Experience of Pesticide use in pollution-free Strawberry production

I. strict selection of pesticides and strict enforcement of pesticide safety intervals

In the production of pollution-free strawberries, biological pesticides should be given priority, and chemical pesticides with high efficiency, low toxicity and low residues should be selectively used. These pesticides are mainly ⑴ insecticides, such as Bt series, avermectin series, pyrethroids, plant extracts (such as bitter lipids, capsaicin, etc.), insect hormones (Miman, Cardamole, Yitaibao), a few organophosphorus pesticides (trichlorfon, Lexben, Nongdile) and other pesticides such as imidacloprid, etc. ⑵ fungicides, such as Bordeaux liquid, doxorubicin, methyl topiramate, Shigao, Fuxing, Kesha, chlorothalonil, Teflon, Baikor, pyrimidine, etc. ⑶ herbicides, such as Caoke, Gengcao, etc. ⑷ aerosol, such as sulfur fumigant, Sukeling, aphid fumigant and so on. In the whole production process of strawberry, the use of high toxic and high residual pesticides such as methamidophos, carbofuran, chlordimeform, omethoate, triclofenac, methyl 1605, pentachlorophenol sodium, clenane, chloropicrin and herbicide is strictly prohibited.

The pesticide residue of strawberry fresh fruit is closely related to the time from the last application to harvest. If the interval is short, the pesticide residue will be more, and vice versa. Therefore, producers must strictly grasp the safety interval of all kinds of pesticides. Generally, strawberries can only be harvested and put on the market at an interval of about 10 days before or after using strawberries. for pesticides with a long residual period, such as imidacloprid, fresh fruits can be harvested and put on the market more than 15 days after use.

Second, pay attention to prevention and control strategies and accurately grasp the appropriate period of prevention and control

The principle of "controlling one and pressing two" should be grasped in the control of Spodoptera litura and other insect pests, that is, the base number of pests in the first generation should be depressed by the second generation, and at the same time in the evening. The prevention and control of red spiders should be mastered in the occurrence stage. The occurrence of strawberry virus disease is closely related to aphids. As long as aphids are well controlled, the incidence of strawberry virus disease can be significantly reduced. At the same time, according to the occurrence of diseases and insect pests in the field, it is very important to choose the way of pesticide application accurately. If there is no universal treatment for those who can be treated, and those that can be treated locally, never universal medication should be used.

III. Appropriate, alternate and scientific use of drugs

Some producers have some misunderstandings in the use of drugs. they think that the greater the dosage, the better the efficacy of insecticidal or disease treatment. In fact, this not only increases the cost, but also easy to cause drug damage. Therefore, what medicine to use and how many doses to use should be strictly controlled. In addition, one of the effective ways to overcome and delay drug resistance is to use more than two kinds of pesticides with different mechanisms alternately, and pay attention to the alternative selection of pesticides without cross-resistance.