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Pseudoperonospora cubensis is a species of water mould known for causing downy mildew on cucurbits such as cantaloupe, cucumber, pumpkin, squash and watermelon. This water mould is an important pathogen of all these crops, especially in areas with high humidity and rainfall, such as the eastern United States.
Cucumber mosaic virus (CMV) is a plant pathogenic virus [1] in the family Bromoviridae. [2] This virus has a worldwide distribution and a very wide host range, [ 3 ] having the reputation of the widest host range of any known plant virus. [ 4 ]
Fungal diseases; Alternaria leaf blight Alternaria cucumerina: Alternaria leaf spot Alternaria alternata f.sp. cucurbitae. Anthracnose (stem, leaf and fruit) Colletotrichum orbiculare = Colletotrichum lagenarium Glomerella lagenarium [teleomorph] Belly rot Rhizoctonia solani Thanatephorus cucumeris [teleomorph] Black root rot Thielaviopsis basicola
Cucumber leaves afflicted with various stages of Cucumber mosaic virus. A mosaic virus is any virus that causes infected plant foliage to have a mottled appearance. Such viruses come from a variety of unrelated lineages and consequently there is no taxon that unites all mosaic viruses.
The virus affects the young leaves with green and light green spots, even yellow-green spots. These spots have a slower development rate than the rest of the leaf. Sometimes the veins remain green. In heavy infection young leaves are even deformed. The activity of the virus is reduced when the leaf ages. Fruit drop (abortion) is common.
Squash mosaic virus (SqMV) is a mosaic virus disease common in squash plants and other plants, including melons, of the family Cucurbitaceae. [1] It occurs worldwide. [1] It is transmitted primarily by beetles, including the leaf beetle (Acalymma trivittata), spotted cucumber beetle (Diabrotica undecimpunctata), [2] [3] and 28-spotted ladybird beetle (Henosepilachna vigintioctopunctata), [1 ...
Symptoms can overlap across causal agents, however differing signs and symptoms of certain pathogens can lead to the diagnosis of the type of leaf spot disease. Prolonged wet and humid conditions promote leaf spot disease and most pathogens are spread by wind, splashing rain or irrigation that carry the disease to other leaves. [2]
Purple leaf sheath Hemiparasitic bacteria and fungi Pyrenochaeta stalk rot and root rot Phoma terrestris = Pyrenochaeta terrestris: Pythium root rot Pythium spp. Pythium arrhenomanes Pythium graminicola. Pythium stalk rot Pythium aphanidermatum = Pythium butleri: Red kernel disease. Ear mold, leaf and seed rot Epicoccum nigrum: Rhizoctonia ear ...