The scale insects that threaten the pears, such as Pear clams, Japanese wax clams, and K. grandis, have hard shells or wax powder, and the pesticides are difficult to penetrate and adhere to. The control is very difficult and should be based on the law of its occurrence. , timely and sophisticated management. 1, do a good job of artificial control. In conjunction with winter pruning, cut out severed branches of the beetles, burn them together or brush off the scale insects on the branches with a hard brush. 2, pay attention to biological control. The protection and utilization of natural enemies such as ladybugs and parasites can effectively inhibit the occurrence of large areas of scale insects, but care should be taken to avoid the widespread use of broad-spectrum insecticides during the occurrence of natural enemies. 3, overwintering insects sprayed during the flood control period. Flower bud germination period is the best time to control scale insects. At this time, fruit trees have not sprouted and blossomed. The scope of
Pesticide selection is large. When the scale insects are damaged, they can be controlled by penetrating the 800 times rapid penetration liquid and can receive. Very good control effect. 4, nymphs incubation period of drug control. At this point, it is the best time for the drug to control the scale insects. The liquid medicine can enter the shell to kill the insect body inside the shell, and can also reach the crawling larvae and kill it. When the young larvae were found to hatch, they were immediately treated with medication. Commonly used agents are 20% speed killing 1500-2000 times, 2.5% deltamethrin 1500-2000 times, 80% dichlorvos 1000-1500 times, and 10% cypermethrin 1500-2000 times.
Watermelon
Watermelon (scientific name: Citrullus lanatus (Thunb.) Matsum. Et Nakai) annual sprawling vines;Stems and branches stout, with distinct edges.Tendril is thick, pubescent, petioles thick, densely villous;Leaf blade papery, contour triangular ovate, with white and green, two masks short bristles, leaf base of heart.Monoecious.The female and male flowers solitary in axil.Male flowers pedicel 3-4 cm long, densely yellow-brown pilose on long;Calyx tube KuanZhong shape;Corolla pale yellow;Stamens nearly distinct, filaments short, medicine chamber flex.Female flowers: calyx and corolla with male flowers;Ovary ovoid, stigma kidney.Fruit large, nearly spherical or oval, succulent, juicy, the skin is smooth, all kinds of color and decorative pattern.Most seeds, ovoid, black, red, two sides smooth, base obtuse, margin slightly arched, usually and summer.
Across China, many varieties, pericarp, pulp, and seeds in a variety of forms, in xinjiang, lanzhou, gansu province, shandong Texas, dongtai, jiangsu province, one of the most famous.The species may come from Africa, already widely cultivated in tropical to temperate zone, jin, yuan was introduced into China in the beginning.
The summer fruit is watermelon, sweet fruit meat, cooling QuShu;Seed oil, but for recreation food;The skin of medicinal, have clear heat, diuresis, fall blood pressure effect.
Watermelon Seeds
Watermelon Seeds,Red Watermelon Seeds,Dried Watermelon Seeds,Black Watermelon Seeds
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