Perforated brown spot symptoms and onset of symptoms: Infestation began in early May, the size of the needles on the leaf surface was purplish, followed by a brownish brown spot, 1-5 mm in diameter, and the center became light brown with brown edges. red. The posterior diseased part is dry and contracted, and the surrounding layer produces an off-layer, often falling off as brown perforation. The edge is not obvious. There are black spots on the spot, ie the ascospora or the base of the conidiophore, which is different from bacterial perforation. The disease is the most serious from July to August. Control methods: Drain the water in time, cut out the paper that affects the light, and enhance the ventilation and light transmission between the lines. Spraying sterilization 2000-3000 times liquid, Fuxing 6000-8000 times liquid. Painlessly Silicone-Faced Dressing,Silicone-Faced Dressing,Comfortable Silicone-Faced Dressing,Flexible Silicone-Faced Dressing Zhende Medical Co.,Ltd , https://www.zhendemedicals.com