First, pathogens and symptoms
The pathogen of cucumber black spot disease is the fungus and the fungus Cladosporium subsp. Its pathological characteristics are that cucumbers can be infected during the entire growth period, and leaves, stems and melons can be affected. At the onset of seedlings, cotyledons showed yellow-white near-circular spots, and the cotyledons rotted after expansion, and the seedlings stopped growing. When the seedlings were severe, the heart was withered and the whole plant died. When the young seedlings are onset, the exposed true leaves rot and form double-headed and multi-seedlings. At the onset of the leaf blade, a nearly circular green spot was formed on the leaf blade, which expanded to a yellow-white round spot with a diameter of 2 to 3 mm. A crack was formed at the edge of the later stage of the lesion to form a perforation. The perforation edge of the lesion was star-shaped. And leave a yellow-white circle. When the leading disease occurs, the whole growing point is wilting, browning and rotting. When petiole, melon vine and stalk were onset, pale fuschia-shaped lesions of varying sizes appeared in the mid-brown. The middle part of the disease was sag and subsidence. The diseased part showed white discharge and became amber-like jelly. When it was wet, the lesions appeared. Growing out of the gray mold layer. When the melon strips are onset. At the beginning, dark green round or elliptic lesions were produced, and there was a spill of jelly, which later became amber. Commonly referred to as “oilâ€, the lesions were 2 to 4 mm in diameter, and when air was dry, the depressions and cracks were scab-like. The diseased tissue organization stopped growing, resulting in malformed melon strips. When the humidity was high, the gray mold layer was visible and the melon strips were generally not bad. Juvenile melons, melons can be the disease, young melons most susceptible to disease.
Second, comprehensive prevention and control measures
Adhere to the "prevention-based, comprehensive prevention and control" plant protection policy. 1 Strengthen quarantine and prevent the spread of disease. 2 Select disease-resistant varieties and disease-free seeds and conduct seed treatment. Disease-resistant varieties: such as green hybrid 1, 2nd. 2 to strengthen the cultivation and management measures. In the case of constant plantings per unit area, increase the row spacing between the two stands and narrow the plant spacing, which can improve the ventilation and light transmission between plants and reduce the temperature. 4 chemical control. At the beginning of the disease, 40% Fuxing Emulsion 8000 times, or 75% chlorothalonil WP 800 times, or 50% acetaminophen WP 1500 times, or 45% chlorothalonil smoke agent per acre 250 grams of smoke each time. The spraying should be even and thoughtful, the young part and the growth point should be sprayed, spraying once every 5 to 7 days, continuous control 3 to 4 times.
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