Summer spot blotch is also called summer spot spot and summer spot. It is a serious disease that occurs on the cold-season turf in summer when it is hot and humid, especially on the grass that grows densely on the Kentucky bluegrass. It mainly causes spotted macules of varying sizes. At the beginning of the summer, symptoms began to appear. The turf began to appear as a ring of small lesions. Afterwards, the turfgrass became blight yellow, and the ring-shaped wilt disease block appeared. It gradually expanded and reached a diameter of 40cm and a maximum of 80cm. On the general lawn, the lesion began to disperse with yellowish spots, and the roots turned dark brown and the whole plant died. The pathogen of summer spot blotch is at 21. Can infect C-35~C. In the beginning, the bacteria infected only the roots, and when it was hot and rainy in summer and sustained high temperatures, the diseases would quickly occur, resulting in bald patches of varying sizes on the lawn. Blight grass in the lesions could not be restored. Drought has little effect on the disease.
Prevention:
(1) Scientific fertilization According to turfgrass habits, reasonable application of N, P, K fertilizer, control the amount of N fertilizer, increase the proportion of organic fertilizer application. Reapply autumn fertilizer, light spring fertilizer. Fertilizer should be applied sparingly and balancedly.
(2) Reasonable irrigation to avoid flooding and string irrigation, reduce the number of irrigation, control the amount of irrigation, and maintain a good drainage function on the ground, so that the lawn is neither dry nor wet. The best irrigation time is in the early morning or late afternoon and avoid watering in the evening or night.
(3) Drug control: At the beginning of the disease, 50% mancozeb 600 to 800 times and 70% thiophanate-methyl 800 times were uniformly sprayed.
Prevention:
(1) Scientific fertilization According to turfgrass habits, reasonable application of N, P, K fertilizer, control the amount of N fertilizer, increase the proportion of organic fertilizer application. Reapply autumn fertilizer, light spring fertilizer. Fertilizer should be applied sparingly and balancedly.
(2) Reasonable irrigation to avoid flooding and string irrigation, reduce the number of irrigation, control the amount of irrigation, and maintain a good drainage function on the ground, so that the lawn is neither dry nor wet. The best irrigation time is in the early morning or late afternoon and avoid watering in the evening or night.
(3) Drug control: At the beginning of the disease, 50% mancozeb 600 to 800 times and 70% thiophanate-methyl 800 times were uniformly sprayed.
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