Identification and Control Methods for Larvae and Eggs of the Sorghum Banded Red Seed Bug
The sorghum chinch bug, also known as the sorghum narrow long bug, is distributed across most regions of our country. It mainly parasitizes gramineous plants such as sorghum, wheat and rice, damaging plants as adults and larvae by sucking plant sap, causing leaves to turn yellow and growth to slow down. So how do you control the sorghum chinch bug? Let's take a look at the detailed introduction below.
Banded red seed bug: insect belonging to the order Hemiptera, family Lygaeidae. It is distributed in Heilongjiang, Jilin, Liaoning, Inner Mongolia, Hebei, Shanxi, Shaanxi, Ningxia, etc. Its hosts are cruciferous vegetables such as Chinese cabbage, rapeseed and cabbage. Adults and nymphs gather on tender leaves to pierce and suck sap, causing the leaves to wither.
Its life stages include adult, egg and nymph, and it damages plants by adults and nymphs piercing and sucking plant sap. Adults and larvae gather on tender stems, tender melons, tender leaves and other parts, piercing and sucking sap; the pierced spots turn brown, and in severe cases the plant withers. Adults fear strong light, and feed more actively before 10 a.m. and after 5 p.m.
1. Occurrence symptoms
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 the leaves and continuously suck the sap of the leaf mesophyll tissue. Larvae suck less, while adults suck a large amount and can form a dead spot on the leaf in a short time. As the dead spot grows larger, the leaf gradually turns yellow and dies, causing the plant to grow slowly, and in severe cases the plant dies from lack of water, making the damage extremely serious.
2. Occurrence pattern
It can produce two generations a year. Adults overwinter in underground stems, leaf sheaths or beneath the surface soil. After temperatures rise in spring, they begin to revive, starting to lay eggs in early April, with the peak egg-laying period lasting until early May. Differentiation begins in early May, and the first-generation larvae appear and can grow into adults in about one month. 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
To control the sorghum chinch bug, physical control should be combined with chemical control. First, before planting, clean the field, remove the diseased and residual plants from last year, and deep-plow the soil to use the sun to kill overwintering adults and reduce the source of insects. When the first-generation larvae occur, you can spray 80% dichlorvos emulsifiable concentrate at 900-1000 times dilution or 90% crystallized trichlorfon at 700 times dilution, spraying 75 kg of solution per mu, with good results.
The above is an introduction to how to control the sorghum chinch bug. 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.