What are the control methods for the sorghum chinch bug?
The sorghum chinch bug, also known as the sorghum narrow long bug, is distributed in most parts of China and mainly parasitizes grasses such as sorghum, wheat and rice. It damages plants as adults and larvae, sucking plant sap, which causes leaves to turn yellow and growth to slow down. So how should the sorghum chinch bug be controlled? Let's take a look at the detailed introduction.
1. Symptoms of occurrence
It damages plants as adults and larvae. Adults generally cause damage from May to June, while larvae generally cause damage in April and July. After hatching, the larvae gather on leaves and continuously suck the sap from the leaf tissue. Larvae suck less, while adults suck more, and within a short time they form a dead spot on the leaf. As the dead spot grows larger, the leaf gradually withers and dies, causing the plant to grow slowly and, in severe cases, to die from lack of water, causing great harm.
2. Occurrence pattern
It can produce two generations a year. Adults overwinter in underground stems, leaf sheaths or just below the surface soil. After temperatures rise in spring, they begin to revive. In early April they begin to lay eggs, and early May is the peak egg-laying period. In early May differentiation begins and the first-generation larvae appear, and in about one month they can grow into adults. Adults mate and lay eggs in late June, and the second-generation larvae appear in July. In September the second-generation adults begin to overwinter, and the cycle repeats.
3. Control methods
Controlling the sorghum chinch bug requires combining physical control with chemical control. First, before planting, clean the field, remove last year's diseased and damaged plants completely, and plow the soil deeply to use the sun to kill overwintering adults and reduce the source of the pest. When the first-generation larvae appear, spray 80% dichlorvos emulsifiable concentrate at 900-1000 times dilution or 90% crystallized trichlorfon at 700 times dilution, applying 75 kg of spray solution per mu, which gives a good effect.
The above is an introduction to how the sorghum chinch bug should be controlled. We hope everyone has a good harvest every year. We hope this can help you. If you want to learn more related knowledge, please stay tuned to us.