This is a disease that appears whenever we have a hot and humid summer. Vegetables most affected include cucumbers, muskmelons and watermelons. This year, cucumbers seem to be most impacted this year. Squash and pumpkin are not attacked.
Look for brown to black lesions on the leaves that my disintegrate resulting in a tattered appearance to the leaves. There may also be elliptical lesions on the stems and leaf petioles. During wet weather, these lesions may be covered with a pink to buff-colored spor mass.
Crop rotation can help prevent the disease as can the use of clean seed. Crop rotations should be a minimum of 3 to 4 years long to prevent carryover of disease spored from crop debris. Periodic
fungicide applications may be necessary during wet weather in mid-summer. Apply chlorothalonil (Bonide Fungonil Concentrate, Daconil, Ortho Garden Disease Control, Fertilome Broad-Spectrum Landscape and Garden Fungicide, others) or mancozeb (Bonide Mancozeb Flowable). (Ward Upham)
Look for brown to black lesions on the leaves that my disintegrate resulting in a tattered appearance to the leaves. There may also be elliptical lesions on the stems and leaf petioles. During wet weather, these lesions may be covered with a pink to buff-colored spor mass.
Crop rotation can help prevent the disease as can the use of clean seed. Crop rotations should be a minimum of 3 to 4 years long to prevent carryover of disease spored from crop debris. Periodic
fungicide applications may be necessary during wet weather in mid-summer. Apply chlorothalonil (Bonide Fungonil Concentrate, Daconil, Ortho Garden Disease Control, Fertilome Broad-Spectrum Landscape and Garden Fungicide, others) or mancozeb (Bonide Mancozeb Flowable). (Ward Upham)
RSS Feed
