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2022 Midwest Vegetable Guide

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Cucurbit Crops – Diseases Midwest Veg Guide 2022 125 Cucurbit Crops – Diseases Reviewed by Dan Egel, Mohammad Babadoost – Sept 2021 Recommended Controls Angular Leaf Spot of Cucurbits - Pseudomonas Bacteria Angular leaf spot may be seedborne. Lesions on leaves and fruit of pumpkin and squash are similar in appearance to those of Xanthomonas bacterial leaf and fruit spot. Non-Pesticide Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Use disease-free seed and transplants. Resistant cucumber varieties are available. Rotate to non-cucurbit crops at least 2 years. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Pesticide copper products (copper hydroxide, copper octanoate, copper oxychloride, copper sulfate, copper diammonium diacetate complex, cuprous oxide) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Copper products (copper hydroxide, copper octanoate, copper oxychloride, copper sulfate, copper diammonium diacetate complex, cuprous oxide) mixed with mancozeb products (Dithane, Manzate, Penncozeb) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Several formulations of copper (Badge, Champ, Kocide) are labelled for use. See label for directions. Apply fixed copper 2 weeks prior to the opening of the first female bloom until fruit maturity. , at first female bloom, and 2 weeks after the first female bloom. Later in the season, fixed copper products may be applied to help reduce disease spread. No more than 6 applications per season. See labels for directions. REI: 4 to 48-hour. PHI: 0- day. FRAC M01. OMRI-listed. Anthracnose of Cucurbits - Colletotrichum Fungus Race 1 of this fungal pathogen that causes anthracnose affects mainly cucumber and melon; many watermelon varieties are resistant to Race 1. Race 2 affects mainly watermelon. Lesions of this disease may be observed from transplant stage through harvest on leaves, stems, and fruit. May be seedborne. At vine touch, at 7-14 day intervals or according to MELCAST - see Purdue Extension publication BP-67-W, Foliar Disease Fungicide Control Using MELCAST, available from the Purdue Extension Education Store, edustore.purdue.edu . Non-Pesticide Cantaloupe/Muskmelon, Cucumber, Watermelon | Use disease free seed and transplants. Rotate to a non-Cucurbit crop for 2 years. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important practice to prevent disease build-up. Pesticide Aprovia Top (difenoconazole, benzovindiflupyr) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 10.5-13.5 fl. oz. per acre. REI: 12-hour. PHI: 0- day. FRAC 03, FRAC 07. azoxystrobin products (azoxystrobin) Cantaloupe/Muskmelon, Cucumber, Watermelon | Use 2 lb. a.i. per gallon formulations (Quadris) at 11-15.5 fl. oz. per acre. Use 3.3 lb. per gallon formulations (Azteroid) at 3.9-9.7 fl. oz. per acre. Use 0.5 lb. per gallon formulations (Heritage) on greenhouse transplants only at 0.08-0.18 oz. per 1,000 sq. ft. REI: 4-hour. PHI: 1-day. FRAC 11. Cabrio EG (20) (pyraclostrobin) Cantaloupe/Muskmelon, Cucumber, Watermelon | 12-16 oz. per acre. REI: 12-hour. PHI: 0-day. FRAC 11. chlorothalonil products (chlorothalonil) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See label for directions. REI: 12-hour. PHI: 0-day. FRAC M05. Inspire Super (EW) (difenoconazole, cyprodinil) Cantaloupe/Muskmelon, Cucumber, Watermelon | 16-20 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 03, FRAC 09. Luna Sensation (fluopyram, trifloxystrobin) Cantaloupe/Muskmelon, Cucumber, Watermelon | 7.6 fl. oz. per acre. REI: 12-hour. PHI: 0-day. FRAC 07, FRAC 11. mancozeb products (mancozeb) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Several formulations of mancozeb products (Dithane, Manzate, Penncozeb) are labeled at various rates. See label for directions. REI: 24-hour. PHI: 5-day. FRAC M03. Merivon (fluxapyroxad, pyraclostrobin) Cantaloupe/Muskmelon, Cucumber, Watermelon | 5.5 fl. oz. per acre. REI: 12-hour. PHI: 0-day. FRAC 07, FRAC 11. Orondis Opti Premix (SC) (oxathiapiprolin, chlorothalonil) Cantaloupe/Muskmelon, Cucumber,

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