The control effect is the result of a comprehensive effect of a pesticide on a certain control object under certain environmental conditions. The following three factors affect the efficacy of pesticides:
(1) Factors of the pesticide itself: The chemical composition, physicochemical properties, mechanism of action, dose used, and processing traits of the pesticide all directly or indirectly affect the efficacy of the pesticide. For example, fast-killing dips are effective against many lepidopteran pests, but are not effective against alfalfa; the effects of 20 ml and 40 ml per acre to control lepidopteran pests will be quite different. According to the control object, crop type and use period, select the appropriate pesticide species, dosage forms and dosage.
(2) Factors for prevention and control: There are differences in the living habits of different pests and diseases. Even if they are the same disease or pest, the response to different pesticides or similar pesticides is not the same due to the different stages of development. difference. For example, Ganoderma lucidum is effective against most grassy weeds and is ineffective against broad-leaved weeds; monocrotophos has good effects on 1st and 2nd instar larvae of cotton bollworm, but has poor effects on larvae after 3rd instar.
(3) Environmental factors: Environmental factors such as temperature, humidity, rain, light, wind, and soil properties directly affect the physiological activities of pests and diseases and the performance of pesticides. The results will affect the efficacy of pesticides. For example, the herbicides acetochlor, trifluralin, lansoline, and dole have the same application rates, and the herbicidal effect is poor in drought conditions. Under suitable soil moisture conditions, the herbicidal effect is high; when used on sandy soil, the effect is significantly higher than that of It is used in areas with high organic content. Phoxim sees light decomposition failure. Therefore, before using pesticides, we must master its performance characteristics, biological characteristics of the control object; in the application process, make full use of all the favorable factors, control of unfavorable factors, in order to achieve the best control effect.
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