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2022 Midwest Vegetable Guide

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Cucurbit Crops – Diseases Midwest Veg Guide 2022 131 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. Flint Extra (4.05) (trifloxystrobin) Pumpkin, Squash | 2.0- 3.8 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 11. 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. 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. Quadris Top (SC) (azoxystrobin, difenoconazole) Cantaloupe/Muskmelon, Cucumber, Watermelon | 12-14 fl. oz. per acre. REI: 12-hour. PHI: 1-day. FRAC 11, FRAC 03. Leaf Spot and Fruit Spot of Cucurbits - Xanthomonas Bacteria Bacterial leaf and fruit spot, caused by Xanthomonas cucurbitae, occurs primarily on pumpkin and winter squash. Symptoms on leaves may occur from the 4-leaf stage through the remainder of the season. Fruits can be infected from time of set until ripen (colored). Only fruit symptoms are of economic importance. Bacterial leaf and fruit spot lesions may be colonized by other organisms (such as Fusarium and soft-rot bacteria), which results in fruit rot. The bacterial leaf and fruit spot pathogen can survive on infected leaf and fruit residues for more than 24 months. Also, the pathogen has been detected on and in seed for longer than 20 months from harvest. The pathogen may move from infected seed to seedling. The bacterium can survive on leaves without showing any symptoms. Leaf symptoms of this disease may be similar to angular leaf spot caused by Pseudomonas bacterium. The only known hosts of the leaf spot pathogen (Xanthomonas) are plants in the Cucurbitaceae family. However, bacterial spots developed on leaves of inoculated bur cucumber (Sicyos angulatus) and velvetleaf (Abutilon theophrasti) weeds in greenhouse inoculations. At planting, treat with fixed copper compounds mixed with mancozeb products if symptoms are present. At vine touch, apply fixed copper mixed with mancozeb when fruit is softball-sized. Continue applications until fruit ripening. Non-Pesticide Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Use pathogen-free seed and disease-free transplants. Hot water treatment at 131 F for 15 minutes eradicates the bacteria on and in the seed. Rotate to non- Cucurbit crops for 3 years. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important practice to minimize pathogen survival with plant debris. 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. Nematodes Winter/off-season: Root-knot nematodes have a host range of more than 2,000 plants, so crop rotation is often ineffective unless a grain crop is used. Certain cover crops may lessen symptom severity. Planting: Vydate at planting may manage moderate nematode populations. Fumigants may be used for higher nematode populations. Harvest: Examine stunted and wilting plants for the presence of root-knot nematodes. Non-Pesticide Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Collect soil samples for nematodes in the fall and avoid fields with high numbers. Rotate to a non-broadleaf crop, such as grass grains or sweet corn for >3 years. Prompt destruction of the finished crop with tillage to rapidly

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