Impatiens brown cloud agate snail

Impatiens brown cloud agate snail scientific name AchattnafulicaFerussac, synonym A.couroupaLesson, A.fulicaTIyon, stalk eye, agate snail family, alias African snail. Originated in coastal areas of East Africa, it was introduced into Guangdong, Guangxi, Yunnan, Fujian, Hainan, Taiwan and other places in China in the 1930s. The hosts are impatiens and other flowers, vegetables and fruit trees.

The damage is characterized by omnivorous pests, and most of the young snails are saprophytic, which harms the leaves of the host, and in serious cases, the tender stems and buds are truncated, resulting in lack of seedlings, ridges or plant death.

Morphological characteristics

The body is oval or oval, the shell is right-handed, with a slightly thicker calcareous shell, 130mm in height and 54mm in width. It is the largest snail in China, with 8 snail layers of 6.6ml. The growth of each snail layer is slow, the spiral part is conical, the snail layer is enlarged, its height is about 3x4 of the shell height, and the shell tip has a deep suture line. The shell is yellow, with scorched brown foggy pattern, the germ shell is jade white, the rest of the snail layer has intermittent brown stripes, the growth line is thick and obvious, the thread on the shell is blue-white or light purple, the thread on the snail layer is not obvious, and the thread of each screw layer in the middle is staggered with the growth line; the shell mouth is oval, the mouth margin is complete and simple, the outer lip is thin and sharp, fragile; the inner lip is attached to the body snail layer to form an "S"-shaped blue-white callus; the shaft edge is folded out. There is no navel hole, the foot is muscular, the back is dark brown and black, the mucus is colorless. Oval, white.

The occurrence pattern in the south is generally in early March, unearthed activities, like a warm environment, but can survive in low temperatures or unfavorable conditions through dormancy. The life span is 5-6 years, and the long one can be as long as 9 years. Ching Ming Festival moved frequently until early October. When the external environment is cold or dry, it secretes a milky opaque mucus film of the same size as the shell mouth, which is used to seal the shell mouth. Lay eggs in shallow soil. It has phototaxis, crawls out at night, feeds, and likes to live in weeds, trees, dark, moist environment or humus-rich, loose soil or hide dormant on the back of leaves during the day. After rain, the weather is sunny and you can exercise all day long, and the temperature is 17 ℃ and 24 min suitable for your life. Hermaphrodites. After 30 days of incubation. When you encounter unfavorable living conditions, you will soon enter a dormant state and can survive dormant for several years. It can be buried at a depth of 150 mm in dry weather and 150 mm in hibernation.

Prevention and cure method

(1) carry out strict quarantine, transfer vegetable seedlings, flowers, seedlings and other plants as well as packing boxes from the epidemic area to the north should be carefully quarantined, and should be sterilized once found.

(2) according to its phototaxis, black light can be used to trap and kill.

(3) 1 part of calcium arsenate and 1 part of lime powder in young snail stage.