In the vegetable production, the occurrence of diseases and pests is unavoidable due to crop characteristics, growth and development environment. In the pollution-free vegetable production process, pesticides for controlling pests and diseases are updated and have higher requirements. Generally, pesticides suitable for pollution-free production are generally required to have The following features: First, it has high efficiency and quick effect, otherwise it does not have practicality in the production of
Vegetables; at the same time, it has strict requirements on the persistence of pesticides, otherwise it will lead to unsafe food. Second, it has low toxicity, low residue, and continuous safety. It requires that the main ingredients of the drug (including the ingredients of each dosage form) be rapidly eliminated in nature (such as efficient photolysis, hydrolysis, or decomposition by microorganisms) and does not constitute pollution to the environment. It does not constitute damage to natural enemies, pollinators, etc., and it is not easy to cause phytotoxicity to the vegetable crop itself. The third is broad-spectrum, not only effective against many types of pests, but also effective against various insect species, such as larvae, adults, cockroaches, and eggs of the same pest. Fourthly, it is highly selective to certain vegetable pests. For example, pesticides such as anti-indolazole can have extremely targeted killing of certain harmful insects or fungi, viruses, and germs. Fifth, it is not easy to produce, at least not quickly produce drug resistance or cross-resistance, and can maintain the effect of pesticides on pests and diseases for a long time. Sixth, pesticides have a novel structural formula and unique mechanism of action, which can effectively curb the reproduction and spread of insecticide-resistant and microorganism-producing pests. To meet the pesticide requirements for the above-mentioned pollution-free vegetable production, it is generally considered that there are several types of pesticides that are more suitable: First, biological pesticides such as bacterial pesticides (BT agents), fungal insecticides (Brazilus, waxweed) Bacteria, etc.), insect disease insecticides, and insect pheromones (such as sex attractants, etc.); second, plant-derived pesticides: such as plants that can produce specific effects such as feeding, repelling, hindering growth, and disturbing reproduction. Extracts (such as Chuanxiong, etc.). The third is insect growth regulators: through controlling their development, hindering their molting and blocking reproduction, they play a controlling role. They are generally highly targeted, have little impact on natural enemies, and are non-toxic to humans and animals, such as bufalin and cyromazine. The fourth is efficient, quick-acting, low-residue pesticides, such as pyrethroids; five are new antibiotics; such as polymyxin, etc., for human and animal safety, safety interval is short; six is ​​a highly effective strong selection agent: to kill pests Such as specificity is strong, only for certain pests and insect pests such as anti-inhibitory, etc.; 7 is a unique mechanism of action of new pesticides, such as the chloropyridine insecticide imidacloprid, sulfur-containing heterocyclic thiazole nicotinic insecticides Akte et al. belong to this category. No matter what kind of pesticides are used in the production of pollution-free vegetables, special attention should be paid to the safety interval of pesticide application. Otherwise, on the one hand, the phytotoxicity of crops will be caused, and on the other hand, the accumulation of pesticide residues will increase. The following basic requirements for the interval between several major pesticide types of pests and diseases are as follows: Bactericide: 58% of thiram Mn-Zn wettable powder for 2-3 days; 64% anti-virus WP, 77% WP , 50% nareli wettable powder 3-5 days; 50% acetaminophen WP, 75% chlorothalonil WP, 70% thiophanate-methyl wettable powder at intervals of about 7 days is good. Insecticides: 10% cypermethrin EC, 2.5% betamethrin, 5% lefluulin EC, 10% fast enemy emulsion oil, 20% Schleswig EC, 20% fenpropathrin EC, etc. 3 days or so; 2.5% Kung Fu EC, 1.8% AI Fu EC, 40.7% LS, 35% UB, 10% MARP, 50% WP WP for 7 days; 5% anti-Hu Wei WP, 20% fenvalerate EC, 5% Doble WP, etc., at intervals of 5-6 days; 20% quizphorus EC at intervals of not less than 9 days. Acaricide: 50% Torc WP for about 7 days; 50% Bromoxime EC should be separated by about 14 days.
Fresh Green Broccoli
Fresh Green Broccoli,Fresh Cauliflower,Fresh Broccoli Wholesale
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