Maize rough disease is a viral disease caused by a maize roughing virus. When one leaf is one heart, it can be harmed. When 5-6 leaves are used, symptoms begin to appear. Once infected, it is poisonous for life, and basically no medicine can be cured. It is called "corn cancer". The disease is an important disease in the northern corn production area of ​​China, and it can be infected throughout the growing season, especially in the seedling stage (before the 5th leaf stage).
Symptoms: The leaves of the diseased plants are thick green, erect, the leaves are widened and thickened, and the internodes are shortened. The upper leaves are densely populated, and there are waxy white protrusions on the back of the diseased leaves, which have obvious roughness. The vascular bundles in the roots and stems are swollen, and the roots are underdeveloped and easy to pull out. The lighter tassel spindle is shortened and can be plucked, but it is half wrapped in the bell mouth, with little or no pollen, and the tassel is aborted, the filament is not developed, and there is very little fruit. The plants are dwarfed, the ears are malformed, the stalks are short, the ears are not strong or the stalks are broken, resulting in severe reduction or no harvest.
Causes of the disease: pre-planting drought; the surrounding virus base is large, the vegetable plots, the surrounding weeds are susceptible to disease; the sowing period is not suitable, the seedling period is catching up with the peak of the fly ash, and susceptible to disease.
Control methods: First, select disease-resistant varieties, strengthen fertilizer and water management, increase application of phosphorus and potassium fertilizers, and improve plant disease resistance; second, remove weeds in the field and reduce virus reproduction; third, seed treatment for "prevention": Appropriate gold plus imidacloprid or 2% seed dressing with 5% eucalyptus emulsifiable concentrate, can also be treated with special coating agent or seed dressing agent; Fourth, 8% Ningnanmycin in the early stage of corn rough disease +5% chlorfenapyr mixed spray, or 8% Ningnanmycin + 50% anti-Suiwei spray, the effect is good, and the pests are solved once; "avoiding" the fly ash migrating peak period: suggesting spring in North China The corn sowing period is before April 20, and the summer corn sowing period is after June 10.
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