The Harmfulness and Prevention of Tea Yellow Tea
2021-09-04 13:04:16
Ophiopogon larvae are small and invisible to the naked eye, but breed rapidly. At 28-32°C, they reproduce for 1 generation in 4-5 days. At 18-20°C, 7-10 days for 1 generation, 1 year can occur. 25 Generation around. Mainly in the greenhouse greenhouse propagation hazards, the site of damage to the top of the plant leaves, when the young leaves grow old, that is, from the old leaves to new leaves, it is also known as "green leafhopper." After the leaves were damaged, the back turned brown with oily, distorted deformity, and severe dry top. After flower and fruit damage, it does not bloom, does not bear fruit, the peel is yellow-brown, corked, and cracked. Control methods: Use 73% of Krypton 1000 times solution, or 25% extinguishment Manganese wettable powder 1000-1500 times solution, or 10% DDP 3000 times solution, spray once every 5-7 days, even Spray 2-3 times. In addition, after harvesting the former crops, it is necessary to remove the fallen leaves in time and burn them in a concentrated manner, and spray the pesticide in the entire shed to kill the insects.
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