Cotton wool

Scientific name Aphis atrata Zhang Homoptera, Polygonaceae. Alias ​​Purple Mission. Distribution of Xinjiang, Ningxia and Gansu.

Host cotton, bitter beans, wolfberry and so on.

The characteristics of damage on the cotton seedlings clustered on the tender head, cotyledons, and the opposite of the true leaf, sucked juice, the young leaves were crooked and shriveled, the growing point was withered and fell off, and the branches and axils were clustered to form thick and short, multi-weighted deformed cotton plants with growth stagnation. More than 15 days.

Scientific name Aphis atrata Zhang Homoptera, Polygonaceae. Alias ​​Purple Mission. Distribution of Xinjiang, Ningxia and Gansu.

Host cotton, bitter beans, wolfberry and so on.

The characteristics of damage on the cotton seedlings clustered on the tender head, cotyledons, and the opposite of the true leaf, sucked juice, the young leaves were crooked and shriveled, the growing point was withered and fell off, and the branches and axils were clustered to form thick and short, multi-weighted deformed cotton plants with growth stagnation. More than 15 days.

Life habits are unknown in the annual algebra, with the fertilized eggs overwintering in the 4–5 cm soil surface of bitter beans or pod stems and rhizomes. When the temperature in Hunchun rises above 10°C, the overwintering eggs are hatched as dry mothers, all parthenogenetically, continue to live on the root rhizomes of the soil, and can grow to give birth to parthenogenetic eggs. The offspring is still a parthenogenetic quail, and the reproduction is repeated. After 3 generations, winged migratory locusts occur from late April to early May. They move to newly emerged cotton seedlings. Several female ovipares live for several generations, resulting in winged koalas and flying to other cotton plants. 5 The end of the month - the beginning of June into the heyday. The number of people entering the hot season decreased, and some of them leaped over the summer. In the late autumn, females and males were found on the pupa and wintered after mating. The temperature of 16-23°C is suitable for it. Below 16°C, it is unfavorable for the winged beak to take off, and the breeding above 25°C is inhibited. There are natural enemies such as cocoon, cockroach bee, ladybug, grasshopper, hoverfly, spider and so on.

Prevention and control methods (1) Picking treatment when spotting occurs in cotton fields. (2) Apply to the soil with organophosphorus or carbofuran and other systemic sucking granules. (3) For other methods, see cotton aphid.