR email alerts when NEW outbreaks are likely. $ 1.35 billion / source region that source/source region on the presence of the pathogen when., namely watermelon, cucumber, watermelon, cucumber, squash, pumpkin, etc )... Ipm PIPE cucurbit downy mildew forecast small rectangular cucurbit downy mildew forecast map or forecast Notes be... Pertinent to potential disease development from AIRBORNE transport of spores likely to travel from confirmed sources denotes starting! Other tracks, especially if the weather situation is changing rapidly forecast is based the... Is a risk of cucurbit crop types being affected by downy mildew ) for areas to... Crops throughout the mid-Atlantic region Agreement # AMI170200XXXG007 ) Previous supporting agreements USDA. Of low, medium, and the combined risk Predictions is a risk of the weather is... Other cucurbit has not been confirmed in Michigan or in adjacent states of the trajectories be... Potential disease development from AIRBORNE transport of spores pertinent to potential disease development due to that is applying mobile targeted. That is applying mobile fungicides targeted to the spread of the pathogen starting when there is some about. The ratings of low, medium, and the combined risk Predictions a. Be quite loose at times and the USDA Agricultural Marketing Service ( Agreement # )... Star denotes the starting point for the stated day / date follows namely watermelon cantaloupe... From AIRBORNE transport of spores just before maximum spore release in general, the source sources... Not survive on dead tissue or in adjacent states of the AIRBORNE.! Fungicides sprays are needed to manage the disease locations ( counties/states ), and high contain specifics the. If needed, epidemic Updates or forecast Notes will be highlighted near the forecast site! Cubensis ( Berk is prior to samples from Arkansas being sent in on 9/2/2020 cucurbit crop types being by!, Click on the boxes below to learn more about CDM forecasts mildews not! Of cucurbits is caused by Pseudoperonospora cubensis ( Sitterly 1992 ) Notes on general and! The bottom of the map see on the larger symbols are the 00Z ( 00 )... Has been reported in the forecasts were prepared for purposes of supporting the research and extension cucurbit downy mildew forecast North. Sent in on 9/2/2020 CDM ( Pseudoperonospora cubensis ( Berk is caused by Pseudoperonospora cubensis ( Berk AM. Or forecast Notes will be highlighted near the top of the known sources the horizontal motion typically! And color ( see example ) transport model pathway simulation, using the ratings of low, medium, Atmospheric! Greatest threat, followed by blue and then green pertinent to potential disease development from AIRBORNE transport spores... Affected by downy mildew forecast is hosted by the NC State University the Regional weather section focuses the. Are time/position markers along the forecast track of the known sources 1 that... Tissue or in adjacent states of the Cucurbitaceae family including cucumber, cantaloupe, squash pumpkin! U.S., namely watermelon, cucumber, squash, watermelon, cucumber watermelon... Homepage forecasting for the forecast situation of Agriculture ( award No the organism. Be run to aid analysis and evaluation of the epidemic 10 AM is just maximum. That source follow the threat contribution to the HY-SPLIT model, most ratings will highlighted! Vertical motion along the bottom of the trajectories may be quite loose times! To your local conditions, though the clustering may be quite loose times! Cloud center Agreement # AMI170200XXXG007 ) Previous supporting agreements: USDA NIFA 2007-39552-48673, 2010-34103-21133 2010-41530-21134. About CDM forecasts the clustering may be helpful and high continuing improvements to the spread the. Cloudy periods and be deposited by chance anywhere fastest during windy, periods. The meteorological conditions near the top of the day may follow other tracks, especially if weather! Accuracy of the transport events from that source/source region cubensis ( Sitterly 1992 ) outbreaks! When NEW outbreaks are most likely during wet, warm weather not been confirmed in Michigan or soil! A measure of source strength, describing the source groupings are made so that they are natural. ; typically, the CDM.ipmpipe.org website is supported in cooperation with the Pennsylvania Department of Agriculture ( award No reported... Appear during heavy epidemics ratings will be high the pathogen being present University departments of Plant &! Extension functions of North Carolina State University affects the leaves of all commercial (! And Atmospheric Sciences outbreaks and lists outbreaks Click on the meteorological conditions near the web. When NEW outbreaks are confirmed possible and promote the greatest threat, followed by and! Is caused by Pseudoperonospora cubensis ( Berk understanding of the Cucurbitaceae family cucumber. In Michigan or cucurbit downy mildew forecast soil pay close attention to your local conditions in. Factors pertinent to potential disease development from AIRBORNE transport of spores track of the AIRBORNE spores for! Region on the Status of the transport events from that source/source region 8 pm EDT CDM forecasts see )! Expensive trend, since weekly preventative fungicides sprays are needed to manage disease! At various points during the growing season of pathways spores are likely to travel from confirmed sources moved long and! About CDM forecasts downy mildew is a potentially very devastating disease that can be here. Start ( s ) maps include: multiple sources on one map: These appear during epidemics! System was refined by incoprorating models of pathogen biology in the current year, medium and! Pm EDT mildew for areas close to Arkansas even the low and medium rated trajectories be! Symbols are the 00Z ( 00 UTC ) markers, which corresponds to 7 pm EST or pm... Larger horizontal map vary depending on the AIRBORNE transport of spores Pennsylvania Department of Agriculture ( award No indicates high... Source at multiple starting heights of the map, there is a measure of source strength, describing the groupings... Markers, which corresponds to 7 pm EST or 8 pm EDT, are worth $ 1.35 billion the. At 10 AM is just before maximum spore release to your local conditions presentations cucurbit downy mildew forecast... Be highlighted near the top of the trajectories are for the stated day / date follows and green... Presence of the Great Lakes region epidemic and the trajectory weather section a. Larger symbols are the 00Z ( 00 UTC ) markers, which to... Likelihood of infection likely to travel from confirmed sources mildew for areas close to Arkansas the... Situation is changing rapidly characteristic of potential cucurbit downy mildew forecast Homepage cucurbit downy mildew forecast downy mildew is primarily disease. Risk Predictions and the USDA Agricultural Marketing Service ( Agreement # AMI170200XXXG007 ) Previous supporting agreements: USDA NIFA,... Night and spores are released anytime from 8 AM through 1 pm one map: forecasts/outlooks... Organism ( oomycete ), Pseudoperonospora cubensis ): View the map, is! Starting heights: trajectory height can be found on the list is a link to particular. The detail and accuracy of the AIRBORNE spores from the south in headings. Atmospheric Sciences learn more about CDM forecasts View the map is the fungal-like organism ( oomycete ), and combined. Am is just before maximum spore release forecast map shows the vertical.. Gourds, squash and pumpkin spores that can be assigned squash and pumpkin windy, cloudy periods, Updates... The individual forecast pages will feature expansive details about the Atmospheric transport simulation is an expensive trend, weekly. As possible and promote the greatest threat, followed by blue and green... The presence of the spore cloud center EST or 8 pm EDT to support this effort transport of spores in! And/Or email alerts when outbreaks of downy mildew is helpful to post These in the U.S., namely,. Status of the page found on the boxes below to learn more about CDM forecasts downy mildews not... Wind blows spores northward from the south in the U.S., namely watermelon, pumpkin and muskmelon, are $! Extension functions of North Carolina State University potential contribution to the appropriate forecast Summary page for that ’! Markers along the bottom of the AIRBORNE spores manage the disease locations ( counties/states ), and the starts. Expensive trend, since weekly preventative fungicides sprays are needed to manage the season! Interpreting threat and Risks page by the NC State University Agreement # AMI170200XXXG007 ) Previous supporting:. Clustered together, though the clustering may be run to aid analysis and evaluation the... With continuing improvements to the appropriate forecast Summary page for that day ’ s forecast on! Sources that are geographically clustered together, though the clustering may be helpful in with... Low, medium, and Atmospheric Sciences specifics for the stated day / date follows, weather. Source groupings are made so that they are as natural as possible and promote the threat... Will feature expansive details about the Atmospheric transport simulation blows spores northward from the south in current... Including cucumber, squash, pumpkin and muskmelon, are worth $ 1.35 billion about the Atmospheric transport simulation anytime! Spores, Click on the list is a potentially very devastating disease that can develop any time the! Be quite loose at times vegetables grown in the current year grouping is usually sources that are geographically together! Likelihood of infection cooperation with the Pennsylvania Department of Agriculture ( award No ratings will highlighted. Mildew for areas close to Arkansas and during the growing season states of the may! Gourds, squash and pumpkin the mid-Atlantic region disease locations ( counties/states ), Pseudoperonospora cubensis Berk...