Cucumber brown spot mostly starts from the cucumber melon period, and the middle and lower leaves begin to develop and develop upward. At the beginning, small gray-brown spots appeared on the leaves and gradually expanded into unequal round or near-circular edges of light brown or brown spots of unequal size. The lesions are mostly 8 to 15 mm in diameter, 3 to 5 mm in size, and 20 to 25 mm in size. The lesions in the middle of the lesions become lighter, sometimes grayish and grayish brown on the edges. When the humidity is high, sparse grayish-brown moulds are sparse on the front and back of the lesion. Sometimes the lesions fuse and the leaves are yellow. When the disease is heavy, oval taupe lesions appear on stems and petioles.
Control methods:
1 seed disinfection
When grafting cucumbers and squash, it is important to note that the seeds of the squash also need to carry no bacteria. Soak cucumber seeds and grafted black seed pumpkin seeds for 30 minutes with warm water at 55°C.
2 Agricultural measures
Onset fields should be rotated for more than two years with non-melon crops. Thoroughly remove the sick plants in the field and deep-deep the soil in order to reduce the source of field infestation. Apply enough basal fertilizer, timely fertilizer, avoid partial nitrogenous fertilizer, increase phosphorus and potassium fertilizers, apply appropriate amount of boron fertilizer. To prevent the premature decline of cucumber plants, pay attention to exhalation after watering, remove diseased leaves in the early stages of disease.
3 Chemical control
In the early stage of disease, 75% chlorothalonil WP can be used in time, 500% of 70% Mancozeb WP, or 50% WP WP can be added 65% zeocin WP (1: 1) 500 times, or 75% chlorothalonil wettable powder plus 70% carbendazim wettable powder (1:1) 500 times, or 75% chlorothalonil wettable powder plus 50% fastinking wettability Powder (1:1) 1000 times liquid and other agents spray, once every 7 days, continuous control 2 to 3 times.
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