How to control the rough dwarf disease of maize when it is seriously dwarfed and cannot bear fruit?

Maize rough dwarf disease, commonly known as sitting slope, can occur in all growth stages of maize, is more common in early summer sowing corn field, and the most serious damage in seedling stage. Transparent oil-immersed chlorotic virtual lines began to appear at the base of the heart leaf and on both sides of the midrib of corn, and gradually extended to the whole leaf. The diseased seedling is thick green, the growth is slow, dwarf, the leaf is wide, short and stiff, the leaf color is dark green, the Internode is thick and short, and the top leaf is like a cluster. There are waxy strips with protuberances of different thickness on the veins of leaves, leaf sheaths and bracts. From 9 to 10 leaves, the dwarfing was obvious. Most of the maize with rough dwarf disease can not ear and bear fruit, although it can produce a few male ears, but it has few branches and no pollen. Abnormal ear, very few filaments, serious dwarfing, degeneration of male ear, deformed female ear, and can not bear fruit seriously.

Maize rough dwarf disease

Prevention and cure method

1. Disease-resistant varieties were selected. The maize varieties with relatively good resistance were selected and the planting area was distributed reasonably to avoid large-scale planting of maize with single resistant source.

2. Remove weeds. Roadside and field weeds are not only the provenance of weeds, but also the overwintering and summer hosts of gray planthopper, a vector of maize rough dwarf disease. The removal of weeds can reduce the harm of maize rough dwarf disease to some extent.

3. Strengthen the field management. Combined with fixing seedlings, pulling out diseased plants in the field, concentrated deep burying or burning, the infection source of maize rough dwarf disease was reduced. Reasonable fertilization and watering, strengthen field management, promote the growth of maize, shorten the susceptible period, reduce the chance of virus transmission, and enhance the disease resistance of maize.

4. Spraying to kill insects. One is to mix corn seeds with chemicals before sowing. Coating and dressing corn seeds with internal insecticides can effectively control gray planthopper at seedling stage and reduce the spread of rough shrinkage disease. The second is spraying to kill insects. When the corn grows to 2 leaves and 1 heart, the diseased fields are controlled by spraying insecticides + antiviral agents + foliar fertilizer, such as aldicarb, propofol, imidacloprid, acetamiprid, etc., antiviral agents are Shiduqing, virus A, etc., foliar fertilizer is potassium dihydrogen phosphate, spray Shibao, etc., respectively according to their dilution multiple, spray once every 7 days, three times in a row.