Symptoms
The leaves, petioles, stems, and fruits can all be affected, but leaf damage is the main reason. The leaves suffer damage, often forming white or irregular white lesions on the back of the leaves. The mildew often covers the entire back of the leaves. The lesions fuse with each other, and the colors turn grayish purple or dark green. The front of the victim's blade gradually turned green and yellow as the lesions on the back expanded, causing the entire leaf to be yellow, and the front was also mildly mild. The leaves of the plant appear curled from bottom to top, appearing yellow and brown and dry. The incidence of fruit mostly surrounds the fruit pedicles and forms a black hard spot that slightly sinks downwards.
Control methods
1. Agricultural control. Before sowing, the seeds were soaked in warm water of 53°C for 30 minutes, dried and germinated. Selection of resistant varieties such as Shuangkang 2, Jiahong, Jiafen, Zhongshe 4 and Shenfen 3, etc. Severe disease fields should be implemented in 3-4 years rotation with Solanaceous Vegetable Fields. Apply more organic fertilizer, increase phosphorus, potassium fertilizer, improve plant resistance. Pay attention to timely drainage in the rainy season, reduce the humidity in the field, so that it is not conducive to pathogen infection.
2. Chemical control. Leaf spray 70% thiophanate-methyl WP 800 times, or 50% acetaminophen wettable powder 1500-2000 times, or 75% chlorothalonil WP 600 times, spray every 7 days 1 Times, even spray 3-4 times, about 50 kg per mu of liquid medicine. The above agents are preferably used alternately so as not to produce drug resistance.
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