On May 24th, we surveyed the Xinle Brigade of Jidong Farm in Hanchuan City, Hubei Province, and saw that some farmers had lost their benefits due to planting cotton. In recent years, they changed their vegetables, and the area in which they were grown was large. The output of cowpea is relatively high. A well-planted farmer can receive 4,000 yuan to 5,000 yuan per mu, but the growth and production of cowpea vary greatly among farmers. In addition to species selection and differences in fertilizer and water management, pest control is also very important. We have found that some farmer's kidney beans have yellowish fading on their base leaves, and some have just exhibited yellowing on the leaves of young leaves, and the leaves have shrunk inwards. We have found through field investigation that the leaves are yellow. Caused by a variety of reasons.
First, there are some cowpea fields. The roots of cowpea plants are infected with root rot. Due to the continuous rainy days of the previous days, the high-water table had a more severe root disease. The more fields that were continuously planted for several years, the more yellow leaves were. The second is that in some cowpea fields, there are a few plants with new leaves that are yellow, and the tip of the new leaves have wrinkling symptoms. After careful examination, the locusts are the victims. Third, there are still a few cowpea fields, which are low in the terrain, poor in drainage, and yellow in the base leaves. Root rot, locust infestation, and waterlogging have caused some cowpeas in Daejeon to be seriously injured. We must take measures to prevent and control them as soon as possible. We must also prepare for the prevention of cowpea that has not been transplanted and planted.
For root rot, one can use 75% chlorothalonil WP to spray the base of the diseased plant, and the second can use 70% thiophanate-methyl WP to spray 800 to 1000 times, to be 3 to 5 apart. Spraying 2 or 3 times a day continuously can prevent the disease from expanding. For aphids, one can be sprayed with 10% imidacloprid wettable powder 2500 times, and the second can be sprayed with a 50% phoxim emulsion 2000 times. For cowpea seedlings that have not been transplanted, one must avoid continuous cropping with Daejeon, which has been grown with cowpea, and implement crop rotations to prevent residual pathogens from infesting. Second, the seedlings to be planted on seedling beds should be sterilized with 50% carbendazim WP 1000 times or 70% thiophanate-methyl WP 800 to 1000 times. Third, we must choose a better drainage of the field transplanting to prevent waterlogging. The fourth is to remove the bean sprouts, which are pest-infested, and bring them outside the field to bury them.
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