Cucurbit Crops Pest Identification
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1 Cucurbit Crops Pest Identification Indicates very common pests
2 Powdery mildew: white spots and growth, especially on underside of leaves, dries out stems
3 Downy Mildew: square-ish yellow or brown leaf spots/dark fuzz below/curling, wilting leaves
4 Cucurbit Pests Photo by R. Wick, UMass Black rot: black or brown spots with rings = gummy stem blight: gummy droplets leaking from vines
5 Cucurbit Pests Photo by R. Wick, UMass Photo by R. Wick, UMass Plectosporium blight: white, diamond-shaped lesions on vines/round on fruit & leaves/kills vines
6 Phytophthora blight: flour-like growth on fruit or vines, fruit rot, vines collapse and die
7 Photo by R. Wick, UMass Scab: White spots on leaves, sunken spots on fruit Cucurbit Pests
8 Photo by W. Elmer, CAES Fusarium crown and fruit rot: brown and white, sunken spots on fruit/brown stems
9 Sclerotinia fruit rot: white growth like shavingcream with large dark resting spores
10 Alternaria leaf spot: tan or black leaf spots on older foliage. Spots may develop concentric rings Cucurbit Pests
11 Anthracnose: brown or tan leaf spots on cucumbers/ sunken stem lesions with tan spores/round, sunken, dark fruit lesions, often with salmon-colored spores Cucurbit Pests Photos by R. Wick, UMass
12 Photo by R. Wick, UMass Bacterial wilt: plants wilt and die/leaves have water-soaked areas between veins/bacteria shown streaming out of cut stem
13 Angular leaf spot: irregular to angular shaped spots, tissue turns dark and tears
14 Photos by M. McGrath, Cornell University Bacterial leaf spot: fruit spots with soft, brown halo/leaf spots white with yellow halo
15 Cucurbit yellow vine: yellow leaves/brown tissue in stem, spread by squash bugs
16 Photo by R. Wick, UMass Virus: distorted leaves and fruit (shape and/or color)
17 Sun scald: large pale area facing sun, may turn black as fungus attacks dead tissue
18 Photo by J. Howell, UMass Aborted fruit: due to lack of pollination, small fruit turn brown at blossom end and eventually drop off plant
19 Drought damage: dead tissue on leaf margins
20 Ozone damage: interveinal clearing
21 clomazone herbicide injury: young foliage turns white, ethalfluralin turns them yellow
22 Striped cucumber beetle: yellow and black stripes/ defoliates seedlings/scars fruit/spreads bacterial wilt Photo by R. Durgy, CAES Cucurbit Pests
23 Photo by D. Ferro, UMass Spotted cucumber beetle: larger leaf holes
24 Flea beetles: small, dark beetles that jump like fleas/ make small pits or holes in leaves
25 Photo by R. Durgy, CAES Squash bugs: eggs brown/nymphs grey and soft/adults hard and brown/leaves and plants wilt, spreads cucurbit yellow vine
26 Squash vine borer: day-flying orange and black moth /large white larvae/bore into vines, vines may wilt
27 Squash beetles: large, orange ladybug/larvae yellow with black bristles/circular, lacey, leaf holes/spiral scars on fruit
28 Melon aphids: small, dark, pear-shaped, with dark tail pipes. Usually found on underside of leaves
29 Spring tails: small, dark, wingless, jump like fleas/make pits and small holes in seedling leaves
30 Ground hog damage: shallow scaring of fruit
31 Deer damage: deep holes in fruit, eat flesh and seeds
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