In the past two years, I discovered that people have a misunderstanding in the process of planting peanuts. That is, in the late growth period of peanuts, the leaves often have brown spots, and they think that they should harvest them soon and they will no longer be able to prevent and control them. In fact, this view is wrong, because peanuts are full of fruit during the late growth period, long spots on the leaves affect photosynthesis, is not conducive to peanut full of nuts, will affect production, prevention and control should be strengthened. Since August, there have been continuous rainy weather in our country. Humidity in the fields and the air is relatively high, which can easily cause crop diseases. Recently, I discovered that brown, round, star-shaped reticulate lesions were found on the leaves of peanuts and were identified by the field and were damaged by peanut net spot disease. Peanut net blotch is caused by peanut stem mold, belonging to the fungus Subgeronia spp., which usually occurs in the middle and late stages of peanut growth. When the humidity in the field is high, it is easy to develop. The general year of the disease can reduce the production of peanuts by 10% to 20%, and reduce the production of severe diseases by 30% to 40%. Peanut net spot mainly damages peanut leaves, followed by stems and petioles. The lesion first appeared on the bottom leaf of the plant. In the early stage of the disease, there was a light brown dot or stellate mottled small spot on the front of the leaf. As the disease developed, it gradually formed a large brown to dark brown round spot, and the edge was reticularly unclear. , Rough surface, uneven coloration. The stems and petioles were infected, and the primary brown dots were later expanded into oval or elongated lesions with slight depressions in the center. Severe stems and leaves can cause dead. 70% thiophanate-methyl WP can be used for prevention and treatment 600 to 800 times or 10% difenoconazole water dispersible granules 1000 to 1500 times, plus love more than 6000 times liquid evenly spraying, 5 Spray once every 7 days for 2 to 3 times.
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