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Gummy stem blight is a cucurbit-rot disease caused by the fungal plant pathogen Didymella bryoniae (anamorph Phoma cucurbitacearum). [1] Gummy stem blight can affect a host at any stage of growth in its development and affects all parts of the host including leaves, stems and fruits. [1]
On adult leaves, the symptoms appear the same as the ones left by other abiotic or biotic stressors so diagnosis is not as straight forward. They include large irregular leaf lesions which are brown to black in watermelon and reddish brown in melon. Bacterial fruit blotch lesions spread along main midrib in adult leaves. [5]
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.
In May 1983, some plants showed chlorosis and occasional necrotic spots on leaves. By August of that year, nearly 50% of the 120,000 plants in the greenhouse were severely infected and over 60% had MNSV by October. Fortunately the fruits of these plants did not display any symptoms although there was definite reduction in crop yield. [13]
Leaf spots start out small and become water soaked, and as time progresses may enlarge turn tan and crack. Blighting of new leaves may also take place. The fruit of the pepper is infected through the stem giving way to water soaked areas on the fruit that are overgrown by signs of the pathogen which appear as, "white-gray, cottony, fungal -like ...
Cucumis myriocarpus has many small fruit, hidden under the leaves. The fruit are smaller than a golf ball and green in colour, developing to yellow on maturity. The larger melons commonly seen on roadsides in rural Australia are in fact Citrullus lanatus, a wild relative of the watermelon.
Rhizoctonia solani root rot on corn roots, magnified 0.63X. Damping off can be prevented or controlled in several different ways. Sowing seeds in a sterilized growing medium can be effective, although fungal spores may still be introduced to the medium, either on the seeds themselves or after sowing (in water or on the wind).
Cercospora leaf spot Cercospora citrullina: Charcoal rot. Vine decline and fruit rot Macrophomina phaseolina: Choanephora fruit rot Choanephora cucurbitarum: Collapse of melon Monosporascus eutypoides = Bitrimonospora indica. Corynespora blight/target spot Corynespora cassiicola: Crater rot (fruit) Myrothecium roridum: Crown and foot rot ...