Talking about the control of sycamore planthopper

Chinese parasol tree is one of the main urban landscape tree species in north China. Its trunk is tall and straight, its leaves are beautiful and its shading effect is good. However, the damage of Chinese parasol psyllid is great, which greatly affects its ornamental effect. After long-term observation, garden staff gradually found out the occurrence and development rules of Chinese parasol psyllid, and carried out effective control, accumulated certain experience, is introduced as follows, for reference and reference.

I. Hazard characteristics and symptoms

Sycamore psyllid, also known as sycamore split head psyllid, is a homoptera psyllid family. The nymph and adult suck the sap on the leaves or young branches of Chinese parasol, especially the young trees. The white cotton floc wax secreted by the nymph blocks the stomata of the leaves, affects the normal photosynthesis and respiration of the leaves, and makes the leaves appear pale and atrophied. Secretions contain sugar, but also often induce mold parasitism, serious harm, leaves fall early, branches dry, rough skin fragile, vulnerable to wind break.

II. Morphological characteristics

Female adults are yellow-green, 4 to 5 mm long, wing span about 13 mm, compound eyes dark reddish brown, antenna filiform, yellow, the last two black. The egg is slightly spindle-shaped, with one end slightly pointed, about 0.7 mm long, yellow-white or yellow-brown at the beginning of production, and turns reddish brown before hatching. The last instar nymph is slightly cylindrical, covered with thick white wax, all pale and slightly green, and 3.4 to 4.9 mm in length.

III. Life history and habits

In Weifang area, Shandong Province, this insect has 2 generations a year and overwinters with eggs. The overwintering eggs begin to hatch at the end of April and the beginning of May of the next year. The nymph stage lasts more than 30 days. Emergence began in the first and middle of June, and reached its peak in late June. The second generation of nymph hatched in mid-July and emerged in early and mid-August. In late August, the second generation of eggs begins to hatch. The occurrence period of this insect is very irregular, and various insect states can be found at the same time.

The adult and nymph of the insect are clustered, often more than ten to dozens of heads clustered on the tender shoots or branches, and mainly on the tender shoots and leaves. The nymph stage insects are gregarious in waxy floc, the insect moves quickly, no jumping ability. Adults always crawl after emergence, rarely fly, if disturbed, jump to help fly. Jumping distance can reach more than 33 cm. The flight is weak and rarely flies 2 meters away. Adult emergence, after about 10 days of supplementary nutrition, before mating eggs. The copulation occurred before 8:00 and around 19:00. Spawning begins 2 to 3 days after mating. The eggs are laid on the shady side of the main branch near the trunk, on the back of the leaf or on the petiole, but the position of the eggs laid by the first and second generation adults is different. The first generation is mainly laid on the back of the leaf, and the second generation is laid on the branch. The eggs are scattered and each female can lay about 50 eggs. The egg period is 10 to 12 days. Adult life span is about 42 days.

IV. Control methods

1. Spray clean water to wash away flocs during the harm period, and many nymph and adult insects can be eliminated.

2. Spraying 40% omethoate EC 1000 times solution to control adult and nymph.

3. The trunk injection of monocrotophos at 1∶15 times of 40% solution at the early instar or large-stage of nymph was very effective.