In a few years, Bian Xiao will introduce the harmful symptoms of corn borer and corn armyworm and how to prevent them.
Typical damage symptoms of corn borer: the larvae of corn borer mainly concentrate on tender leaves, tassels, bracts and filaments before the third instar, and most of them drill into the stems after the fourth instar.
How to control corn borer: the control time is before the third age.
The control agent can be selected from high chlorine emamectin benzoate, emamectin benzoate, chlorantraniliprole, emamectin benzoate or emamectin benzoate. Or carbofuran particles can be directly thrown into the horn, and the control effect is also good.
Typical harmful symptoms of corn armyworm: The armyworm mainly eats corn leaves.
1 ~ 2 instar larvae feed on leaves and produce holes, and larvae over 3 years old will bite the leaves into many gaps; In the stage of gluttony (5~6 years old), most leaves will be eaten, leaving only veins.
When the corn armyworm breaks out, six armyworms can eat all the leaves of a corn plant in three hours. After eating the corn in one field, they will run to another field in droves to continue to do harm.
How to control corn armyworm: try to control corn armyworm before the age of 3, if the control effect is not good in the gluttony stage.
When armyworm larvae are found, spray selective insecticides, such as fenpropathrin+emamectin benzoate, hexaflumuron+cypermethrin, etc.
In addition, the armyworm has the habit of landing in shock.
When spraying pesticides, we should also pay attention to spraying the ground to eliminate pests that fall on the ground.
The above is the information about corn borer and corn armyworm provided by Bian Xiao. I hope the above information can help you.