Thrips are one of the five small agricultural pests (five small pests are mites, aphids, mesozoans, whiteflies and psyllids, and thrips). In previous years, due to the relatively mild occurrence, it could not constitute a large-scale hazard, and it was often ignored by fruit growers. However, with the increased resistance of thrips in recent years, single use of drugs, mixed crops, changeable climate, etc., unconsciously thrips have become the most headache pest for mango growers (especially in Hainan mango producing areas), and there is no one, which poses a great threat to mango production. It is important to scientifically understand thrips and take appropriate prevention and control measures.
(Thrips harm young fruits causing "pockmarks")
1. Harmful symptoms
Thrips are mainly harmful in mango shoot, flowering and young fruit stages. Thrips are good at sucking young tissues, after sucking the sap of young tissues, the endangered surface of small bumps cause rough phenomenon, the young shoot stage is seriously harmful, resulting in rough leaves becoming smaller, and even deciduous; when the harm in the young fruit stage is serious, the mango completely loses its commerciality. At the same time, it is worth noting that the less harmful one is also one of the possible reasons for the "dew spots" and "age spots" in the later stage of mango fruit.
2. Occurrence law
The chronological algebra is unknown. When the temperature is high, it takes more than 10 days to complete the first generation. Adults and nymphs can be harmful to leaves and fruits; the color of the affected leaves is lighter, like hot water burns; in the mango fruit soybean size, there is this insect pest, the appearance of the affected small fruit is brown, showing brown linear lines or markings, when the harm is serious, the small fruit can be dried up, and the fruit surface becomes rough when the fruit is picked, thereby reducing the value of the commodity. At the same time, because of the flight habit of thrips and the fact that the insect body hides under the leaves under high temperature conditions, it is difficult to control it.
3. Prevention and control methods
(1) Physical methods can be lured by yellow/blue plates;
(2) Often observed in the park, the young leaf stage, the initial flowering stage, the full flowering period can be observed at any time through naked eye observation and jittered inflorescence, etc., and the control effect is better before the completion of the generation change;
(3) You can choose imidacloprid, acetamiprid, and pyrazidone. Acetamidine, when severe, can be compounded with avermectin, methylphenidate, etc. for prevention and control, it is recommended to rotate medication and unified prevention and control.
Article source: Guoguang Agrochemical Author: Zhao Suncai
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