Midwest Vegetable Guide - 2022 - 125

Cucurbit Crops - Diseases
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: 0day.
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,
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,
Midwest Veg Guide 2022
125
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: 0day.
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.
http://www.edustore.purdue.edu/
Midwest Vegetable Guide - 2022

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