Prevention and control of copper green beetle
The main results are as follows: (1) artificial control: the adults are caught and killed by the combination of artificial shock trees and out-of-garden light in the evening.
(2) Chemical control: in the initial stage of adult occurrence, 2.5% trichlorfon powder was sprayed on the orchard tree plate with high population density and mixed with a shallow hoe to kill the unearthed adults; before dark, the trees were sprayed with 2000 times of 80% dichlorvos EC, 2000 times of fenvalerate EC, and sprayed once more in 7 days (avoiding flowering) to control the damage. Other beetles can refer to prevention and control.
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Key points of cultivation techniques of parent fish in winter
The cultivation of parent fish can be divided into postpartum nursing, autumn cultivation, winter cultivation and spring cultivation. Due to the low temperature in winter, the activities of parent fish are reduced, the feeding ability is weak, and fish diseases are easy to occur. If it is poorly managed, it will have a great impact on artificial hatching, fry production, adult fish culture and other production links in the coming year. The main technical points for the cultivation of parent fish in winter are as follows: first, the selection of parent fish pond requires sufficient water source, flat bottom, shelter from the wind and sun, water conservation and heat preservation, with an area of 10 Mel and 15 mu. two
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Fish species released in autumn and cultivated in autumn to keep them alive
Strengthening the cultivation of fish species in autumn is the key to improve the survival rate of overwintering fish species. Improve the environment before the release of fish species, release half of the original pond water, and then add new water. 150 kg fermented manure was applied per mu pond, once every 9 days, for a total of 3-5 times. Appropriate topdressing of chemical fertilizers based on nitrogen and phosphorus, generally 1.5-2.5 kg of urea and 3-5 kg of superphosphate per mu of pond, about once every 7 days. Add fresh water after each fertilization to keep the transparency of the pool water at 20-30 cm. Use 10-15 kg of quicklime per mu of water every half a month
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