The scientific name is Ostrinia furnacalis (Guenee) Lepidoptera, Gnatidae. Distribution In addition to the Qinghai-Tibet Plateau, the countrywide corn planting areas are widely distributed. Among them, the spring maize area in the north and the spring and summer corn areas in Huanghuai Plain were heavily damaged, and the southwest mountainous areas and the southern hilly corn areas followed.
The host Asian corn borer has increased its damage to cotton year by year and has become one of the important pests on cotton. In addition to damaging cotton, it also harmed 25 crops such as corn, sorghum, millet and hemp.
The larvae caused damage to the larvae. The heads and leaves of cotton were withered and drooping, and the hollows were broken. After the leaves die, the larvae feed on the main stems, and dung or worms accumulate at the entrance to the hole. The branches above the pods gradually wither, and the wind easily collapses. When the cotton bud is damaged, the boring hole is about 4mm, and it is easy to form a pest flower, that is, “twistâ€, and generally does not eat. When the corn borer is a bell, there is a hole in the middle of the bell, with the same aperture. The bell is perishable or the fibers and cotton seeds in the bell chamber are solidified into black cakes or bolls. There is light yellow paste or sawdust-like wet excrement inside and outside the hole. The small bell falls off. The big bell does not fall but the bell The inner fibers and seeds are eaten. Different from cotton bollworm.
Morphological characteristics, living habits Damaged cotton corn borer Mature larvae body length 23-25mm, milky white, slightly pink or gray back, head brown, black spots. For other characteristics and living habits, see the corn pest, Asian corn borer, in the book. The worm is 3 generations old in the cotton area of ​​the Yellow River Basin and 3 to 4 generations in the Yangtze River Valley. The mature larvae live in the damaged stalks of damaged cotton stalks, corn stalks, and cocklebur. The first-generation larvae are responsible for the cotton, and the spawning period begins in late May and early June, and after 6 months, the larvae drill for cotton stalks or bells. In recent years, the area damaged by spring maize has been reduced. In areas where spring and summer corn and cotton are intertwined and wheat and cotton are intercropping large areas, corn stubble has caused damage to cotton. In the Yellow River Basin, the cotton larvae entered the larvae during the middle and early June. The first generation of cotton in Jiangsu was concentrated in the cotton fields and the second and third generations were transferred to the corn fields. Summer cotton is the focus of the cotton generation, and the wintering ground is mainly corn stalks. Spring corn cotton area is cotton stalk, these characteristics should cause production attention to facilitate the implementation of scientific prevention.
Control methods (1) Agricultural control The wheat or cotton in the Yellow River valley is used as a field or area, and the wheat is transported out of the field in time after harvest to prevent the transfer of corn stubble to the cotton plant. In the mixed regions of corn and cotton in the lower reaches of the Yangtze River, attention should be paid to the appropriate proportion of the area. If possible, it is possible to achieve regional planting without staggered planting, which can effectively reduce damage to cotton fields. When necessary, cotton field sparsely planting some corn, attracting corn eggs to spawn, and then timely ovulation. (2) Biological control Trichogramma was released at the height of spawning of the 2nd and 3rd generation of corn borers, releasing 10,000 heads per 667m2 and releasing them twice. The larvae were sprayed with Beauveria bassiana or B,t emulsions. (3) Pharmaceutics control The second generation of corn field in cotton field has more than 3.72 pieces of egg mass, three generations of more than 4.97 pieces, or 3% of the rate of new shoots. It should spray 2.5% bromine immediately at the peak of egg hatching. Chrysanthemum buttermilk oil 2000 times or 50% parathion EC 2000 times, 50% phoxim EC 1500 times, 5% Rhentex 1500 times, 20% cyanine 2000 times, 25% Guangkewei Emulsion 2000 times, 20% Mituwe Emulsion 2000 times.
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