Leaf mold occasionally appears in high tunnel or greenhouse tomato production in New Jersey. However, under ideal conditions the disease will develop in field-grown crops. The fungus will cause infection under prolonged periods leaf wetness and when relative humidity remains above 85%. If relative humidity is below 85% the disease will not occur. Therefore, the […]
Continue reading...April 9, 2020 Andy Wyenandt
Identifying and controlling leaf mold in high tunnel & greenhouse tomato production
April 9, 2020 Andy Wyenandt
Identifying white mold in greenhouse & high tunnel tomato production
White mold, or timber rot, is caused by the soil-borne fungal pathogen, Sclerotinia sclerotiorum. The photo on right shows a high tunnel tomato plant with main stem infected by white mold. Over time the entire plant will slowly collapse looking similar to a wilt or root rot pathogen as the water supply is cut off […]
Continue reading...April 8, 2020 Kris Holmstrom and Joe Ingerson-Mahar
Allium leaf miner update: 04/09/20
Allium Leaf Miner Allium leaf miner (ALM) adults were captured in higher numbers (16/week) on yellow cards in Princeton (Mercer Co.), NJ on Tuesday of this week, while lower numbers (2) were found near Milford, Hunterdon County. Additionally, a garlic field near Asbury on the Warren/Hunterdon border was found to have 64% of plants exhibiting […]
Continue reading...April 8, 2020 Andy Wyenandt
Phytophthora and pythium control during wet weather
Most of New Jersey has been plagued by heavy regular rains and pop-up thunderstorms making conditions ideal for pathogens such as Phytophthora and Pythium. Unfortunately, Pythium and Phytophthora blight can be found on most farms in the southern part of the state. Poor crop rotations with susceptible hosts only make matters worse. The Phytophthora pathogen […]
Continue reading...April 8, 2020 Andy Wyenandt
Controlling purple blotch in leeks and onion
Purple blotch – Purple blotch, caused by Alternaria porri, may survive on infected plant material in overwintered plantings and may cause problems in spring transplanted fields and seedbeds. Symptoms of Purple blotch include tannish-brown, elongated, concentric, circular lesions with chlorotic margins with lesions running parallel with leaf veins. As the weather begins to warm up […]
Continue reading...April 7, 2020 Dave Schmitt
Tree Fruit IPM Report for April 7, 2020
Special Announcement! : The long awaited update to the NJ Commercial Tree Fruit Production Guide is available. We have updated the pesticide tables to include new products, pesticide safety, and efficacy. We hope to have the text sections updated for 2021. Tree Fruit Phenology: Tree Fruit Phenology remains advanced, but development is slowing. In southern […]
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