In recent years, rice tuber Tengma has occurred at various levels in Pingchuan town of our county, and the area of ​​occurrence has been expanding year by year, and the degree of damage has been increasing year by year. The worm has a strong social, random and concealed nature and is not easy to be discovered. It generally reduces the production of agricultural land by 20-40%, and when it is severe, it reduces production by 50-60% or even jeopardizes the harvest, seriously affecting people's production and life.
I. Features and identification
1.Characteristics: Indica tuber is a genus Thysanoptera and tuber gnataceae pest. Adult body length 1.5-1.8 mm, dark brown, rectangular head, piercing suction mouthparts, transparent fore wings, the end of abdomen was tubular, tentacles 8 (7 sections of rice thrips tentacles), nymphs with similar body shape.
2. Hazardous symptoms: The glume of the rice shell is deformed, not closed, and not strong, and severe heading does not occur.
3. Identification method: As the rice tube is very small, it is difficult to detect with the naked eye. After the head of the affected rice is harvested, the ear and leaf of the victim are gently shaken on the white paper. After the fall is collected, the worm body can be observed through a magnifying glass or a microscope. .
II. Occurrence characteristics
1. Generations: My county has 8-10 generations in the year, breeds quickly, and has many generations.
2. Overwintering and Insect Sources: The worm has four major characteristics: small body, rapid propagation, great harm, and difficult recognition. Adults live in rice piles, fallen leaves, and weeds.
3. Host crops: Widely hosted in rice, wheat, corn, barnyardgrass, sorghum and other cereal crops and grass weeds.
4. Occurrence period:
According to investigations in recent years, rice tuber thrips have been jeopardized during the whole growth period of rice, but the number of occurrences of rice in the early growth period is small, and the damage is light. The main hazard is the occurrence of rice thrips. In the early stage of rice leaves, symptoms such as grayish white spots, chlorosis, and leaf tip dryness often appear, which is mainly caused by the damage of rice thrips, but not caused by rice tuber thrips.
Rice tuber thrips occur more frequently in rice at the end of booting stage than at the heading stage. The main hazards are flowers, glume and ear grains. The stigma was damaged by adult worms and destroyed the ovary, causing the glume to be closed, the ear grains to be deformed, and not to be solid. In severe cases, rice ear can not be properly extracted, causing the grain to be impractical.
III. Comprehensive prevention and control technology measures
1. Period of prevention and cure
1 Prevention and cure 1 time (3 days before marriage) in 3 days prior
2 1 day after transplanting, control and prevention 1 (combined with prevention and treatment of II);
3 Prevention and treatment of middle and late Daejeon: There was no field in Pingchuan, our county. It was prevented 1 time at the end of booting stage (late July - early August) of rice during the period from the end of booting stage to 2 times during the last year, usually in mid-July. Prevention and control of the first time, late July to early August, prevention and control of the second time; severe occurrence of the previous year and caused greater damage to the field prevention and control 3 times, early July to early July and early middle of July 1st prevention and control, mid-July prevention and control 2nd Times, the third time in late July - early August.
2. Agricultural control
In the winter and spring, the weeds in the fields are removed, especially weeds in the vicinity of the fields, and the number of insect populations is reduced. Cultivate and transplant strong and enhance resistance.
3. Chemical prevention
Use 10% imidacloprid wettable powder 30 g/mu, or 25% aquate (thiamethoxam) water dispersible granules 4 g/mu, or 25% pymetrozine wettable powder 25 g/mu, or 35% Dandan WP 40g/mu, spray evenly on water 50kg.
Four. Matters needing attention
1. Because the insect is alive and good, it is best to concentrate on the prevention and treatment of the drug when using the drug. Use the secondary dilution method to dispense the drug. Spray the drug from the field around the middle to the surrounding spray to prevent it from migrating to untreated fields.
2.7 months is a hot season, should avoid high temperature during noon, before 10 am and after 4 pm medication.
3. From the perspective of ensuring the quality and safety of agricultural products, low-toxicity pesticides should be selected during the middle and late stages of rice growth. At the same time, scientific selection of pesticide species should be used, and the amount of pesticides used must be accurate. It is not possible to arbitrarily increase or decrease the dosage.
4. Rain falls 24 hours after spraying and should be sprayed.
5. alternate use of drugs alternately to avoid pest resistance. A growing cycle of a crop, a pesticide is only allowed once.
6. The amount of water should be sufficient. In the late stage of rice growth, the leaves are large, the plants are dense, and the amount of water per mu is more than 50 kg to meet the uniform spray. At the same time pay attention to the middle and lower blades when spraying.
Fire Protection Equipment Power Monitoring System
Fire Protection Equipment Power Monitoring System,Fire Equipment Voltage Current Signal Sensor,Fire Equipment Power Monitoring Module,Fire Equipment Power Monitor
LIAONING YINGKOU TIANCHENG FIRE PROTECTION EQUIPMENT CO.,LTD , https://www.tcfiretech.com