After the Huaihe River Basin entered the "summer" season of the lunar calendar, most rural villages began to plant cotton and wheat to cover corn. In recent years, corn has grown to 30 days after sowing (usually from late June to early July), and it is prone to "rough shrinkage." When corn seedlings are above 50 cm in height, they are harmed by the virus-infected insect SBPH, and the incidence of corn seedlings is extremely high. Three rural households, including Xinbucun Chen Bisheng, Wutan Town, Suining County, Jiangsu Province, sow 3 mu of corn in 2007. They have suffered from epidemics in late June and lack knowledge of prevention and control. The dwarf diseased plants, the leaves are stiff, and they are broad, short and thick. The color is dark green, the upper internodes shrink, and the top leaves are clustered. Dotted stripes appear on both sides of the midrib of the heart. About 90% of corn seedlings suffer from atrophic thickening of the culm and do not hang corn heads. Like a long green plant, “evergreen†In the same way, there are only three to fifty grains of corn on the tip of the tip, which reduces the yield of corn by more than 85%. It is understood that only in last year's Wutan Town, Suining County, there were 800 acres of corn that had been subject to "rough shrinkage."
How does "rough shrinkage" arise, and how do you prevent and control such "rough shrinkage"? Wu Youtie, a town agronomist in the town, proposed scientific prevention and treatment of “roughening disease†and “nemesis†for the peasant brothers. The causes of the disease are more complex. First, there is a large amount of bacteria in the soil. There is a residue of the bacteria on a piece of corn on the ground. The second is caused by the transmission of poisons by wheat fields and wheatgrass in Sakata, especially during the drought. To combat this problem, first of all, we should use anti-“rough-draw†disease, large and small spot disease improved varieties, and “coating†seeds such as Suyu 19 and Jinhai 5. Second, adjust the sowing date, spring corn in late April, summer maize sowing in mid-June, to avoid the peak of virus activity insects and corn virus growth period is the same to reduce the occurrence of diseases. Third, remove the source of virus infection, remove the weeds in the fields, and reduce the number of locusts and residues of Laodelphax striatellus to reduce infection.
How to use drugs to prevent "roughening" seedlings? First of all, under the guidance of agricultural technicians, in the absence or emergence of corn seedlings related to virus damage, advance in the 3-4 leaf and 7-8 leaf stage, respectively, leaf stage pick sunny at noon with 10% of the insecticide Spirit 20 grams, or 5% fipronil 30 ml and 10% 10% imidacloprid, add 30 kg of water evenly spray. For example, after the onset of the disease, spraying in plants such as plant spirits, bacterin-clearing agents, and acetic acid and other drugs such as acetamiprid will have better control effects. According to the disease situation, it took two days (times) for five days to roll the medicine twice, which served as an effect of “prevention†and “treatmentâ€. The virus in the seedlings of maize was propagated and replicated by infecting pathogens in the seedling fiber cells. Therefore, it is necessary to immediately remove the spread of field defense against the disease strains that have become infected.
Due to environmental pollution, pests and diseases occur. The widespread occurrence of "rough shrinkage" hazards in the vast areas of corn planted nowadays, and for this purpose, it hopes to arouse the attention of the relevant agro-technical departments and the vast number of farmers.
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