Myzus persicae is the most vicious pest of fruit that harms the chestnut fruit. It occurs in 2 to 3 generations per year in North China and is more than 3 generations. The first-generation larvae jeopardize plums and premature peaches; the second-generation larvae jeopardize corn, sunflower flower disks, castor bean flower spikes, and late-maturing peach fruit; third-generation larvae mainly harm chestnuts. The adults of Myzus persicae began to lay eggs between the acupuncture of Lianteng from late July to early August. The formation and harvesting of Lithocarpus were affected by larvae of different ages. serious. After the chestnut fruit is harvested, the larvae enter the fruit farm and fruit store together with the fruit, and from this fruit to the fruit.
After finding out the pattern of occurrence of peach aphid, we must also look at the method of harvesting chestnut fruit. Collecting chestnut fruit in North China adopts the methods of picking down chestnut and playing Pengpang. Picking down the chestnut method is more time-consuming, but it can greatly reduce the damage of the peach plant. Limpa implosion law created conditions for the damage of peach aphid. Because the chestnuts are piled up, their breathing increases and their fever rises. The larvae that had originally drilled into the chestnut tentacles climbed after they had been heated, and to prevent the high temperature from affecting the quality of the chestnuts, they had to lower the temperature by pouring water into the puddles. Then they climbed out. The larvae also got into the chestnuts. Instead of drilling into the original worm fruit, it drills into another chestnut fruit. This way, after climbing out and drilling it several times, the rate of larvae will increase greatly. Therefore, prevention and control of peach aphid must take comprehensive measures.
First, the chemical control Su Peng harvested after the peach aphid piled up during the accumulation of chestnuts a lot of chestnut fruit, especially when the pile temperature rises, a large number of damage when the erosion and cracking. Therefore, this period is a crucial period for controlling the damage of peach aphid. In case of cracking and stacking, the trichlorfon crystals with a content of 90% should be added with 1000 times of water and evenly sprayed on the chestnuts. With the spray, the dosage should be 25% to 30% of the weight of the chestnuts, which can reduce 80 percent. % of worm fruit rate. Or put the chestnut into the basket; soak it in the cylinder of the liquid and put it on the heap. The effect is very good.
Second, promptly threshing Lithocarpus harvest, accumulation of 5 to 6 days, when the chestnut most of the cracking, larvae have not yet entered the chestnut fruit, should seize the time for threshing, can reduce the rate of 40% of the fruit.
III. Eliminate the overwintering larvae After the harvest of the peaches in September and September, strictly remove the fruit and prevent the larvae from escaping and spreading. Before winterizing the adult worms, thoroughly handle overwintering hosts such as sunflower disk, corn stalks, and chestnut awnings; and eliminate overwintering larvae in winter in warehouses. .
Fourth, trapping and killing adults in the chestnut properly set black light outlets, trapping adult worms, the effect is also very good.
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