The autumn stage of hibiscus is an important period of hibiscus, and citrus hibiscus is the only medium for citrus Huanglong disease to spread in the field. The agents can be high chloride, thiamethoxam, imidacloprid and acetamiprid.

If the early management of Red Spider Red Spider is not good, it will have a peak period in the near future when it is ripe. It is recommended to use avermectin: avermectin, etoxazole, bifenazate, butyrate, snail Ester, fluazinam.

The control of rust spider rust spiders is to grasp the drooping branches and the hidden branches. These dark parts should be sprayed with the medicaments Avi·Urea and Dingbucarb.

The latent leaf moth of the leaf miner is inoculated into the mesophyll during the young leaves, and it is also necessary to seize the time to spray the medicine. The avermectin, thiamethoxam, thiacloprid and imidacloprid can be used to prevent the reduction. Ulcer disease.

The Lepidoptera pests, Spodoptera litura, and the genus Papilio are all leaf-eating pests. Feeding the leaves during the young shoots causes the new shoots to be irregular or the photosynthesis of the leaves is poor. You can choose a vitamin salt + chlorpyrifos and a chlorpyrifos.肼, 虱螨 urea, etc.

Ulcerative ulcer disease is currently a headache, it is best to spray a copper preparation and other fungicides , and then treat the diseased branches, effectively sealing the ulcer bacteria, while avoiding cross-infection. The following agents can be used, thidium copper + chunleimycin, copper hydroxide, thiabium copper + chrysanthemum.

Lipid maculopathy, maculonosis, mainly occurs after the autumn shoots are matured, and can be controlled with mancozeb + benzyl azoxystrobin.

In terms of building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, and fibers, PVC was the world`s largest production of general-purpose plastics, and its applications are very widely. Widely used in all aspects.

PVC is a white powder with an amorphous structure. The degree of branching is relatively small. The relative density is about 1.4. The glass transition temperature is 77~90°C. It begins to decompose at about 170°C. It has poor stability to light and heat. After prolonged exposure to sunlight, it will decompose to produce hydrogen chloride, and further automatically catalyze the decomposition, causing discoloration, and the physical and mechanical properties also rapidly decline. In actual applications, stabilizers must be added to improve the stability of heat and light.

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