The beautiful cedar tree is a common ornamental tree planted in Beijing. In recent years, there has been a huge slump on the cedar in Beijing, and it has taken place in autumn and winter. According to experts from the Institute of Plant Protection and Environmental Protection of the Beijing Academy of Agriculture and Forestry Sciences, this locust is a new record in China and is called cedar. In recent days, Cedars have grown into a peak period in this city. The main symptom is that the aphids secrete a large amount of honey dew, and the cedar branches, ground cover plants and honey are exposed on the ground, contaminating the lower branches and leaves of cedar trees and the underlying Ground covers and grounds should be monitored and controlled. Morphological characteristics Wingless orphan females: body length 2.9-3.7 mm, pear-shaped body, deep copper brown, black spots on the abdomen with paint, light brown cilia and white wax powder on the body surface, and a longitudinal groove on both sides of the center of the head; On both sides of the backboard, there is an inclined depression, which is in the shape of an "eight"; in the center of the midline of the chest and abdomen, there is a protrusion in the center and a blunt tooth; the abdomen is short. Winged female: similar to wingless orphaned female, with 2 pairs of wings. Winged male dragonfly: body length 2.2-3 mm, head and chest black, compound eye red, tentacles grayish brown, base 2 and dark brown end; abdomen gray brown or gray-green, dark brown or gray-brown foot; long, can be At the end of the abdomen. Eggs: 1.05-1.25 mm in length and 0.47-0.52 mm in width; yellowish-brown at the time of first production and later turned black. If 蚜: body length 1.2 mm, antennae 5 knots (less than 1 knot). Biological characteristics Alone and alternate generations, alternating with multiple generations of cedar twigs 2.5-40 mm in diameter, often cause a large amount of honeydew to drip on the foliage, ground cover, or ground beneath the victim tree; it begins in late August, 11 In the middle of the month, winged females, winged females and wingless females (females) were mixed; sexual females spawned on the shoots of needles, 2-8 were arranged in rows, and occasionally eggs were laid on branches. . Control methods 1. Scrape aphids on branchlets and remove oviducts in winter. 2. In the event of damage, use 10% imidacloprid wettable powder or 1.2% nicotine matrine spray to control. 3. Protection and utilization of natural enemies such as ladybugs, grasshoppers, and hoppers. (Guan Ling is a member of the expert advisory group of the newspaper)
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