Whitefly is one of the most harmful pests introduced into China after the American spotted diving fly, which will occur seriously from August to September every year, many crops are seriously affected, especially in the damage to crops while also spreading viral diseases, causing more serious losses, some autumn crops such as tomatoes, zucchini, etc., due to whitefly spread viral diseases, there is no harvest phenomenon. Whitefly is so harmful, and it breaks out every autumn, is there no effective way to prevent it?
First, the harmful characteristics of whiteflies
Whitefly is a pest of the family Whitefly, mainly adult and nymphs gather on the back of plant leaves to suck the sap of plants, due to the tenderness of whitefly, adults mainly harm the strongest leaves of middle and upper photosynthesis, nymphs due to inability to move, mainly in the middle of the plant leaves, so that most of the leaves of the entire plant are affected. Moreover, due to the migratory nature of adult insects, almost all leaves in the upper middle and upper parts have whitefly hazards, which makes it very difficult to control.
Second, whitefly commonly used prevention and control methods
1. Agricultural prevention and control
Mainly including: (1) clean pastoral: before vegetable colonization, timely clean up the weeds on the edge of the field, reduce the habitat of adult insects; (2) cultivate insect-free seedlings: when breeding seedlings, you can add insect-proof nets on the seedbed to prevent adults from entering harmful seedlings; (3) eliminate overwintering adults: before entering winter, add insect-proof nets at the vents of the shed in advance to prevent adults from moving into the shed to overwinter; (4) Yellowboard booby-trap: Whiteflies have a strong tendency to yellow, and can hang yellow plates at the top of peppers, trap adult insects, and the distance between the plates is about 4 meters. Generally, about 20 pieces are placed every 66m2. Due to the limitations of agricultural control, the harm and spread of whitefly cannot be fundamentally and completely killed and controlled.
2, soil treatment: before crop transplanting and colonization or when colonization, 5% of thiazine granules per mu 1 to 2 kg, mix fine soil or organic fertilizer 15 kg for ditch application or burrowing, because thiazine has a good internal absorption conduction characteristics, can be absorbed by the root system after transmission to various parts of the plant, when the whitefly harms it to kill, because thiamethoxen can exist in the plant for a long time, therefore, has a continuous insecticidal effect.
3, chemical control: whitefly propagation speed is fast, field generation overlap is serious, a variety of insect states exist at the same time, prevention and control should generally be mastered in the early stage of occurrence, the following better agents or formulas can be selected: 1.8% avermectin emulsion (30 ml) + 22.4% spironoid ethyl ester suspension (15 ml) + 20% furoteramine soluble powder, mixed with water 30 ~ 50 kg, uniform spray on the stem and leaves of the whole plant; 24% spironoid mite suspension agent 600 ~ 800 times liquid, 30 kg of water uniform spray 50% flurifenonitrile water dispersion granules 3000-3500 times liquid for stem and leaf uniform spraying, 75% avive dipropyclosate dispersible liquid 600 ~ 800 times liquid for the whole plant even spray. 20% furosemide suspension + 1.8% avermectin emulsion 750 times liquid, 22.4% spironium ethyl ester suspension + 1.8% avermectin emulsion 1000 times liquid and other chemical sprays, such as the agent should be sprayed regularly at intervals of 5-7 days and then applied twice. There are many varieties of drugs for the prevention and treatment of whitefly, and the quick-activism is also very good, but due to the characteristics of whitefly, the validity period is very short, and the longest is 15 to 20 days. It is also impossible to fundamentally control the harm and spread of whiteflies.
From the above three control methods, the most effective control method is thiothiazine granule soil treatment, this control method, not only has a long effective period, good effect, but also greatly reduces the number of applications, reduces the cost of investment.
Third, the most effective prevention and control methods
The use of thiamethoxine granules for burrowing, because the thiamethoxine granules in the soil continue to release the drug, after being absorbed by the root system, can be transmitted to various parts of the plant, when the whitefly harm, you can quickly kill the whitefly. It can not only control the harm and spread of whitefly for a long time, but also prevent whitefly from spreading viral diseases, reduce the number of applications, reduce the cost of pesticide investment, and reduce the pollution of agricultural products and the environment, which is worth vigorously promoting.
Fourth, why farmers rarely use it
Soil treatment is the most effective, but why do farmers rarely use it? There are mainly the following reasons:
1, light prevention and heavy treatment: farmers in the prevention and control of pests and diseases there is a concept of heavy treatment and light prevention, do not see insects do not spray, only see the occurrence of pests and diseases, only start spraying the traditional concept of deep-rooted, it is difficult to change.
2, do not know this control: many farmers in the colonization of crops, only pay attention to the application of bottom fertilizer and pay attention to the prevention and control of soil-borne diseases and insect pests, do not know to use thiamethoxine granule soil treatment to control whiteflies.
3, dealers do not have drugs: thiamethoxine granules are the only launched dosage forms in recent years, most dealers only know that there are water dispersible granules, wettable powders, suspended seed coating agents and other spray and seed dosage forms, do not know the use of granules, will not sell granules, farmers simply can not buy.
4, the cost is too high: at present, the unit price of 5% thiamethoxine granules is still very high, and an acre of land needs to invest more than 200 yuan, which is difficult for many farmers to accept and promote.
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