With the continuous increase in the price of small peppers, the cultivation area of ​​small peppers in our county has continued to expand. It has become the main pillar of our county's main economic pillar, and its planting area has exceeded 300,000 mu. The sources of pepper micro virus in our county are cucumber mosaic virus and tobacco mosaic virus, followed by potato virus Y. Cucumber mosaic virus is the main source of poison on small peppers, and forms light green and white mottle on the leaves. Leaf surface irregular, veins shrinking deformed or forming linear leaves, slow growth, severe dwarfing, leaves can be severely yellowed, deciduous phenomenon; tobacco mosaic virus is the second source of poison on pepper, mainly in the early stage of damage , Often cause acute necrosis of dead spots or deciduous, after the heart leaves systemic mosaic, or veins necrosis, stem surface or top tip necrosis. Both viruses will cause a large number of fallen leaves, fallen flowers, and fruit drop, which will seriously affect the yield and quality of small peppers.
Cucumber mosaic virus is mainly transmitted by locusts, and the degree of its occurrence is closely related to the occurrence of locusts. Especially in high temperature and dry weather, it can not only promote the locust transmission, but also reduce the disease of pepper; tobacco mosaic virus is contacted. And the spread of wounds is spread through farm operations such as pruning. In addition, the late colonization, continuous cropping plots, low-lying land, and fertility-prone areas are likely to cause the epidemic.
According to the county plant protection station survey, the county's small pepper virus disease field rate of 100%, the disease rate of 31.2%.
Control methods:
1. Shade cultivation and control of aphids. Little solanaceous vegetables and melon crops are not planted around small pepper fields and can be intercropped with high pole crops such as sorghum and corn to reduce the occurrence of viral diseases.
2, before the onset of viral disease, spraying zinc sulfate solution and trisodium phosphate solution.
3. In the early stage of disease, use 20% of virus A WP 500 times or 1.5% of plant disease Ling emulsion 1000 times or NS-83 activator 100 times, once every 10 days for 3-4 times.
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