Disease and prevention and treatment of maize rough shrinkage

Corn craggy disease is a corn virus disease caused by corn craggy virus, which is spread by grey planthopper

Important disease prevalent in the production area.The disease can be infected throughout the growth period, and the seedling period is the most affected, with 5 to 6 leaves showing the disease,

Begin to produce a clear oil-soaked faded green dotted line at the base of the heart leaf and on both sides of the midvein, gradually spreading throughout the leaf blade.Sick shoots dark green,

Leaf blade is rigid, wide, short and thick, heart leaf cannot expand normally, growth is slow, internode is shortened, parietal leaf is clustered like a regal orchid.9 -
When leaves 10, the phenomenon of disease plant dwarfing is more obvious, the height of the disease plant is less than half of the healthy plant, most can not tassel bearing.

The prevention and control of maize rough shrinkage disease should adhere to the comprehensive prevention and control plan with agricultural prevention and control as the main and chemical control as the auxiliary:

1) strengthen the detection and prediction of key sites in the areas where diseases often occur, and regularly investigate the rate and severity of maize coarse shrinkage disease
Degrees.

2) selection of disease-resistant varieties.

3) adjust the sowing date: according to the occurrence law of corn rough shrinkage disease, the sowing date should be adjusted in the areas where the disease reoccurs to make the corn right
The most sensitive breeding period is avoided to reduce the incidence of adult grey planthopper.Spring sowing corn appropriate early sowing, wheat field interplanting
Corn appropriate late sowing, as far as possible to shorten the symbiotic period of wheat, corn.

4) weed removal: weeds along the road and in the field are the hosts of the grey planthopper, a virus carrier of corn rough shrinkage disease, to live through the winter and summer.

5) strengthen field management: in combination with the regulation of seedlings, remove diseased plants in the field, bury or burn them intensively, and reduce the infection sources of rough shrinkage disease.

6) drug prevention: seed mixing and drug spraying.