Melon disease has always caused melon headaches, and the disease has seriously affected the quality and yield of melon. China Pesticide Network Xiaobian gives you the trick: Gate Valve,Sluice Valve,Knife Gate Valve,Brass Gate Valve Zhejiang minmetals huitong import and export Co., Ltd , https://www.zjminmetals.com
I. Symptoms of mosaic disease: In the early stage of the disease, the leaves appear yellow-green and dense green inlaid spots, the leaves become smaller, the leaves are shrunk, uneven, and curled. The vines are twisted and shrunk, the plants are dwarfed, the melons are small, and the fruit surface has a dense and faint mottled or slightly bulging bulge.
Control methods: (1) Mainly cultivated and disease-preventing, timely killing cockroaches. (2) Seed treatment, soaking in 55-degree warm water for 20 minutes, then moving to cool water to cool, then germination and sowing. (3) Cultivate strong seedlings and plant them at appropriate intervals. Farming operations such as pruning and pollination do not touch the leaf vines to prevent contact with infection. (4) Formulated fertilization technology to improve disease resistance. (5) It was found that the aphids sprayed 20% of the virus A wettable powder 500 times in time.
Second, the symptoms of leaf blight: mainly damage the leaves. When the true leaf infection first appeared brown spot, the lesion gradually expanded, the edge slightly bulged, the boundary of the diseased area was obvious, but the wheel pattern was not obvious, the edge was water-soaked, and several lesions merged into large spots, causing the leaves to dry up. The fruit is infected, and the symptoms are similar to those of the leaves. The bacteria can invade the flesh and form fruit rot.
Pesticide control methods: (1) use disease-free melons to keep seeds. Seeds were seeded with 0.3% 75% chlorothalonil wettable powder or 50% chlorhexidine wettable powder. (2) Rotation of crops, not continuous with cucurbit crops. (3) Strengthen cultivation management, increase the application of organic fertilizer, and improve the disease resistance of plants. Prevent flooding of large water, and early detection of diseased leaves should be removed in time or buried. (4) Spray with 75% chlorothalonil WP 600 times or 50% phlegm WP 1500 times, 50% keering WP 1500 times, spray once every 7-10 days. Spray even 2-3 times.
3. Symptoms of anthracnose: The seedlings are infected with water-soaked lesions on the stems near the ground. The lesions on the leaves are nearly round, yellow-brown or red-brown, with yellow halos on the edges; stems and petiole are infected, and the disease is slightly The sag is oblong; the fruit is infected, the diseased part is cracked, and the pink viscous material overflows when the humidity is high.
Control methods: (1) Rotation with non-melon crops for more than 3 years (2) Pesticide network recommendation, use 75% chlorothalonil WP 800 times solution or 50% thiophanate-methyl WP 800 times solution .
Supporting the main diseases of melon