Corn field tiger control technology

The ground tiger uses larvae to jeopardize the young stems and leaves of the host, and its diet is extremely miscellaneous. It is mainly harmful to corn, sorghum, tobacco and various vegetables. My species are common ground tigers, earth tigers, yellow tigers and dog-earth tigers.

I. Habits and hazards

The ground tiger is divided into four stages: eggs, larvae, cockroaches and adult moths. The larvae are the most dangerous, and the life and harm habits of different age larvae are different. 1st and 2nd instar larvae stay up late at night and feed on the leaves or young leaves; they hide in the soil during the daytime after 3rd instar, which damages the young shoots at the base of the seedlings and causes the lack of seedlings; 4th instar larvae are harmful and resistant to insects. Medicinal properties are also greatly enhanced. Therefore, chemical control should eliminate larvae before 3rd instar.

Second, the occurrence of

According to a survey conducted by the county government in recent days, the field rate of summer corn is 8%, and the average rate of the affected field is 4% and the highest is 10%. Ground tigers endanger heavy plots and there are more wheat straws in corn fields.

Third, prevention and control measures

1, clean pastoral. Weeds are the ground-laying sites for tigers. They can eradicate the weeds in the fields, fields, and fields, and bring them to the fields for timely treatment or fattening. They can eliminate some eggs or larvae.

2, trapping and killing adults and larvae. The adult tiger can be used for the acid, sweet and other substances of the hobby and phototaxis, with sugar, vinegar mixture (formula: sugar 0.5 kg, vinegar 1 kg, liquor 0.1 kg, water 7.5 kg, add 15 - 25 grams of crystal trichlorfon, or instillation of 1-2 drops of dichlorvos, the above materials were thoroughly stirred well and placed in a pot, in the evening about 1 meter high from the ground, the next morning the pot will be recovered, can be The larvae can be trapped and killed by paulownia leaves, and the old paulownia leaves can be soaked in water and evenly placed into the corn field in the evening, 70-80 pieces per acre, and the next morning under the leaves. Kill larvae. It can also be used as a mixture of gray vegetables, alfalfa, mugwort, and artemisia annua. In the evening, it is placed in a corn field in small piles. The larvae are killed in the early morning of the next morning.

3, chemical control. It is best to control the application of larvae at the age of 2nd instar.

(1) spraying liquid medicine. Use 2.5% deltamethrin emulsifiable concentrate 2000 times or 50% phoxim emulsifiable concentrate 1000 times (to strictly control the dosage).

(2) Spread poisonous soil and poisonous sand. Use 50% phoxim 0.5 kg of water and appropriate amount of water, spray and mix 100 kg of fine soil, or use 1 part of 20% cypermethrin emulsifiable concentrate to mix 2000 parts of fine sand.

(3) poison bait trapping. With 90% crystal trichlorfon 0.5 kg water 3-4 kg, sprayed on 50 kg of crushed sauteed cottonseed cake or wheat bran, or with 50% phoxim EC 50 grams per mu, mixed with cotton seed cake 5 kg ( Or mash fresh grass). Poison baits or poisonous weeds are scattered near the roots of seedlings in the evening, at a small distance of 15-20 kg per mu.

(4) Irrigation. When the worm age is relatively large, 80% of dichlorvos EC or 50% phoxim should be used, and 0.2 kg of water per mu and 400 kg of water per mus should be used to irrigate the roots, or be applied to the control of plant stems (safety interval 5-7 days).

(5) Manual capture. For severely damaged plots, when the seedlings are broken down in the field, the topsoil or wheat straw near the broken seedlings can be removed early in the morning to kill old larvae.

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