Technical Points of Prevention and Control of Two-pointed Moth, Summer Maize at Seedling Stage
The two point insects are a newly emerging pest in summer corn producing areas in China. Wheat stalk return provides an excellent environment for the selection of two-pointed moths, concealment, and oviposition and hatching in wet sites. Once the larval period peaks, corn seedlings will emerge. An anastomosis and a suitable precipitation may cause serious harm. The main danger of the two pointworms is that the larvae bite the stem bases and roots of the corn, resulting in wilting and dead plants, resulting in the lack of seedlings to break ridges and even destroy the seed. This year, two Aetna control moths in the north-central part of our province have high wheat straw coverage, and farmers' friends must do a self-examination work to prevent early damage so as to avoid losses.
Insect resistance
From June to mid-July, it is the second generation of the two-stage A. exigua, which is the most harmful crop, and it is the main damage generation for the whole year. According to the survey, the reason why two A. moths increased from general insects to major agricultural pests was due to the returning of straw to wheat after harvesting. When planting summer maize, the land was not ploughed, resulting in a large amount of wheat straw, wheat bran and other coverings accumulated in the field. Dotworms hide in them, lay eggs and breed larvae. The larvae are afraid of light, and the cover is cool and dark, which is very suitable for its survival. According to a survey conducted last year, larvae were uneven in the field and were covered with wheat straw, wheat stubble, and other corn seedlings. The larvae weighed heavily; corn seedlings exposed in the roots and stems were free of larvae. During the occurrence of the main damages of the two Aedes moths, appropriate methods should be used to control them according to their age.
After cleaning the wheat in the idyllic field, the wheat stalks will be treated in a concentrated manner; under conditional conditions, the ridges will be rotted and the fields will be covered without any cover. The two-pointed caterpillar has no hiding place and will naturally not be harmed by the corn field; before the corn planting, the corn will be covered before emergence. The 15 centimeters from the sowing line will also significantly reduce the hazard rate.
Spraying adult worms to prevent O. moth oviposition can effectively reduce the number of larvae. In the early to mid-June, you can use tools to touch fields such as wheat straw in the afternoon. If you start to fly a large amount of moths, it means that there are two Aedes moth hidden in this area and you should immediately spray and kill. . Can be used 2.5% Lambda-cyhalothrin EC 2500 times or 4.5% Beta-cypermethrin 1000 ~ 2000 times or 48% chlorpyrifos EC 800 ~ 1000 times or 30% acephate EC 600 times the whole field uniform spray control. In order to increase the insecticidal effect, it is possible to add 10% Suppository EC 2000 times. Spraying adults can be carried out in conjunction with spraying of enclosed herbicides.
2nd instar larva spray control
The larval pests are under the cover of corn ridges and the damage to the corn is not obvious, and there are no larvae around the corn seedlings.
It is expected that the larvae will enter the 2nd instar stage from June 22 to 27. This stage can be controlled by spraying. Available with 50% phoxim EC 1000x or 20% Chlorantraniliprole SC 4500 times or 80% Dichlorvos 1000x or 2.5% Lambdamethrin 2000x or 48% chlorpyrifos 1200x Liquid or 30% toxic cyste microcapsule suspension 1200 times liquid uniform field spray control.
Induction and killing control of 3rd instar larva
The 3rd instar larvae have concentrated on the roots of the corn seedlings and begin to bite the roots, drill holes, and wilting or ripping up the corn in the fields. When the 3rd instar larvae enter the gluttony at the beginning, the drug resistance is greatly increased. The method of poisoning baits and poisonous soils should be adopted to protect the seedlings.
One of the poison bait recipes is to use 48% chlorpyrifos EC 100 ml plus 80% dichlorvos 200 ml plus 1.5 kg of chopped cabbage leaves or weeds and 5 kg of sauteed wheat bran. Stir in the water until it becomes a stick and mix into baits. In the evening Sprinkle a small heap about 5 cm away from the base of the corn seedling stems. Spread more wheat straw to cover thicker parts. The second is to use 30% toxic cystic microcapsule suspension 500 ml mixed 12.5 kilograms of sauteed wheat bran, and then boring for 2 hours, these poison baits used for 3 acres of land, also in the evening scattered small heap applied to the base of the corn seedling stem about 5 cm away. Generally, the hazard rate on the second day is significantly reduced.
Toxic soil formula uses 80% of dichlorvos EC 300-500 ml or 48% of chlorpyrifos EC 500 ml, 30% of toxic xin microcapsule suspension 500 ml, add appropriate amount of water evenly into 25 kg of fine soil, in the morning along the ridge ring Sprinkled next to the corn seedlings.
Due to a period of only 3 to 4 days, farmers should seize the time for prevention and treatment.
More than 4 years old
The 4th instar larvae were 1.4 cm in length and appeared around July 7th. In the field, the damage to the corn is obvious, and the larvae will be damaged by rotation. One larvae can continuously harm 7 to 8 corn seedlings, and they also feed on corn seedlings during the day. In response to overeating of older larvae, emergency measures can be taken - irrigation.
Can be sprayed with 100 kilograms of liquid per acre in corn seedlings. Pharmacists can use 48% chlorpyrifos EC 1500 times, 30% acetomethoxate EC 1000 times, unscrew the sprayer spinner or spray with a straight nozzle on the stem base of corn seedlings.
Can also be used per acre with 48% chlorpyrifos EC 800 ml, or 50% phoxim EC 500 ml plus 48% chlorpyrifos EC 300 ml, diluted into 200 times with water pouring on the ridge between the rows of corn back. In order to prevent the larvae from climbing above the upper part of the wheat straw, water should be pressed into the water with shovels while shoveling water.
Shakti Mat Pillow,Acupressure Mat Pillow,Acupressure Neck Pillow,Acupressure Mat With Pillow
Ningbo Prestigeplus Commodity Co.,Ltd , https://www.prestigemedics.com