Knowing pests knowing drugs
The use of pesticides is one of the quickest and easiest ways to operate pesticides in crop pests and weeds. However, to achieve the best results with the least amount of money spent on herbs, it is necessary to grasp the law of occurrence of diseases, weeds and weeds, as well as the nature of the pesticides used, so as to achieve the right medicine.
1. The efficacy is fast and short: The insecticides such as chlorantraniliprole, spirotetramat, and diflubenzuron have a long potency, but these agents are mainly for newly hatched larvae or Eggs, and play a slower effect. Need to use drugs in a timely manner in advance, if the majority of pests into the mature stage or adult stage and then medication, the efficacy will be poor. Phoxim, dichlorvos, acetamiprid and some pyrethroid insecticides come quickly, but their potency is relatively short. Therefore, the use of these agents and other insecticides should be alternated or mixed to achieve the combination of speed and length. For example, when there is a large amount of whitefly in the greenhouse, spray the quick-responsive acetamiprid to compound bifenthrin to reduce the population density and then spray the spirotetramat immediately to control the pests.
2. There is a difference between preventive protection and systemic treatment: Bactericides such as sulfur, thiram, dexamethasone, and copper preparations cannot be absorbed by the plant body, but they can be effectively killed if they are evenly sprayed on the surface of the crop. Kills infected bacteria and protects crops from harassment by germs. It is necessary to pay attention to the use of such fungicides in advance of the arrival of germs and invading plants, or in conjunction with the use of systemic fungicides. Otherwise, they will only serve as a supplement. For example, when the cucumber downy mildew can be sprayed prior to the occurrence of copper preparations, chlorothalonil and other preventive protection, when it is a serious occurrence of the disease, it is best to use a more effective treatment of fungicides such as dimethomorph, flumorph, etc. After the germs were sprayed, pyrazolubifen or azoxystrobin, which had good permeability, was sprayed with copper machine preparation to protect the cucumber leaves. After 5 days, normal spray protection was sufficient.
3. The direction of internal absorption and conduction is not the same: it is also a systemic drug, but spirotetramat, metalaxyl, picoxystrobin and fluoxastrobin can be conducted in both directions, but thiamethoxam, imidacloprid, and phenyl ether Meconazole and propamocarb can only be transmitted upward. Taking advantage of these characteristics, propofol hydrochloride spray irrigation has better efficacy than foliar spraying. Spraying seedlings or roots with thiamethoxam liquid prior to colonization can prevent whitefly aphids Pests. When foliar spraying of difenoconazole is used to control early blight of tomato or anthracnose, the sprayer is preferably directed at the middle and lower leaves of the plant, and the liquid falling on the top leaf is rarely transmitted to the lower leaf of the susceptible leaf.
4. Targets for prevention and control: Chlorantraniliprole is very effective against Lepidoptera pests such as Pieris rapae, Cotton bollworm, Spodoptera exigua, etc. However, it is almost ineffective against aphids such as whitefly. Pyromone, imidacloprid and thiamethoxam are the opposites. Metalaxyl, propamocarb, dimethomorph, fluoromorpholine, etc. have good effects on diseases caused by diseases such as epidemic diseases, downy mildew, and other low-level fungi, but they are effective against the diseases caused by high-level fungi such as brown spot caused by anthracnose and early blight. The effect is very poor. Correspondingly, difenoconazole, flusilazole, tebuconazole, carbendazim, etc. have poor effects on downy mildew disease, and have good efficacy against early blight such as anthrax.
As the saying goes, prevention and treatment of insect pests require symptomatic remedy. The disease here refers to both the occurrence and occurrence of diseases and insect pests and the pharmacy's own characteristics. Knowing the characteristics of pesticides while using pests and diseases, it will be simple and effective in controlling pests and diseases.
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