What are the commonly used pesticides? Deltamethrin, methyl parathion

(1) parathion

Also known as 1605, is a widely effective and highly toxic insecticide. It has strong contact, stomach poison and fumigation effect, and the egg killing effect is better, but there is no internal suction and transport effect.

Parathion is a brownish-yellow oily liquid and is unstable to ultraviolet light and air. It decomposes relatively quickly in vivo and in vitro, due to the action of sunlight and enzymes. The residual time on inanimate objects is longer, and the residual period on leaves is 4Murray 5 days. It also has strong lethality to bees and natural enemies. The commonly used concentration is 50% EC 1000-1500 times. Generally, the effect of controlling jujube step and jujube armyworm is very good.

(2) Methyl parathion

Also known as methyl 1605. Brown oily liquid, insoluble in water, soluble in ethanol and acetone. It is stable in neutral and acidic media and decomposes rapidly in case of alkaline. It has contact killing and stomach toxicity, and has a certain steaming and fumigating effect.

The residual period of methyl parathion on green leaves is 12ml / kg for 36 hours and on inanimate bodies for several days. The main control objects are jujube armyworm, jujube geometrid and so on.

(3) phoxim

Light yellow oily liquid, stable in medium and acid medium, easy to decompose in case of alkali. It degrades faster in the sun. The degradation is slow under dark conditions. The residual period was 2m / m / m for 3 days.

Phoxim has strong contact toxicity and stomach toxicity, but has no internal absorption. It has contact and fumigation effect on bees. It is a pesticide with high efficiency, low toxicity and low residue. It has the best killing effect on jujube armyworm, Lepidoptera, tortoise wax scale, fruit fly and warehouse pests. The commonly used concentration is 50% phoxim 1000 murmur1500 times.

(4) Malathion

The pure compound is a colorless liquid, stable in neutral medium, decomposed quickly in case of copper and aluminum, soluble in organic solution with dose, and slightly soluble in water.

The drug mainly has contact and stomach toxicity and can be oxidized to malathion oxide which is more virulent in pests, thus it can exert stronger insecticidal properties. The main control targets are heart-eating insects, leaf-eating insects, scaly-winged eyewitness pests. Use 1000-1500 times the concentration of malathion EC.

(5) dimethoate

It is an organophosphorus insecticide with high efficiency and low toxicity. It is a commonly used internal inhalation insecticide. When the medicine is absorbed by the plant, with the flow of water in the tree, it is transported to the root, stem, leaf, flower, fruit and other organs, but does not affect the normal physiological function of the plant. When the pest gnaws on the plant organ, it is killed and poisoned by the liquid.

Dimethoate not only has a strong insecticidal effect, but also has good contact and stomach toxicity. It is a broad-spectrum, high-efficiency and low-toxic insecticide commonly used by fruit farmers. However, on jujube trees, dimethoate is very sensitive to jujube leaves and is prone to drug damage, so dimethoate is generally used instead of dimethoate on jujube trees.

The control targets of omethoate are leaf rollers and mites, and the commonly used concentration is 20000 times of omethoate. In order to control the resistance of insect pests, it should be used alternately with other pesticides.

(6) carbaryl

Also known as aminomethyl. The drug is non-irritating, odorless, does not pollute the environment, is stable and has long residual effect.

Carbaryl has contact toxicity, stomach poison and weak internal absorption, can control more than 150 kinds of pests, can be mixed with a variety of pesticides. It should not be mixed with alkaline drugs. The usual concentration is 50% carbaryl 400 times solution. The object of control is scale insects.

(7) Deltamethrin

It is a highly effective insecticide imitating pyrethrin in Compositae plants. It has the characteristics of fast knockout of insects, low toxicity and low residue.

The drug is easy to decompose and fail in alkaline solution, stable in acid and neutral medium, and easily soluble in acetone, ethanol, benzene and so on. The drug has a wide range of control objects, small dosage and rapid insecticidal. It is mostly used in Lepidoptera, Hemiptera, Homoptera and Hymenoptera, but it has poor control effect on mites cotton boll weevil. It is generally used in Zaozhuang trees with excellent efficacy, and the dosage concentration is 60000 times for the control of Zaobuqu, 5000 times for peach heart borer and 4000 times for tortoise wax scale. However, the long-term use of pyrethroids insecticides not only has a poor insecticidal effect on mites, but also kills the natural enemies of mites, which is easy to cause the occurrence of mites and cause serious harm to jujube producing areas.