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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]
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.
Overall, infection of the crop will produce small chlorotic spots on the leaves, stems, and/or cotyledons, which turn brown while enlarging in size. The necrotic lesions can cause death to the plant structure and plant as a whole. MNSV symptoms tend to be more severe at lower temperatures.
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The watermelon is an annual that has a prostrate or climbing habit. Stems are up to 3 metres (10 feet) long and new growth has yellow or brown hairs. Leaves are 60 to 200 millimetres (2 + 1 ⁄ 4 to 7 + 3 ⁄ 4 inches) long and 40 to 150 mm (1 + 1 ⁄ 2 to 6 in) wide. These usually have three lobes that are lobed or doubly lobed.
Watermelon mosaic virus (WMV) also known as Marrow mosaic virus (Raychaudhuri and Varma, 1975; Varma, 1988), Melon mosaic virus (Iwaki et al., 1984; Komuro, 1962), and until recently Watermelon mosaic virus type 2 (WMV-2), [1] is a plant pathogenic virus [2] that causes viral infection (sometimes referred to as watermelon Mosaic disease) in many different plants.
Annona squamosa is a small, well-branched tree or shrub [7] from the family Annonaceae that bears edible fruits called sugar apples or sweetsops. [8] It tolerates a tropical lowland climate better than its relatives Annona reticulata and Annona cherimola [6] (whose fruits often share the same name) [3] helping make it the most widely cultivated of these species. [9]
Solanum citrullifolium is a species of flowering plant in the Solanaceae family. [2] It is a nightshade referred to by the common name watermelon nightshade, [3] as its leaves somewhat resemble those of a watermelon plant. It is a white-stemmed shrub with purple star-shaped flowers.