Plant Protection Station of Sichuan Province predicts 11 million mu of pests and diseases of corn this year. Major pests and diseases: The corn borers may have moderate to heavy weight in the whole province. According to the cultivation system, meteorological conditions, and the base number of winter locusts, local occurrence may occur. The occurrence area is about 5.5 million mu; the occurrence of maize sheath blight is moderate and is expected to occur. The area is about 3.5 million mu. The occurrence of large and small spot disease occurs moderately, with an area of ​​2 million mu. For the prevention and control of corn diseases, weeds and weeds, the principle of "prevention first, comprehensive prevention and treatment" should be implemented. We must rationally apply various prevention and control measures and must not abuse chemical agents. Especially for fresh corn, we should avoid the use of highly toxic pesticides and use biological control as much as possible. Drilling resistance and leaf pest control are now less resistant to high-risk species. Prevention and control of this insect should focus on catching wintering (for corn borers are mostly mature larvae in host plants such as corn overwintering) and heart and leaf phase control two The main link, if necessary, is to prevent and control at the heading stage. The so-called overwintering prevention and control is to treat the overwintering host stalks before the emergence of adult eclosion in the spring and reduce the overwintering base number. 3% carbofuran granules in the leaf stage (trumk period) (Describe one point, the original drug is highly toxic, this preparation is toxic. This preparation is not recommended for use on fresh corn), insecticidal double granules, sharp Special sand dessert. In addition, in the adult stage, blacklights or sex attractants are used to trap and kill a large number of adult insects and reduce the risk of the next generation of insects. For fresh corn, it is best to use BT, Beauveria bassiana, Trichogramma and other biological agents to control (Oryx period of oviposition, artificial release of Trichogramma; egg incubation stage, spraying BT wettable powder; leaf stage, using white Metastatic powder with fine soil and adobe soil cake). The prevention and treatment of big warts can refer to the prevention and control methods of corn bran. The prevention and control of cotton bollworm and other leaf-feeding pests can be prevented and controlled by farmland music and pyrethroid pesticide spraying when the prevention and control indexes are met. The sucking and sucking pests control the corn borer by sucking the sap of the corn plant and affecting the growth of the corn. Can be used 20% of a good winter EC, imidacloprid, Kang Wei and other agents spray control. The leafhoppers, thrips, whitefly, and alfalfa can be controlled by this method. The red spider that harms corn can be controlled by acaricides such as chlorantranyl bromide and broomfly. Liriomyza sativae can not be controlled when the damage is light, and it can be controlled by avermectin and its compound preparations, farmland and other drugs if the pest is severe. In the greenhouse, yellow-stained plates can be used to seduce the piercing and sucking pests. Underground pests control underground pests including tigers, earthworms, cockroaches, and helminths. They can be controlled by phoxim seed dressing when maize is sown. They are used for farmland seedlings, enemy kills, Anlubao, and Green Pepsi. And other agents to prevent and control. For the disease prevention of corn, the disease resistant varieties can be selected and the fungicides such as chlorothalonil and carbendazim can be sprayed in the early stage of disease prevention and treatment. For virus diseases, it mainly strengthens the control of insecticides such as aphids and thrips, and can be used with virus A and plant diseases. For rust, triadimefon can be used for prevention and treatment. For head smut, tumor smut, in the selection of resistant varieties at the same time, available Rickett, Wei Fu and other agents seed dressing. For mad-top disease, metalaxyl, anti-virus and other anti-virus drugs can be used for seed dressing. Rhizoctonia, can be used Jinggangmycin, carbendazim, thiophanate-methyl in the middle of corn growth spraying on the lower part of the stem. Pre-emergence herbicides for weed control before or after sowing include atrazine, acetochlor, metolachlor, isoprofloxacin, pendimethalin, and kudzuqing (before sowing, after sowing, and seedlings It can be used afterwards, but the lower crop cannot grow rape, sugar beet, and cotton. Post-emergence herbicides have made it long, herbicidal, bentazone, bromoxynil, and nicotinamide. In addition, after corn jointing, weeds were used to directional weeding. For the monocropping maize field, the situation is very complicated if the corn covers other crops. Generally, acetochlor, metolachlor, isoproterenol and pendimethalin can be used before seedlings.
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