Analysis of the eight common reasons for reduced pesticide efficacy

Common reasons for reduced pesticide efficacy

1. Pesticide efficacy is closely related to meteorological factors such as temperature, humidity, rain, dew, wind and light. When using stomach-poison and contact-poison pesticides, at least two days without rain washing is needed to give better play to the efficacy.

2. Choosing the wrong pesticide for the problem.

3. When controlling insect pests, applying the pesticide at the peak of adult egg-laying or from the initial hatching of larvae to before the third instar gives the best effect.

4. Improper control of the dosage. Too much or too little pesticide is bad: too high a concentration easily causes pesticide damage, while too low a concentration fails to achieve the control purpose. It must be prepared according to the pesticide instructions and requirements combined with the actual situation to obtain satisfactory results.

5. Improper mixing of pesticides. Pesticides are divided into acidic and alkaline types; improper mixing easily causes acid-base neutralization and decomposition, leading to loss of efficacy.

6. Spraying must reach the key parts to achieve the desired effect. For example, when controlling cotton red spider mite, the pesticide must be sprayed on the underside of the leaves to achieve the best effect.

7. Misdiagnosis of the condition. For example, taking early defoliation disease of fruit trees as spider damage, or taking tomato bacterial wilt as root death of seedlings caused by underground pests, and so on.

8. Poor efficacy is also related to the spraying tool used. A high-quality sprayer saves both pesticide and labor and can also improve efficacy. Inferior spraying tools cause pesticide damage, produce losses, and even cause poisoning among farmers.