The Drosophila scale insect is a sucking mouthpart pest that damages trees with nymphs and female adults. It is mainly harmful to pears, apples, peaches, dates, persimmons and other fruit trees. In recent years, there have been several counties and cities in northern Jiangsu.
First, generations and living habits
1, generations and life history. Grassweed only occurs in one generation in one year and it is wintering with eggs in the clods and cracks under the canopy and rotten grass. In general, the hatching of the nymph begins in mid-February and the tree is harmed. After the male matures, it is under the tree and lurks in the soil and cracks. The females continued to jeopardize the tree from May to June. After the males emerged, they flew to the trees for mating. The males died after the mating was completed. The females drilled into the soil or cracks in the trees and spawned in the rotten grass, and gradually dried. Shrinking death.
2, living habits. Nymphs like to cluster damage in hidden places, especially like sap in shoots, buds, etc. Generally less active before 3 days of age, more lively after 3 days. In the cracks or under the tree canopy, rotten grass, phlegm, spawning and so on.
Second, control methods
1, physical control. Clear garden, frozen hoe. That is, after entering the fall of the fruit trees in autumn and winter, immediately organize the cleaning of leaves, rotten grass and other debris, burn them together to destroy the eggs. And in the tree disk soil thawing, digging eggs crushed and frozen to death.
2, chemical control. In late January, a special person was organized to carry out investigations and forecasting. Using the nymph's flocks, when the nymphs were newly unearthed and were not harmed by the trees, they were sprayed with 1,000-1500 times of the enemy insecticide and other highly effective insecticides, or used 3- 5 Baumeide's lime sulfur concentrate was sprayed and sprayed. One week after spraying, only sporadic grass clippings were found to be harmful. The effect was very obvious. Due to the different incubation period of grass lice nymphs, it is best to spray 2-3 times within 1 week.
3, comprehensive prevention and control. Before the nymph is unearthed, the tissue is manually removed from the base of the tree trunk (about 50 cm above the ground) and the skin of the trunk is scraped off (up and down height is about 20 cm), and a wide tape is wrapped around the scraping skin, and the upper and lower tapes are respectively tied. The venom of the adhesive was used to prevent the nymphs from harming the tree, and then the nymphs were sprayed under the tree tray. Adhesives are generally formulated in a ratio of 2:0.5:1 with butter, enemies, and waste engine oil, or formulated in a ratio of 1:1 with diesel oil and rosin powder.
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