The bud pests of fast-growing poplar are mainly Mongolian weevil, big gray weevil, black velvet chafer, poplar scorpion moth, yang scorpion, white moth, etc., mainly for new planting seedlings.
The control method is as follows: in the germination stage of the seedling, 50% phoxim emulsion, lesburn, chlorpyrifos and other insecticides 1500 times liquid sprayed to kill the adult worm, or use the phorate mixed with poisonous soil to scatter around the seedling root To repel pests.
The main pests of the cockroach are Yang Ganxiang, Populus euphratica, Qingyang Tianniu and A. glabrata. Populus euphratica mainly affects 2 and 3 year old saplings. The control method is: middle and late April, brushing with 1% to 2% solution such as 40% dimethoate, 50% chlorpyrifos, 50% phoxim emulsion, etc. The brush height is about 2 cm. The white-winged moth is mainly caused by 1, 2 years old saplings. During the period from late June to early August, it is sprayed with 1500 to 2000 times of 40% dimethoate, 50% chlorpyrifos, 50% phoxim emulsion. 5 times, each time around 15 days, focus on the spray and the main shoot. Or use an aluminum phosphide tablet to block the wormhole and kill the dry larvae. Qingyang Tianniu mainly damages large trees of 4 years old or older. In the middle and late May, it sprays 80% trichlorfon, 50% dichlorvos, 40% dimethoate 1000 to 1500 times liquid to the branches 1 to 2 times. The A. glabrata is mainly harmful to trees of 5 or 6 years old. It can be controlled in the middle and late April. Drill holes in the dry foundation and reach the core. Each plant is injected with 3 to 5 ml of insecticide, and then the hole is sealed with mud.
Unsaturated polyester resin is a polymer obtained by the polycondensation reaction between polyacids and polyalcohols. The development of water is the by-product of this polycondensation process. Specifically, the Unsaturated polyester resin, also known by the English acronym UPR, is an easily printable liquid polymer which, once cured (cross-linked with styrene, by the use of particular substances, organic peroxides, named hardeners), keeps the solid shape taken in the mold. The items so realized have exceptional strength and durability characteristics. Unsaturated polyester resins are mostly used in combination with reinforcing materials such as glass fibres, that give life to the FRP (an acronym deriving from the English), a polyester reinforced with glass fibres, better known with the name of fiberglass.
Unsaturated polyester resin
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