Home-grown tomatoes are one of the greatest pleasures of summer, but they are at risk. Along with potatoes.
Late blight infection, affecting the two crops, was reported in Litchfield County on July 18, and UConn is sending out an alert.
With moist weather, the pathogen, Phytophthora infestans, will spread rapidly on wind currents. Fungicides can be applied preventively to protect plants.
Active ingredients to look for include chlorothalonil, maneb, mancozeb, and copper formulations. Organic growers can use copper formulations.
Symptoms of late blight include large brown leaf lesions, dark brown stem lesions, and brown, bumpy and firm lesions on fruits. During humid or wet weather, white spores will be visible within the lesions.
Infected plant parts or plants should be removed and disposed of. Bag and place in the trash or bury about a foot deep.
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