What causes zucchini plant death?
What causes zucchini plant death? How should it be prevented and controlled? The cause of zucchini plant death is very likely gummy stem blight, which mainly damages the leaves and stems, followed by the fruit. When leaves are affected, nearly round or irregular lesions appear, and sometimes the lesion extends inward from the leaf margin in a "V" shape or as a large semicircular lesion, ranging from light brown to...
What causes zucchini plant death? How should it be prevented and controlled?
The cause of zucchini plant death is very likely gummy stem blight, which mainly damages the leaves and stems, followed by the fruit. When leaves are affected, nearly round or irregular lesions appear, and sometimes the lesion extends inward from the leaf margin in a "V" shape or as a large semicircular lesion, ranging from light brown to yellow-brown; in the later stage the lesions tend to rupture, the concentric rings on the lesions are not obvious, and many small black dots are scattered over the surface of the lesions. When stems are affected, it mostly occurs at or near the nodes, beginning as oil-soaked spots that are elliptical or spindle-shaped, slightly sunken, grayish white to dark brown, and exuding amber-colored gummy material. After drying, they turn reddish brown, the diseased part shrinks and splits lengthwise, and a large number of small black dots are scattered over the surface; in severe cases, this can cause the stem to rot. When the fruit is affected, the flesh turns light brown.
Prevention and control methods: For chemical control, in the early stage of the disease, spray 70% thiophanate-methyl wettable powder at 500-600 times dilution, or 40% Xinxing emulsifiable concentrate at 10000 times dilution, once every 4-5 days, for 3-4 consecutive sprays.
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