In the corn seedling stage, if it encounters high temperature and rain, and many pests and diseases, it poses a direct threat to corn production. According to a recent investigation by the Wuqiao County Plant Protection Station, pests such as the locusts in the corn fields are heavy, and attention should be paid to prevention and control.
First, the situation
1. Gray planthopper. The harm of Laodelphax striatellus to corn is mainly to spread the rough-reducing virus. The earlier the disease is infected, the more serious the damage is, the lighter the yield is reduced by more than 10%, and the severely reduced yield is 30% to 50%. Recently, the field survey in late spring sowing corn fields and most of the summer direct seeding corn fields have a large number of gray planthoppers, and some plots have appeared coarse and shrinking disease seedlings. Generally, the number of insects per square meter is 7-8, and many of them reach More than a dozen heads, the situation is very serious, and should be immediately prevented.
2. Hummer. Hummer is a kind of pest that has been worsened in corn in the past two years. On June 15th, the late spring sowing and some early sowing summer corn were seriously damaged, and there was a situation of concentrated harm. Many plants showed silvery gray on the leaves. The spots are yellow, the leaves are chlorotic and yellow, and some of the plots have appeared in the tail of the cattle. The rate of the damaged plants is 80% to 90%. The average yield per plant is 20 to 30, and the number is 60 to 70. The damage is very serious. . In the summer corn field survey on June 23, the rate of the infected plants was 50% to 60%, and the average number of insects per plant was 10 to 15 heads, and the number of infected individuals was 20 to 30.
3. Swedish stalk fly. Some of the plots were also damaged by the Swedish stalk fly. The larvae were directly drilled into the corn heart after the hatching, and the damaged heart was broken and mucus. The stalk fly larvae were stripped on the spot.
Second, prevention and treatment methods
In view of the actual situation of the three pests in the field at the same time this year, comprehensive prevention and treatment combined with large prescriptions should be adopted.
1. Timely manual removal of weeds in the field and surrounding areas, or use of post-emergence herbicides such as Jiyu (main ingredient is sulcotrione plus hydrazine) 200 ~ 250 ml / mu or 4% Yu Nong Le 80 ~ 100 ml.
2. The corn field with undetermined seedlings can be combined with the seedlings, the tails of the cattle and the rough-removed diseased seedlings are removed, and the field treatment is carried out to prevent the re-transmission of the field and the transfer of the thrips. The corn fields with the seedlings should be removed in time to remove the diseased seedlings. In the field, the tail of the ox tail can be artificially cut off the length of 3 to 5 cm to help the seedlings resume growth.
3. Big prescription prevention. Adding beta-cypermethrin mixed spray with imidacloprid or acetamiprid, the density of the gray planthopper in the field (more than 8 to 10 heads per square meter) should be added with 20% virus A or gold fluoromorpholine spray control, and some weak seedlings should also be added. A good quality potassium dihydrogen phosphate solution (concentration of 0.2% to 0.3%) is sprayed together to promote the plant to weaken as quickly as possible.
Third, matters needing attention
1. Swedish stalk flies and thrips are both harmful in the corn heart, and the liquid should be sprayed into the corn heart during spraying.
2. Gray fly cockroaches are good at flying, it is best to spray and control adjacent plots together, and take a prevention and control method from the surrounding to the middle to improve the control effect.
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