Sangbai scale insects, which are harmful to a variety of fruit trees, spread widely, and have many episodes. The female adults and nymphs are clustered on the branches to bite the nutrients. When the grim, the gray-white shells overlap, forming the surface of the branches. The tree is weak, the number of dead branches increases, and even the whole plant dies.

First, the morphological characteristics:

The female adult is orange-yellow or orange-red, with a body length of about 1 mm. The broad ovoid is flat and flat, and the tentacles are short and degenerate into a tumor-like shape with a thick bristles. The female capsule is nearly round, 2 to 2.5 mm in diameter, slightly raised, with a spiral pattern, grayish to taupe; the shell is yellowish brown, at the center of the shell.

The male body is 0.65-0.7 mm in length and has a wingspan of 1 to 32 mm. Orange to orange-red, slightly long and simple. The shell is about 1 mm long, slender white, and has three longitudinal ridges on the reverse side. The shell is orange-yellow and is located at the front end of the shell. Egg: Oval, primiparous pale pink. The mutation is light yellow and orange-red before hatching. Nymph: 0.3 mm in length, the newly hatched nymph is yellowish brown and flat oval.

Second, the law of occurrence:

In the north, two generations occurred in one year, and the second-generation fertilized females overwinter on the branches. Before mid-March in early spring, the peach tree sprouted at the beginning and bite, the insect body swung agilely, and began to lay eggs in late April. At the end of April and early May, it was the peak of spawning. The female died after the spawning. The egg period is about 15 days, and in mid-May (the large-scale shedding period of Gangshan white peach buds) is the egg-forming period. It begins to emerge in mid-June and is in the late stage of emergence. After the mating, the male died, and in mid-July, it was the peak of spawning. At the end of July and the beginning of August, it was the peak of hatching. When the nymph was damaged, it began to emerge in the middle and late August. After the mating, the female continued to harm until the end of autumn.

After the nymphs hatch, they climb out from the mother's shell and are fixed on the 2 to 5 year old branches. The branches are denser and the density of the shade is larger. After 5 to 7 days, the hairy white wax powder was secreted to cover the body.

Third, prevention and treatment methods:

At that time, it was still based on chemical control of nymphs during the handling period, combined with other methods for inductive control.

1. Artificial control. The worms on the branches can be brushed off with a hard brush or a thin copper (steel) wire. Combined with trimming, cut off the severely damaged branches.

2. Chemical control. If the nymphs are transported, (in the middle of May), spray 50% mixed emulsion 800 times solution or 0.2% to 0.3% Baumeite sulphur mixture, mix other insecticides with clay oil emulsion containing 0.2% to 0.4% oil. The agent can increase the efficacy and extend the spraying period.

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