Protectant (contact) fungicides, such as the inorganics (copper, FRAC group M01) and sulfur (FRAC code M02); the dithiocarbamates (mancozeb, M03), phthalimides (Captan, M04), and chloronitriles (chlorothalonil, M05) are fungicides which have a low chance for fungicide resistance to develop. Protectant fungicides typically offer broad spectrum control for many different pathogens. Why wouldn’t fungi develop resistance […]
Continue reading...January 21, 2020 Andy Wyenandt
Got humidity in the greenhouse? Get rid of it!
Unfortunately, closed greenhouses retain heat and unwanted humidity which can spell problems if left unchecked, especially during prolonged periods of overcast days and cooler weather. Remember, high relative humidity equals wet leaves which can favor the development of diseases such as Botrytis or bacterial diseases such as bacterial leaf spot. To avoid potential problems, do […]
Continue reading...January 20, 2020 Andy Wyenandt
Understanding The Differences Between FRAC Group 11 and FRAC Group 3 Fungicides
FRAC Group 11 Fungicides The strobilurin, or QoI fungicides (FRAC group 11) are extremely useful in controlling a broad spectrum of common vegetable pathogens. You may know some of strobilurins as azoxystrobin (Quadris), trifloxystrobin (Flint), pyraclostrobin (Cabrio), or Pristine (pyraclostrobin + boscalid, 11 + 7). For example, FRAC group 11 active ingredients such as azoxystrobin […]
Continue reading...January 19, 2020 Andy Wyenandt
Damping-off: Identifying and Controlling Pathogens in Transplant Production
It is extremely important to know which pathogen is causing damping-off problems and which fungicide to properly apply. The key to controlling damping-off is being proactive instead of reactive. Always refer to the fungicide label for crop use, pathogens controlled, and application rates. Damping-off is caused by a number of important vegetable pathogens and is […]
Continue reading...January 18, 2020 Andy Wyenandt
Cucurbit Powdery and Downy Mildew: A Tale of Two Pathogens
Cucurbit powdery and downy mildew are two important pathogens of cucurbit crops throughout the mid-Atlantic region. 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. Its important for growers to remember that each pathogen belongs to […]
Continue reading...January 15, 2020 Andy Wyenandt
Greenhouse Disease Management: Seed Treatments and Transplant Production
Seed Treatment Seed used in transplant production should be certified ‘clean’ or disease-free. Most commercial seed comes with certification and is pretreated with fungicide. Important diseases such as Bacterial leaf spot of tomato and pepper can cause major problems in transplant production if introduced in the greenhouse, especially if untreated seed is infested. Remember, a […]
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