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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.
Symptoms on watermelon and cantaloupe are different from on other cucurbits; leaf spots are typically not angular and turn brown to black in color. Often, an exaggerated upward leaf-curling will occur. Regardless of which cucurbit is involved, only the leaves are infected, not fruit, flowers, stems or roots.
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.
As the leaves develop, they become increasingly distorted, and ultimately thick and rubbery compared to normal leaves. The color of the leaves changes from the normal green to red and purple, until a whitish bloom covers each leaf. Finally, the dead leaf may dry and turn black before it is cast off. Changes in the bark are less noticeable, if ...
It is a herbaceous perennial plant growing to 40–100 cm tall, with alternate, oblong-lanceolate leaves 5–14 cm long. The greenish-white flowers hang from axils on 1–2 cm thin kinked pedicels, each flower with six white tepals , 9–15 mm long.
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Citrullus is a genus of seven species of desert vines, among which Citrullus lanatus (the watermelon) is an important crop. Taxonomy. Molecular data, ...