Prevention and control of two Aedes moths

The two A. japonica larvae are 1.4-1.8 cm long, yellow-gray or dark brown, and occur lightly in the corn planted in the wheat field. They mainly damage the corn seedlings with larvae hiding under the crushed wheat straw around the corn seedlings. In the 3-5-leaf plots of corn seedlings, the larvae mainly bite the base of the corn stems, resulting in wilting of dried leaves on the ground. The larger larvae in the maize seedlings (8-10 leaf stage) mainly bite off the roots of the corn, including aerial roots and main roots, resulting in corn lodging and severe death. Because the insect lurks under the crushed wheat straw in the corn field and damages the roots and stems of the corn, spraying is generally not effective.

The highest point of the damage of the two pointworms is corn three-leaf period, which lasts from late June to early July. The appropriate period of chemical control is around the end of June.

Comprehensive prevention and control measures:

1. Agricultural measures

(1) After wheat is harvested, the land will be ploughed and turned over to cover mulch, wheat bran, weeds, etc. If the land is not ploughed in time, coverings such as wheat straw and weeds in the corn field must be removed to eliminate the hidden environment.

(2) For the lodging of large maize seedlings, while controlling the pests, the soil is used to raise the seedlings, promote corn rooting, and restore normal growth and development.

(3) The land with serious damage will be changed to suitable crops according to local conditions.

2. Physical measures

Fields were suspended from two Anethole sex attractants, insecticidal lamps were added, and adult insects were trapped to reduce the amount of eggs in the field.

3, chemical prevention

(1) Poison bait. Mu with 4 to 5 kilograms of sauteed wheat bran or crushed sautéed cottonseed cake, mixed with 48% chlorpyrifos cream or 90% crystal trichlorfon 500 g baited in a small amount of water, sprinkled in the corn seedlings in the evening cis ridge side.

(2) Sprinkle granules or toxic soil. Mu with 50% phoxim 150 ~ 200 ml against fine sand or fine sand 50 kg, or mu with 80% dichlorvos EC 300 ~ 500 ml mix 25 kg of fine soil, in the morning along the ridge in the seedlings and scooping corn seedlings.

(3) Dosage with water. Watered corn fields can be filled with water, and 48% of chlorpyrifos-containing emulsifiable concentrate is used for 1 kilogram, which is poured into the field when it is poured.

(4) Implement early medication: The medicament sprays corn roots. Pharmacists can choose 48% chlorpyrifos EC 1500 times, or 4.5% cyfluthrin EC 2500 times.

(5) Must kill the adult that inhabits the wheat aphid, especially lodging the wheat field, emphasizing 2 times of medicine. General Tian, ​​before seeding after sowing, first go to Tanaka to poke again. If the number of moths is large, please spray and kill immediately. According to the study, 90% of the sprayed worms were effective. This control can be combined with the sealing of the ground weeds, but the liquid volume should be 3 barrels. The ratios of the medicament and the mixture are: 48% chlorpyrifos EC 800 to 1000 times, 30% acephate EC 600 times, 80% dichlorvos 1000 to 1500 times, 40% phoxim 800 to 1000 times, or 30% of Toxicol microcapsule suspension is 1200 times liquid, evenly sprayed in the whole field in the evening, at the same time, it can also treat existing young larvae. In recent years, large-scale sprayers have gradually entered the production line. These sprayers have good atomization of pesticides, uniform spraying, high speed, and better results, and can be used.

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