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The leaves begin to turn brown at the margins and necrosis progresses towards the base of the leaf. [2] Cankers, which may or may not have black spots, may appear in the epidermal cortical tissue and on the stems of infected plants. Black spots, if visible, are pycnidia and/or perithecia. Black rot is a common symptom on the fruit of gummy stem ...
Didymella bryoniae, syn. Mycosphaerella melonis, is an ascomycete fungal plant pathogen that causes gummy stem blight on the family Cucurbitaceae (the family of gourds and melons), which includes cantaloupe, cucumber, muskmelon and watermelon plants.
Small water-soaked lesions, maturing into sunken and brown spots with or without a yellow halo. May show concentric rings with purple margins. Necrotic tissue may fall out to appear shot-holed. Leaf spot on many plants and crops. Septoria: Small brown spots, that turns light tan to white in the centre. Leaf spot on many crops Bipolaris
Citrus Black Spot has a large economic impact on many countries because the black blemishes make it undesirable for human consumption and therefore the infected fruit cannot be sold. This type of economic impact is felt most in Australia and South Africa where the disease has been present for a number of years. [ 37 ]
Halo blight causes small water-soaked spots on leaves. These spot progressively turn dark brown and are surrounded by a wide greenish yellow halo. The necrotic spots remain small unlike that of common blight. [4] Similar to foliage symptoms, halo blights causes water-soaked spots on vegetative pods. It also causes streaks along pod sutures.
Diabrotica undecimpunctata howardi – spotted cucumber beetle or southern corn rootworm [4] Diabrotica undecimpunctata tenella – western cucumber beetle [5] Diabrotica undecimpunctata undecimpunctata – western spotted cucumber beetle [6] In the adult form, it eats leaves of many crops, including squash, cucumbers, soybeans, cotton, beans ...
The younger larvae are thin white caterpillars with numerous small black spots. As the larvae mature they become plump and darker in color and they lose their spots. The larvae tuck themselves into crumpled dead leaves to pupate for 8 to 10 days. The life cycle varies by environmental conditions ranging from 22 to 55 days.
Acalymma vittatum, the striped cucumber beetle, is a beetle of the family Chrysomelidae and a serious pest of cucurbit crops in both larval and adult stages. The striped cucumber beetle has a distinctive appearance, displaying a yellow-colored elytra with black stripes.