Cossus cossus L. is also known as poplar cocoon moth and red-harex insect, and it is distributed in northeast China, north China and northwest China. The host has walnuts, apples, pears, peaches, apricots, and poplars, willows, sorghum, birch, coriander, and hazel.
The characteristics of the damage?? The larvae in the xylem surface into a trough pit. More than 10 heads or dozens of larval colonies are common at this stage. When the worm age increases, they often disperse in the same section of the trunk and feed on the pith, gradually forming a thick and irregular tunnel. Can be secreted as a liquid with aromatic odor, hence the name.
Morphological characteristics??
Adults: The whole is taupe with a darker belly. It is about 30 mm in length and 56-80 mm in wingspan. Female moths are larger than male moths. Antennae dentate. Compound eye dark brown. The forewings are grayish white, grayish-brown on the leading edge, and densely brownish wavy stripes. There is a thick, distinct ripple from the trailing edge to the leading edge.
Eggs: First produced near white, dark brown before hatching, nearly ovoid, 1.5 mm long, 1.0 mm wide, egg surface with longitudinal ridges, with transverse lines between the ridges.
Larvae: Flat cylindrical, 3-4 mm in length at the time of initial hatching, 56-80 mm in length at the end of the age, red or purple eggplant on the back of the chest, shiny, yellowish or light red on the ventral surface. The head is dark purple with irregular fine lines. There is a pair of large purple-brown stripes on the pronotum.
茧: Long cylindrical, slightly curved. It is 50-70 mm long and 17-20 mm wide. It is composed of soil particles before the old larvae are introduced into the soil. False flat round, about 40 mm long, about 30 mm wide, and 15 mm thick. It is composed of the last-instar larvae that have been removed from the hole and spit to the front of the knot. The texture is loose?
Life history and habits?? Aromatic wood moths in Henan, Shaanxi, Shanxi, Beijing and other places to complete a generation of 2 years, completed in Xining, Qinghai, 3 years. The larvae winter in the soil near the base of the damaged tree and the base of the trunk. Winter mature larvae phlegm in April-May, and adults emerged in June-July. Adults are more active at night and have phototaxis. Eggs are produced at 1.5 meters below the base of the trunk or cracks or edges of the root and stem junctions. Each female lays an average of 245 eggs. The eggs form a mass. Each egg generally has 50-60 eggs. The few are only a few, and more than 100 can be obtained. After hatching, the larvae drill into the cortex from the wounds, cracks in the bark, or old boring holes to discharge finely divided brown wood chips. The larvae first feed under the cortex, separating the xylem from the cortex, and easily peel off, forming a trough-like pit on the surface of the xylem. More than 10 heads or dozens of larval colonies are common at this stage. When the worm age increases, they often disperse in the same section of the trunk and feed on the pith, gradually forming a thick and irregular tunnel. In October, it will be wintering in the tunnel. In the following year, the larvae continued to be harmed. From late September to early October, the larvae were mature and climbed out of the tunnel and knotted in the soil about 10 centimeters deep in the roots or a few meters away from the trunk to the sun. The mature larvae crawl faster and encounter disturbances that can secrete a liquid with aromatic odor, hence the name.
Prevention methods? 1, in the adult spawning period, the trunk coated with clay agent to prevent adult spawning.
2. During the 5-10 larval feeding period, use the 40% Dimethoate emulsion 25-50 times to inject the hole once. Note that the liquid efflux, and then sealed with mud, can kill dry larvae.
3. When larvae are found in the subcutaneous part of the neck, the cortex can be picked up to kill the larvae.
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