Three measures to prevent and control diamondback moth

Because the diamondback moth has many generations, high reproductive rate, overlapping generations, and extremely strong resistance to drugs, many pesticides have poor control effect against Plutella xylostella, which makes the vegetable farmers have a headache.

To effectively control and control the diamondback moth, the author has conducted comprehensive measures for prevention and control of three measures in Guangping, Cheng'an, Pingxiang, Qinghe, Jingxian and other places in recent years.

The first is a reasonable rotation to reduce the number of insects. The implementation of cruciferous vegetables and melons, solanaceous vegetables or onions and garlic vegetables rotation, after harvest, timely treatment of stubble leaves, to eliminate a large number of insect sources.

The second is to trap adult worms and reduce spawning. Using the phototaxis of Plutella xylostella, black light traps were placed during the adult stage to reduce the number of eggs laid.

The third is the scientific use of drugs to improve the effect of pest control. The diamondback moth (Plutella xylostella L.) is one of the most serious pests in China and has developed resistance to most commonly used pesticides. In addition, phoxim, dichlorvos, methomyl, and their compound preparations are highly susceptible to phytotoxicity on vegetables, and they must be avoided. According to the results of the field experiments, each sprayer used Japanese imports of trifluoromethyl pyridoxine 15 to 20 milliliters, or even sprayed 10 milliliters of water to the "Cangke 140". After 30 minutes of application, it can be effective. Dead insects can be seen on the day. The next day can reach the peak of dead insects, control effect of 79% to 95%, the field actually effective period of up to 10 to 15 days. Based on comprehensive considerations such as price/performance ratio, the cost of the “Zhanke 140” is relatively low, and it can also treat various species of pests such as Thripidae, Bemisia tabaci, Liriomyza spp. Therefore, it is recommended to use the drug "Zhanke 140" as the main drug, which can be alternately used with other pesticides to slow down the development of drug resistance and improve the effectiveness of pest control.

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