There's more to choosing an insecticide than meets the eye: remember these four things to look for
(1) Derris extract is a botanical insecticide extracted from the roots of derris, with contact and stomach poison action, and is quite effective against aphids and lepidopteran larvae. It is extremely safe for humans, livestock and crops, and is especially suitable for use on fruit, vegetables, tea and mulberry; the usual spray is a 500-800 times dilution of 2.5% derris extract emulsifiable concentrate. (2) Bacillus thuringiensis belongs to Bacu...
First, look at the wetting and spreading performance of the pesticide film. Wettability refers to whether the pesticide solution, after being sprayed onto the crop surface or onto the pest's body, can wet and fully spread out. Take a small amount of the pesticide, mix it well, and apply it to crop leaves and twigs as a test. If it can form a pesticide film with little solution runoff, it has good wetting and spreading performance; otherwise, it is poor. When using insecticides with poor wettability (such as botanical pesticide aqueous solutions), a small amount of neutral laundry detergent can be added to the solution to enhance the wetting and spreading performance.Second, look at the pesticide's adhesion effect. High-quality pesticides generally have good adhesion, but insecticidal emulsifiable concentrates with poor emulsifying performance and dusts have relatively poor adhesion. Therefore, to improve the adhesion of the solution, it is best to apply dust insecticides in the morning when there is dew on the plant surface; when using insecticides with poor emulsifying performance, a small amount of neutral laundry detergent can be added during preparation to improve the contact-killing effect on pests.
Third, look at the pesticide's stability and efficacy. The stability of a pesticide is crucial to the effectiveness of an insecticide. Insecticides with poor stability tend to undergo natural decomposition, deterioration and similar problems during storage. Therefore, when farmers choose insecticides, they must pay attention to the pesticide's stability and efficacy. Never buy insecticides with poor stability and efficacy casually, so as not to affect the insecticidal effect.
Fourth, look at whether the pesticide's suspension rate is high or low. Suspensibility refers to the properties of formulations such as wettable powders and suspension concentrates. An insecticide with good suspensibility has small particles that can evenly disperse and suspend in water without sinking, which helps improve efficacy; for a pesticide with poor suspensibility, after dilution with water, if you shake it gently, the powder particles will disperse and suspend, but once it is left still, the powder particles will sink to the bottom of the water, reducing efficacy. When purchasing, be sure to focus on choosing a pesticide with good suspensibility. For insecticides with poor suspensibility, a small amount of neutral laundry detergent can be added when mixing and using them to improve their suspensibility.