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.

Structural type

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

Raw material specifications:

Appearance: White or light colored powder.

Active ingredient content,%: ≥ ninety-five

Acetone insoluble substance,%: ≤ one

Moisture content,%: ≤ one

PH range: 6-9

Preparation (25% pymetrozine wettable powder):

Appearance: Light yellow loose powder, no lumps.

Pyrazine ketone content,%: twenty-five

Suspension rate,%: ≥ seventy-five

Wetting time, S：≤90

Fineness (through a 44mm aperture sieve),%: ≥ ninety-eight

Moisture content,%: ≤ one point five

PH range: 8.0-10.0

Working principle

Research using electrical penetration mapping (EPG) technology has shown that, whether in drip, feeding, or injection experiments, aphids or planthoppers almost immediately produce a needle blocking effect upon contact with pymetrozine, stopping feeding immediately and ultimately starving to death, and this process is irreversible. Therefore, pymetrozine has excellent ability to block insect transmission of toxins. Although the mechanism of oral needle obstruction caused by pymetrozine is not yet clear, existing research suggests that this irreversible "cessation of food" is not caused by "refusal to eat". The initial mortality rate of insects treated with pymetrozine is very low, and the insect "hungry moth" can still survive for several days before death, and the mortality rate is related to climatic conditions. Experiments have shown that within 3 hours of treatment with pesticides, the feeding activity of aphids decreases by about 90%. After 48 hours of treatment, the mortality rate can approach 100%.

Product Features

Strong selectivity - This product has excellent selectivity and is almost harmless to certain important natural enemies or beneficial insects, such as the seven spot ladybug of cotton bollworm, common sand flies, leafhoppers, and spiders of planthopper family.

Excellent systemic activity - Foliar experiments have shown that its systemic activity (LC50) is 2-3 times that of imidacloprid and over 140 times that of cypermethrin.

It can prevent and control pests such as peach aphids that are resistant to organophosphate and carbamate insecticides.