1, avermectin
In the early stage of the occurrence of B. tabaci, it is sprayed with 1.8% avermectin EC3000-4000 times, usually sprayed once every 3-5d, and even 3-4 times, which can achieve good control effect. After applying 1.8% avermectin 3000 times solution, the control effect was the highest at 7 days, which was over 90%.
2. Buprofezin
Buprofezin is often used as a foliar spray. In the period of the young nymphs of B. tabaci, the spray is evenly sprayed with 25% wettable powder 2000-3000 times, which has good control effect. The use of 125-250mg / L concentration in the field can effectively control the harm of B. tabaci. In the comprehensive control of cotton, the control indicators of insect growth regulators are 0.5-1.0 old nymphs/leaves and 3-5 adult/leaves.
3, mosquito fly ether
Mosquitoes are mainly used as foliar sprays. Immersion of 0-1d eggs with 0.1mg/L solution can make 90% of the eggs not hatch, but with the increase of egg age, the degree of inhibition is reduced; the female adults are exposed to the cotton or tomato treated with the drug solution. Seedlings, eggs can not be hatched completely; treatment of nymphs with a concentration of 0.04-5mg / L, no effect on the normal growth of 1-3 instar nymphs, but can significantly reduce the amount of honeydew secretion of the last nymph, and completely inhibit adult form.
4. Imidacloprid
Imidacloprid can successfully and effectively control Bemisia tabaci, and since 1991, imidacloprid has been applied to vegetables in southern United States. China developed imidacloprid in the early 1990s and registered production in 1992. Since 1996, the production of imidacloprid has been on a rapid rise. Although Bemisia tabaci has been reported to be resistant to imidacloprid and its similar nicotinic pesticides in the world, imidacloprid and its similar nicotine pesticides are still the most important pesticides for controlling whitefly in vegetables and ornamental plants. .
5. Other
In addition to the above-mentioned pesticides , there are some newly developed new pesticides with potential for development in the control of whitefly. For example, spiromesifen is a neonicotinoid pesticide invented by Bayer, which is extremely effective against whitefly and mites. Fluorylurea (novaluron) is an insect growth regulator (IGRs) and a chitin synthesis inhibitor. It has excellent effects on eggs and nymphs of B. tabaci, and it is safe for parasitic wasps. Another important pesticide. In China, some new insecticides have been introduced for the potential application of Bemisia tabaci, the most notable of which is diafenthiuron, also known as chlorpyrifos, which is more active than nymphal nymph. It has strong activity against ticks or eggs, low toxicity to mammals, and almost no toxicity to natural enemies and pollinators.
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