This week: Bacterial leaf spot of bell pepper; Leather rot of strawberry; and Phytophthora crown rot of eggplant.
Bacterial leaf spot of bell pepper
Leather rot of immature strawberry fruit
Phytophthora crown rot of eggplant.
May 10, 2015 Andy Wyenandt
Early-season Phytophthora blight control in pepper
Phytophthora blight typically develops in low-lying areas after a heavy rain and can spread quickly throughout the entire field.
Cultural Recommendations
Planting on a ridge or raised, dome-shaped bed will help provide better soil drainage. Use a minimum 3-year crop rotation with crops other than pepper, cucurbit, lima and snap beans, eggplant, or tomato. In fields with low-lying or wet areas, plant only Phytophthora-resistant/tolerant bell pepper cultivars such as ‘Paladin’, ‘Turnpike’, ‘Aristotle’, ‘1819’, ‘Intruder’, ‘Archimedes’, or ‘Revolution’. In heavily-infested pepper fields with a known history of Phytophthora blight, plant only tolerant cultivars to help reduce plant losses. If mefenoxam-insensitivity is known to exist in a field/farm, plant only tolerant cultivars. Do not apply mefenoxam or metalaxyl in fields where insensitivity is known to exist.
[Read more…]
April 21, 2015 Andy Wyenandt
Early-season Pythium and Phytophthora Control in Pepper and Tomato Crops
“What should I do to help prevent Pythium and Phytophthora in my pepper and tomato crops early in the season?” is a question most often asked this time of year. In the past, the answer was simple. Apply mefenoxam (Ridomil Gold SL, Ultra Flourish, 4) or metalaxyl (MetaStar, 4). Problem solved, right?
Not exactly, with resistance development in Phytophthora (P. capsici) to both mefenoxam and metalaxyl, the correct answer isn’t as simple anymore. It’s important to remember that both chemistries will work very well as long as resistance hasn’t been detected on your farm. How do you know if you have resistance? The easiest way is to follow efficacy. [Read more…]
March 18, 2014 Andy Wyenandt
Bacterial Leaf Spot Update
Last summer a pepper differential trial was done near Vineland, NJ to help determine if new races of bacterial leaf spot (BLS) were present in the area. At least 11 races of BLS have been identified to date.
…look at ways to detect the presence of BLS susceptibility on your farm. Run your own internal “tests”: plant a few cultivars with known BLS resistance and take note which ones develop symptoms. Be ready to adopt cultivars with a larger BLS resistance package.
May 19, 2013 Andy Wyenandt
Protecting against Pythium and Phytophthora blight
With the wet weather we’ve experienced in New Jersey over the weekend and the warm temperatures to follow this coming week Phytophthora blight (P. capsici) and Pythium are likely to start showing up in pepper, tomato, and cucurbit fields. [Read more…]
