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Sweet Corn
Catches of European corn borer (ECB) are now in decline through much of the state. Remaining areas of highest activity include parts of Morris and Warren counties (see ECB map).
ECB infestations are now rising in sweet corn plantings. Feeding ranges from single digits to 12% in areas where IPM personnel are operating.
Vegetable Crops Edition
Seasonal updates and alerts on insects, diseases, and weeds impacting vegetable crops. New Jersey Commercial Vegetable Production Recommendations updates between annual publication issues are included.
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June 10, 2015 Kris Holmstrom and Joe Ingerson-Mahar
Veg IPM Update: Week Ending 6/10/15
June 3, 2015 Kris Holmstrom and Joe Ingerson-Mahar
Veg IPM Update: Week Ending 6/3/15
Sweet Corn
Cold temperatures and rain this week have prevented catches of European corn borer (ECB) from rising, and much of the activity represented in the map occurred over the weekend. Areas of highest activity include parts of Hunterdon, Morris and Burlington counties (see ECB map). Low level ECB infestations are present in early sweet corn plantings, and will become more significant with the return of drier weather.
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June 3, 2015 Andy Wyenandt
Basil Downy Mildew Reported: Southern New Jersey – 6/3/15
Basil downy mildew (Peronospora belbahrii) has been found in a field near Vineland, New Jersey. This is the first report of downy mildew in field-grown basil in New Jersey this year. All basil growers need to scout on a daily basis and initiate a preventative fungicide program.
May 31, 2015 Andy Wyenandt
White Mold in Greenhouse & High Tunnel Tomato
White mold, or timber rot, caused by the soil-borne fungal pathogen, Sclerotinia sclerotiorum, was found this past week in a high tunnel.
High tunnel tomato plant with main stem infected by white mold.
White mold is common and once introduced into a field or high tunnel it can very difficult to control. The pathogen produces black sclerotia on the surface and inside infected stems. Sclerotia, if they make their way back into the soil, can survive for years causing significant problems.
Infected stems will turn a light brown color and dry up becoming brittle. If the main stem is infected the entire plant will collapse looking like a wilt or root rot issue.
Under hot, humid conditions white fungal growth will develop on the surface of the stems and in some cases sclerotia will develop on the outside of the stem. Breaking open the stem will reveal numerous black sclerotia.
All infected plants and or plant material need to be removed from the greenhouse or high tunnel immediately and disposed of properly. Preventative protectant fungicide programs beginning at flowering will help control white mold. Cool, wet weather and poor air circulation favors disease development.
Tomato stem infected by white hold. Note the fungal growth on the surface of the stem.
White mold of tomato. Note the black sclerotia developing inside the brittle stems.
May 31, 2015 Andy Wyenandt
Wet Weather and Strawberry Fruit Rots
Wet weather is expected to come in during the first part of the week and linger around for most of it. Now that strawberries are in full production growers need to pay close attention to fruit rots such as anthracnose and botrytis. Overipe or unharvested mature berries left in commercial or u-pick fields can act as sources of inoculum for both pathogens. Importantly, both pathogens can develop and spread rapidly under wet, rainy conditions and the appropriate protectant fungicides need to be applied ahead of any inclement weather.
Botrytis, or grey mold, on mature strawberry fruit. Botrytis can develop and spread rapidly under cool, wet conditions.
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May 28, 2015 Kris Holmstrom and Joe Ingerson-Mahar
Veg IPM Update: Week Ending 5/27/15
Sweet Corn
European corn borer map
May 27, 2015
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