The pear hibiscus is overwintered by the adults in the leaves of the pear orchard, between the weeds (about 70%) and under the bark. The late February to early March is the peak of the stagnation, the eggs are laid in mid-March, and the eggs hatch in mid-April. At the end of the fall, the first generation of hatching nymphs began to harm. Because the nymphs of P. sylvestris secrete a viscous substance (abbreviated as secretion) when they damage the pear tree, the nymph can be buried within a few days to form a "protective umbrella." First, the reason why pear wood is difficult to cure for a long time 1. Pear è™± å‘作 4 è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± è™± 2. The nymph will secrete a weakly acidic mucus and waxy floc, which is not conducive to pesticide penetration. 3. The late generations of the worms are stacked, the insects are different, the resistance is different, and the scale is wide and it is difficult to fully smash. When the pear flower falls 95%, it is the peak period of the pear hibiscus. In June and July, it is a severe period. The key to prevention and control in this period is to first remove the acidic secretions, so that the acidic mucus on the pear hibiscus will fall off, lose the "protective umbrella", and then use 3% avermectin 3000 times + 35% pyridine 1000 times + 2.5% cyhalothrin When the ester is sprayed with 1500 times, the pear hibiscus can be effectively killed. Second, prevention and treatment measures According to the author's many years of prevention and treatment experience, only need to catch four key periods of spraying control, it can effectively kill it. The first critical period: the overwintering adult worms are in full bloom, and the time is in late March (the pear tree buds are swollen until the buds bloom). At this moment, about 70% of the adults of P. sylvestris have emerged, and the adults and eggs are exposed on the branches. The drugs can be applied directly to the worms, and the conventional insecticides are used . The effect is remarkable. The second critical period: the first generation of nymphs will gather episodes, and the time will be about 95% of the fall of pear trees in mid-April. At the moment, it is worthy of many breeding episodes of pear bifurcation and many hatching periods of wintering eggs, which is a favorable opportunity for chemical control. The pesticides that can be used together to control pear hibiscus and pear bifurcation were selected. After 7 days of application, the rate of pear mites decreased by more than 70%, and the mortality rate of hibiscus was over 80%. The third critical period: the first generation of adults emerged during the peak period, and the pear tree fell for 1 month in mid-May. At the moment, the first generation of adult larvae is in the stage of emergence, most of which are in the nymph stage of the first instar, no secretions are produced or rarely, the insects are exposed, the medicinal agent can touch the worm, and 3% avermectin 3000 can be used. Double or 2.5% beta-cypermethrin 2000 times solution, killing nymphs and adult worms, the insecticidal effect of more than 90%. The fourth key period: the prevention and control of pear hibiscus after defoliation, the first three points should be grasped: After the deciduous leaves, the insects are in common before the sputum, and the rest and wintering places gather, which is convenient for selecting medicines and determining the scale of medication. In the late autumn, the pear wood is afraid of cold and unwilling to move, and it is almost not very beating, which is conducive to the powerful killing effect of pesticides. After the fruit trees are deciduous, the pear wood mites are exposed, which is convenient for detailed spraying and can reduce the dosage. Special attention should be paid to the quality of the spray during the prevention and treatment, so that the spray of the liquid is even, thoughtful and detailed, especially between the base of the leaf clump and the leafhopper to kill the small nymph resting in these shades. Integrated All In One Solar Light Integrated All In One Solar Light,All In One Solar Light,Integrated Solar Street LED Light China Searun Solar Solution Co., Ltd. , https://www.searunsolar.com