Coffee black helmeted borer is distributed in Hebei, Beijing, Henan and other places, mainly harming acacia, cycad, osmanthus and so on. Nymphs and female adults sting the sap of the host petiole, leaf, and branch, and secretions induce coal pollution. The affected plant has yellow leaves and falls early.
Black helmeted insects cause coal pollution disease
[1] Morphological characteristics
The eggs are oblong and oval, yellowish-white at first birth, and gradually turn orange-yellow and red. When the nymph hatches, the body is oval, pale yellow or pale orange-red, and reddish-brown spots appear on the dorsal surface. Female adults are ovoid, juvenile and pre-ovate flattened, pale yellow or red, dark spots, often have "H" stripes on the back of the body, mid-red to light brown, have many uniform light-colored dots on the back of the body, softened white after spawning, hardened yellowish or black brown, shiny, smooth and upwardly raised on the back, highly hardened, sideways oblate hemispherical, or oval,shaped like a steel helmet.
【2】Biological characteristics
Beijing occurs 2 to 3 generations a year, no male insects, parthenogenesis, outdoor can not overwinter, greenhouse perennial hazards, no obvious overwintering phenomenon. Late April, late July, and late December (greenhouse) are the peak periods for each generation of nymphs, the hatching nymphs inhabit young branches and leaf backs, the first generation of nymphs secrete wax after fixation, about 10 days the body is covered with a transparent thin waxy layer, about 1 month the insect body grows significantly, and then gradually expands into a hemispherical shape.
[3] Prevention and control methods
1. Use a toothpick to remove the insect body when it occurs.
2. Pay attention to ventilation and light transmission in the greenhouse.
3. Protect natural enemies such as wasps and red-spotted ladybirds.
4. Use qilin "strike" or "qifa" for spray prevention and control during the occurrence of pests.
5. Root application of "eradication of insects" can achieve effective prevention and control.
