There is no cure for corn virus disease. Insect control is the key.

In recent years, the incidence area of maize virus disease has expanded, and the harm in some areas is serious, which has a serious impact on the production of maize. Maize virus disease can be divided into two kinds: dwarf mosaic disease and rough dwarf disease. The transmission vectors of corn virus disease are insects such as aphids, thrips, gray planthoppers, etc., once the disease occurs, there is no cure. At present, the maize varieties planted are basically not resistant to virus diseases, mainly through "pest control and disease prevention" to control virus-transmitting insects for comprehensive control.

Maize virus disease

Symptoms and occurrence patterns:

After the corn was infected, the round chlorotic spots appeared between the veins at the base of the new leaves of the seedlings, which gradually expanded to the whole leaf, showing a mosaic shape. The plant is dwarfed, the seriously diseased corn plant can not bear male and fruit, premature senescence and death. The disease can be infected in the whole growth period of maize, and the corn before 5-leaf stage is susceptible to disease. After 10-leaf stage, the resistance is enhanced and the injury is serious at seedling stage. In the diseased field, the disease of spring corn was more serious than that of summer corn, the intercropping field was heavier than the direct seeding field, the vegetable field was changed to corn, and the disease was serious in the adjacent fields, vegetable fields, orchards, roadsides, canals and low-lying areas. corn in plots with extensive management, weeds, low soil fertility and weak emergence is also susceptible to the disease.

Prevention and control methods:

When corn is susceptible to disease, agricultural control is given priority to, supplemented by chemical control, and the core is to control the source of poison, reduce the source of insects and avoid harm.

1. Disease-resistant varieties were selected.

2. Maize is suitable for late sowing, so that the seedling stage of maize can avoid the active period of the first generation of gray planthopper or aphid as far as possible.

3. Eliminate weeds, eliminate poison sources and virus-transmitting insects, and reduce harm.

4. Strengthen the field management. Combined with inter-seedling and fixed seedling, the diseased plants in the field were removed, buried or burned, and the source of infection was reduced. Fertilizing and watering scientifically and strengthening field management can make maize grow healthily, shorten the infection period, reduce the chance of virus transmission and enhance the disease resistance of maize.

5. Chemical control.

(1) at the maize seedling stage, insecticides should be used to control gray planthopper, thrips and aphids as soon as possible, and 10% imidacloprid wettable powder 3000-1500 times or 25% imidacloprid 1000-1500 times could be uniformly sprayed, focusing on ditch edge, roadside and weedy plots, paying attention to intercropping and intercropping corn fields, and reducing virus-transmitting insects.

(2) at the initial stage of the onset of virus disease, 20% virus A wettable powder can be sprayed 400 times or 1.5% Zhishiling emulsion 1000 times.

(3) to mix corn seeds with internal inhalation insecticides, such as mixing 2 kg corn seeds with 5 to 8 grams of 25% pyramidone into mother liquid (the appropriate amount of water is 1 kg corn seeds to 50 grams), and sowing after drying, it can prevent the damage of gray planthopper in maize seedling stage and control corn rough shrinkage virus.