There have been a few reports of Southern blight (Sclerotinia rolfsii) and White mold (Sclerotinia sclerotiorum) on tomato and pepper in New Jersey. Southern blight is much more common in vegetable areas south of the state where summer temperatures remain hotter (above 90°F) for longer periods of time. Like white mold, it can survive in […]
Continue reading...May 16, 2024 Andy Wyenandt
Understanding and controlling Rhizoctonia root rot
Even though much of New Jersey has had wet weather recently, which is more favorable to Pythium and Phytophthora development, Rhizoctonia root rot has been reported over the past few weeks in a number of crops. Rhizoctonia root rot, caused by Rhizoctonia solani, is an important soil-borne fungal pathogen with a very large host range. […]
Continue reading...May 15, 2024 Kris Holmstrom
IPM Update 5/15/24
Sweet Corn IPM personnel have deployed black light and corn earworm (CEW) pheromone trap networks in central and northern New Jersey counties. As we start our summer field technicians, trap checks are limited. However, even with cool weather and few traps visited, there have been low catches of CEW in several pheromone traps. While this […]
Continue reading...May 15, 2024 Andy Wyenandt
Diagnosing Collar Rot and Alternaria Stem Rot of Tomato
Collar rot (Alternaria linariae) or Alternaria stem rot (Alternaria alternata f. sp. lycopersici) of tomato are common in young tomato plants. Either can be particularly troublesome in seedlings that have been held in transplant flats for an extended period of time before transplanting in hot, humid greenhouses. Collar rot infections often start where a leaflet branch has been […]
Continue reading...May 14, 2024 Dave Schmitt and Kaitlin Quinn
Tree Fruit IPM Report for May 14, 2024
Peach: Bacterial Spot: Copper formulations should be used starting at petal fall to suppress bacterial spot. Generally we recommend starting at 0.5 ozs metallic copper and gradually lowering the rate as the season progresses. The rate applied will depend on the formulation. Dr. Lalancette published a chart listing common copper formulations and rates for peach […]
Continue reading...May 14, 2024 Andy Wyenandt
Theories on managing fungicide resistance development by tank mixing or rotating fungicides
The question of whether to tank mix high-risk (HR) fungicides with low-risk (LR) protectant fungicides or the rotation of HR fungicides with LR fungicides remains an open debate. The tank mixing or alternation of fungicides has been widely advocated as a means to delay or minimize the risks of resistance development (Genet et al., 2006; […]
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