The size of the corn leaf spot is generally related to the extent of the small spot disease in July. When the rate of diseased plants reached 70%, the diseased leaf rate began to develop from the bottom up; when the rainfall was early, the rate of diseased plants increased early; vice versa. Control method: first remove 1~2 diseased leaves at the bottom of the corn and destroy them; spray 50% carbendazim or 70% thiophanate 500 times solution, or mancozeb 800 times solution, or 50% carbendazim 500 times solution, etc. .
Corn spot disease was selected from the main cultivated varieties and the growing corn fields. Five-point sampling was taken to check the number of diseased plants per plant, the number of leaves per plant, and the severity. When the rate of diseased plants is 100% and the diseased leaf rate is 30%, there is a rainfall process, which can be controlled. Control method: spray 12% green milk copper, or 25% enemy force to remove 2000 times liquid, or 40% virulence suspoemulsion 1000 times liquid or 80% new Wansheng 700 times liquid.
Maize round spot disease was selected for anti-infective varieties. Five points were taken and 10 strains were inspected at each point. The rate of diseased plants and the number of leaves per plant were examined. It is generally sprayed and controlled during the spraying of the ear. Control method: spray with 25% powder rusting 500~800 times liquid.
Corn smut disease should be removed in time.
Corn virus disease has corn shrinkage and dwarf mosaic disease (flower leaf stripe disease), which is transmitted by the brown planthopper and aphids, and the number of gray planthoppers and aphids in the field is closely related to the number of weeds in the field. However, the degree of poisoning of the brown planthopper and aphid is related to the occurrence of wheat bush dwarf disease, so the degree of occurrence of corn virus disease can be judged according to the degree of wheat bush dwarf disease. In the prevention and control, we mainly eliminate weeds and insects to prevent serious occurrence of corn virus disease. Control method: In the field investigation, the suspicious disease strain should be removed immediately and sprayed with anti-virus control, such as 25% virus A500 times, or 5% bacteria poison + Tianfengsu + zinc fertilizer, or 25% virus king, etc. .
The corn borer pays attention to the hatching progress of the field eggs and the damage of the larvae, and seizes the critical period to control the first generation corn borer. Control method: granules can be made with Bt emulsion or granules with 1605, phoxim emulsifiable concentrate, or Beauveria bassiana granules, or 3% for Leer granules, or 98% Bataan soluble powder for granules. Into the corn big bell mouth, kill the newly hatched larvae.
The main species of corn moths harming corn fields are the moths. In the end of July, the number of eggs and the number of larvae on 100 strains were investigated. When it was found that 500 corns had 2 eggs, or the ears of the bitten grains reached 15% or more, they were immediately controlled. Control method: The newly hatched larvae of the moths have a habit of concentrated harm. After the silk is spun silk, there are many larvae, which can organize artificial catching insects or spraying drugs.
Corn spot disease was selected from the main cultivated varieties and the growing corn fields. Five-point sampling was taken to check the number of diseased plants per plant, the number of leaves per plant, and the severity. When the rate of diseased plants is 100% and the diseased leaf rate is 30%, there is a rainfall process, which can be controlled. Control method: spray 12% green milk copper, or 25% enemy force to remove 2000 times liquid, or 40% virulence suspoemulsion 1000 times liquid or 80% new Wansheng 700 times liquid.
Maize round spot disease was selected for anti-infective varieties. Five points were taken and 10 strains were inspected at each point. The rate of diseased plants and the number of leaves per plant were examined. It is generally sprayed and controlled during the spraying of the ear. Control method: spray with 25% powder rusting 500~800 times liquid.
Corn smut disease should be removed in time.
Corn virus disease has corn shrinkage and dwarf mosaic disease (flower leaf stripe disease), which is transmitted by the brown planthopper and aphids, and the number of gray planthoppers and aphids in the field is closely related to the number of weeds in the field. However, the degree of poisoning of the brown planthopper and aphid is related to the occurrence of wheat bush dwarf disease, so the degree of occurrence of corn virus disease can be judged according to the degree of wheat bush dwarf disease. In the prevention and control, we mainly eliminate weeds and insects to prevent serious occurrence of corn virus disease. Control method: In the field investigation, the suspicious disease strain should be removed immediately and sprayed with anti-virus control, such as 25% virus A500 times, or 5% bacteria poison + Tianfengsu + zinc fertilizer, or 25% virus king, etc. .
The corn borer pays attention to the hatching progress of the field eggs and the damage of the larvae, and seizes the critical period to control the first generation corn borer. Control method: granules can be made with Bt emulsion or granules with 1605, phoxim emulsifiable concentrate, or Beauveria bassiana granules, or 3% for Leer granules, or 98% Bataan soluble powder for granules. Into the corn big bell mouth, kill the newly hatched larvae.
The main species of corn moths harming corn fields are the moths. In the end of July, the number of eggs and the number of larvae on 100 strains were investigated. When it was found that 500 corns had 2 eggs, or the ears of the bitten grains reached 15% or more, they were immediately controlled. Control method: The newly hatched larvae of the moths have a habit of concentrated harm. After the silk is spun silk, there are many larvae, which can organize artificial catching insects or spraying drugs.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
Eptfe Material Properties,Ptfe And Eptfe,Ptfe Membrane Sheet,Eptfe Gasket Material
Cixi Congfeng Fluorine Plastic Co.,Ltd , https://www.cfptfeseal.com