Pyrethroids are harmful to people, but the harm is relatively small because of its small dosage and low concentration. Pyrethroids have strong contact killing effect, and some varieties have stomach toxicity or fumigation effect, which has good control effect on most pests in agriculture, forestry, horticulture, warehouse, animal husbandry and health. Note that most pyrethroids cannot be mixed with alkaline substances, and are easily decomposed under alkaline conditions, which reduces the efficacy.

1. Are pyrethroids harmful to people?

1, pyrethroids are harmful to people, but less harmful, because the dosage and concentration of pyrethroids are low, so it is safer for people and animals and less polluting to the environment.

2. Pyrethroid is a broad-spectrum insecticide, which can control many kinds of pests. Their toxicity to insects is 1-2 orders of magnitude higher than that of other commonly used pesticides, and they are good in sex and have the characteristics of rapid repelling and knocking down. It has good control effect on most pests in agriculture, forestry, horticulture, storage, animal husbandry, health and other fields, but it has poor control effect on mites.

3. Pyrethroids have strong contact killing effect on insects, and some varieties have both stomach toxicity and fumigation effect, but they have no systemic effect.

4. Most pyrethroids are easy to decompose under alkaline conditions, so be careful not to mix with alkaline substances.

2. What is the action mechanism and insecticidal principle of pyrethroids?

1. Pyrethroid is a physical nerve agent, which can quickly knock down insects. The symptoms of poisoning are excitement, spasm, paralysis and finally death.

2. Pyrethroids mainly destroy the nervous system and act on other tissues and organs, causing a series of tissue diseases and physiological and biochemical changes, leading to insect poisoning and death.

Three, pyrethroid control object

1, fruit tree

Pear powdery mildew, scab, ring rot and rust; Grape powdery mildew, stem blight, anthracnose, black bean disease, gray mold, black spot disease and downy mildew; Citrus scab, anthracnose and dermatosis.

2, leafy vegetables

Powdery mildew and anthracnose of leafy vegetables; Downy mildew and purple spot of onion; Celery leaf spot; White rust of Chinese cabbage.

Step 3: beans

Pea powdery mildew, root rot and Fusarium wilt; Bean rust, leaf spot.