Autumn sweet corn should be heavily protected from tigers and corn borers

Autumn corn pests should mainly control good tigers and corn borers. The damage of the former will damage the heart, young leaves and the base of the young stem of the corn, causing the lack of seedlings and ridges, affecting the reasonable density; the latter damage will cause the corn stalks and tassels to be broken, and the ears will be damaged. By encroaching, it leads to reduced production and reduced quality.

Ground tigers can occur for up to seven generations a year. From the end of July to the beginning of August this year, there is more rain, more soil moisture, and there are plenty of foodstuffs in the field. The temperature is suitable for the occurrence of tigers. It is necessary to be vigilant and prevent larvae before the third age. In areas where large areas of autumn sweet corn are planted, black light and sweet and sour liquid can be used to trap adult insects, which can greatly reduce the source of insects. However, in areas where the sweet corn planting area is small, it is mainly based on chemical control. A usable special insecticidal granules, 400~600g per acre, mixed with fine sand or fine soil 2kg, applied to the vicinity of corn seedlings, can kill all ages before the 3rd instar larvae; % of emulsifiable milk 1000 times sprayed on the soil surface of corn seedlings, or mixed with 15~20 kg of fine sand or fine soil for mother liquor; three 3% of furan granules can be used for 1.5 kg per mu, mixed with fine sand 40 kg of applicator.

Corn borers can occur for up to six generations a year. When the temperature is between 16 ° C and 30 ° C and the relative humidity is above 60%, it is beneficial to the occurrence of corn borer. The insects are very heterozygous, and the host has more than 200 kinds of crops, often with overlapping generations. However, in common, when the corn borer lays eggs, the plant height is selected to be above 50 cm. The spawning part is mostly on the back of the corn leaf. Each egg has about 50 eggs, which are scattered on different plants after hatching. Precautionary measures: First, in the autumn sweet corn silking period, when the insect ear rate reaches 5%, 80% dichlorvos EC can be used to dilute into 2500~3000 times liquid, and each corn is filled with 10~15 ml, which can kill nearly 90%. Larva. The second is to use the pharmacy to spray, one can use Baturu 5% water to disperse the granules and the ultra-high content of the bismuth salt preparation, 10 grams per mu, 30 kg of water. Second, available quick-flowing phosphorus 40% emulsifiable concentrate 1500~2000 times liquid. Both agents should be used interchangeably during the incubation period. Third, the conditions can be controlled by methods such as Trichogramma or biological pesticides.

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