pymetrozine

c belongs to pyridine (pyrimidine) or triazinone insecticides. It is a non insecticidal insecticide. It was first developed by Ciba Jiaji company in 1988. The product has excellent control effect on many kinds of crop piercing mouthparts pests. Pymetrozine has contact killing effect on insect pests, and also has internal absorption activity. It can not only be transported in xylem but also in phloem in plants, so it can be used as both foliar spray and soil treatment. Because of its good transport characteristics, new shoots and leaves can also be effectively protected after spray.

essential information

Another name: pyrazinone

Category: insecticide

English Name: Pymetrozine

Content: 50% WDG

Molecular formula: c10h11n5o

Molecular weight: 217.23

Chemical name: 4,5-dihydro-6-methyl-4 - (3-pyridylmethylamino) - 1,2,4-3 (2H) - one

Toxicity: the oral LD50 of Pymetrozine in rats was 5820 mg / kg, and the dermal LD50 of Pymetrozine in rats was more than 2000 mg / kg.

Physical and chemical properties:

Appearance: white crystalline powder.

Melting point: 217 ℃.

Vapor pressure (20 ℃): < 9.7 × 10-3 PA.

Solubility (20 ℃, g / L): water, 0.27; ethanol, 2.25; n-hexane, < 0.01.

Stability: stable to light and heat, stable under weak acid and weak base conditions.

Specification of technical drug:

Appearance: white or light powder.

Content of active ingredient,%: ≥ 95.0

Acetone insoluble,%: ≤ 1.0

Moisture,%: ≤ 1.0

PH range: 6-9

Preparation (25% Pymetrozine WP)

Appearance: light yellow loose powder, no agglomerate.

Pyrazinone content,%: 25.0

Suspension rate,%: ≥ 75

Wetting time, s: ≤ 90

Fineness (through 44mm aperture sieve),%: ≥ 98

Moisture,%: ≤ 1.5

PH range: 8.0-10.0

Pymetrozine affects virus transmission

In order to minimize the direct damage caused by insect feeding and the spread of plant virus, it is very important to control the sucking insects. In potato, Pymetrozine has high activity against all important aphids. Harrewijin et al. Evaluated the effectiveness of Pymetrozine in reducing the transmission of persistent potato leaf roll virus (PLRV) and non persistent potato virus type Y (PVY). The aphids were transferred to virus-free potato plants sprayed with Pymetrozine after 24 hours of contact with PLRV infected potato plants or 1 hour of contact with PVY infected potato plants. The results showed that Pymetrozine could reduce the transmission of PLRV by 97% and PVY by 75%. Although Pymetrozine did not inhibit the acquisition of PVY, it did reduce the transmission of PVY to subsequent healthy plants by 65%. This indicated that the aphids showed the normal behavior of needle probing at the beginning on the plants treated with Pymetrozine, but when Pymetrozine was effective, it inhibited the aphids from feeding on plant phloem, which resulted in the decrease of PLRV transmission through plant phloem. In another study, starving peach aphids were exposed to non persistent soybean common mosaic virus (BCMV) and transferred to plants sprayed with Pymetrozine. The aphids without Pymetrozine treatment could effectively infect 87.5% of the healthy plants. However, the susceptible rates of the aphids treated with Pymetrozine to the normal plants and the plants sprayed with Pymetrozine were 64.6% and 38.3% respectively. The results showed that Pymetrozine could reduce the transmission of non persistent virus under mild stress.

Principle of action:

The results of electric penetration graph (EPG) showed that whenever aphids or planthoppers were exposed to Pymetrozine, they would stop feeding and starve to death, and this process was irreversible. Therefore, Pymetrozine has excellent function of blocking insect transmission. Although the mechanism of Pymetrozine induced needle occlusion is still unclear, previous studies have shown that this irreversible "cessation" is not caused by "antifeedant effect". The initial mortality of the insects treated with Pymetrozine was very low, and the insects could survive for several days before death, and the mortality was related to the climatic conditions. The results showed that the feeding activity of aphids decreased by about 90% within 3 hours after treatment, and the mortality was close to 100% within 48 hours after treatment.

Product features

Strong selectivity - this product has excellent selectivity, and is almost harmless to some important natural enemies or beneficial insects, such as Coccinella septempunctata, Chrysopidae, leafhopper and spiders of Delphacidae.

The results of leaf experiments showed that the LC50 was 2-3 times higher than that of Pirimicarb and 140 times higher than that of cypermethrin.

It can control resistant strains of pests such as Myzus persicae, which are resistant to organophosphorus and carbamate insecticides.

Application Technology

Drug consumption: control of vegetable aphids and greenhouse whitefly, 5 grams per mu; control wheat aphids, mu 50% grams of WDG5-10 WDG15-20; control rice planthopper, leafhopper, 50% mapicone WDG15-20 grams, control cotton aphids, mu 50% aphid WDG20-30 grams; control peach fruit aphid, apple aphid, can be allocated to 2500-5000 times liquid spray.

The method of pesticide application: 30 kg of water should be added to the dosage of mu, and 10 kg of conventional spray or water should be foggy.

Other related

Scope of application: vegetables, wheat, rice, cotton, fruit trees.

Control scope: Aphididae, Delphacidae, whitefly, Cicadellidae and other pests, such as cabbage aphid, cotton aphid, wheat aphid, peach aphid, leafhopper, brown planthopper, gray planthopper, white backed planthopper, sweet potato whitefly and greenhouse whitefly, etc.

Note: spray should be uniform and thoughtful, especially for target pests.