On March 11, during the investigation of orchard diseases and insects, it was found that the number of eggs in the pear lice field increased significantly compared with March 7, and the average number of eggs in 100 branches was 645 more than that on March 7, 290 more than the 355 on March 7. At present, there are many adult insects in the field, and in addition to the bud marks at the egg site, there are also many eggs in the bud eye, leaf marks, etc., and it is expected that the number of eggs will continue to increase in the near future. Control of adult pear lice and eggs should be carried out immediately.
Pear lice is one of the main pests that harm the pear tree, the annual occurrence is closely related to the rainfall, the rain occurs lightly, the drought occurs heavily, the pear blossom bud spit white for the first generation of egg emulsification peak, after 1 to 2 days that is, from the tail secretion of colorless transparent line, wax attached to it, the secretion of the liquid will be wrapped in the insect body, this is the pear wood lice difficult to prevent the place, adult insects mainly harm the pear tree branches, buds, leaves, stinging sap, all by the pear tree lice thorn sucked the place are blackened, if the prevention and control is not timely, Seriously affecting the rate of pear fruit commodity secretions in the later stage of the leaf back is black star disease, the best nutrient for black spot disease, if the late rain is sufficient, can cause early large leaves.
Pear wood lice nymphs, adult insects mainly harm pear leaf leaves, buds, flower buds, fruit stalks, fruits, young branches, sap sucking, secrete a lot of mucus, attract aphids and coal pollution bacteria. Once it breaks out, the mucus secreted by the pear wood lice will envelop the worm body, and the liquid cannot penetrate into the worm body, so it cannot kill the pear wood lice. Any place that has been kissed by pear wood lice will be blackened, and if the prevention and control is not good, it will seriously affect the rate of pear fruit commodities.
First, pear lice control methods and two key periods:
1. Physical Clearance Garden
In early spring, the dead branches and leaves of the pear orchard are cleaned, the old warp skin is scraped, buried or burned deeply, and the overwintering latent disease and insect eggs are eliminated to reduce the base.
2. Chemical Clearance Garden
(1) About a week after the sting of the branch tree, select the temperature of about 20 degrees Celsius and carry out a comprehensive removal of the trees under the trees in the whole garden. Branch Qingyuan plan: 4000 stars + 1500 times Long Lile + 8000 times force.
(2) After the expansion of pear blossom buds, the whitening period is the peak period of overwintering adults, and it is also the early stage of the emergence of the first generation of eggs, which is the first key time for chemical control.
Flower dew white period scheme: 8000 times star + 8000 times hailiang + 8000 times thunderbolt horse + 8000 times silk.
Special reminder: Using the yellowing characteristics of pear wood lice, 8 to 10 yellow insect trap boards are hung on the acre to trap pear wood lice.
(3) The first post-flowering drug is at the end of the pear tree bloom, that is, when 80 to 90% of the pear blossoms fall off, it is the peak period of the first generation of nymph hatching, and most of them do not secrete mucus, which is the second critical period of chemical control.
The first drug scheme after flowering: 3000 times of qianlu + 4000 times of helioethyl ester + 2500 times of red + 2500 times of machete + 1500 times of Megame + M-JFN1500 times.
(4) May to September is the serious occurrence of pear lice, if the first two key control times are not well controlled, may to September pear lice generation overlap, nymphs secrete mucus, adult insects fly when they are medicated, it is difficult to control. If there is a lot of secretion, you can spray 0.3% laundry detergent alone, wash off the secretion and spray it.
Second, the difficulty of pear lice control:
1. The prevention and control time is not well mastered, and the best prevention and control period is often missed;
2. Pear lice have a large amount of eggs, fast reproduction speed, and strong resistance to conventional drugs;
3. Adult pear fungus can fly and fly away as soon as it is sprayed.
4. Nymphs secrete mucus, and it is difficult for the liquid to penetrate into the mucus.
Third, spraying precautions:
Growing season, pear lice eggs are mostly in the gaps in the buds, nymphs are mostly gathered in the young shoots, leaf backs, petioles, the lower part of the fruit calyx harm, the insect body is small, the harmful parts are hidden, it is difficult to take medicine, so that each spray must add "silk run", so that the diseases and insects have nowhere to hide!
Mu with 500 pounds of liquid medicine, with atomized three spray heads, spray up and down buckles, spray wet spray throughout, leaving no dead ends!
Author: Gao Liming, lecturer at Zhongnong Le Fruit Industry Research Institute
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