How to prevent and cure the gray snail?

The gray snail is a mollusk of the snail family, which is widely distributed all over China. It is mainly parasitic on jute, kenaf, Ramie, cotton, beans, corn, barley, wheat, vegetables, melons and so on. When it is serious, it bites off the hemp seedlings and causes the lack of seedlings and broken ridges. Let's take a look at how to prevent and control the snails.

Morphological characteristics

The gray snail is the same size as the field snail, and its shell is slightly thicker, sturdy and spherical. The shell is 19 mm high and 21 mm wide, and has 5.5 to 6 snail layers. The top several snail layers grow slowly and slightly, while the body snail layer grows rapidly and expands. The shell is yellowish brown or amber and has fine and dense growth lines and threads. The shell is at the top. The suture is deep. The shell mouth is oval, the mouth edge is complete, slightly folded, sharp, fragile. The axle edge is folded out at the umbilical hole to cover the umbilical hole slightly. The umbilical foramen is narrow and crevice-like. The individual size and color vary greatly. Ovoid, white.

Occurrence regularity

The first generation is born in Shanghai and Zhejiang. In late November, adult shellfish and young shellfish overwintered under the soil cracks on the ridge of the field, fallen leaves of residual plants, and objects in front and behind the house. The snail began to be active in the first and middle of March the following year. The snail lurks during the day, feeds in the evening or early morning, and perches on the plant all day in case of overcast and rainy days. The adult shellfish began to mate from late April to the first half of May, and soon laid the eggs in the wet soil on the rhizome of the plant. the first egg surface was covered with mucus, and after drying, the eggs were glued together to form a lump, and the newly hatched shellfish clustered together to feed. When they grow up, they disperse the damage and like to live in the dense and low-lying damp places of the plants. Warm and rainy weather and wet land in the field suffer heavily. In case of high temperature and dry conditions, the shell mouth is often sealed, lurking in wet soil crevices or under stems and leaves. When the conditions are suitable, such as rain or irrigation, go out to eat in the evening or in the morning. The winter begins again in mid-to-late November.

Prevention and cure method

1. Capture manually in the early morning or rainy days and concentrate on killing.

2. Sprinkle with 3kg tea cake powder or add 100kg water with 1kg 1.5kg tea cake powder. After soaking for 24 hours, take the filtrate to spray, or spray it with 1000 times phoxim EC.

3. 1.5 kg / mu of Mianxuling granule was used, crushed and mixed with fine soil or cake crumbs of 5kg / mu. In the warm and dry evening, the snails exposed to the fungicide secreted a large amount of mucus and died. The snails exposed to the chemical secreted a large amount of mucus and died 2-3 days later. The appropriate time for prevention and control is before snails lay eggs, and the effect is better when there are small snails in the field.