Biological insecticide for Chinese cabbage and preparation method thereof

Abstract

The invention discloses a biological insecticide for Chinese cabbage and a preparation method thereof. The biological insecticide for Chinese cabbage is composed of the following components with contents in percentage by weight: 5-12% of fresh ginger extract, 8-15% of garlic extract, 5-10% of sealwort extract, 4-12% of ailanthus peel extract, 7-12% of semen armeniacae amarae extract, 10-18% of saponin extract, 8-16% of white pepper extract, 4-10% of azadirachtin extract and 7-20% of berberis thunbergii extract.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to a preparation method of a biopesticide for Chinese cabbage. Background technique [0002] Chinese cabbage pests mainly include aphids, whiteflies, cabbage caterpillars, beet armyworms, and diamondback moths. The damage characteristics of aphids and whitefly: Both adults and nymphs suck the juice of Chinese cabbage, resulting in chlorosis, yellowing, wilting of the damaged leaves, and even the death of the whole plant; the secreted honeydew seriously pollutes the leaves, causing mildew. Make cabbage lose its edible value; in addition, it can also spread viral diseases. The damage characteristics of cabbage caterpillar, beet armyworm and diamondback moth: all three kinds of pests eat leaves with larvae. After the 3rd instar cabbage caterpillar can eat the whole leaf, and only the leaf veins are the most serious damage, which seriously affects the growth and core of cabbage, res...

AI Technical Summary

Problems solved by technology

The damage characteristics of aphids and whitefly: Both adults and nymphs suck the juice of Chinese cabbage, resulting in chlorosis, yellowing, wilting of the damaged leaves, and even the death of the whole plant; the secreted honeydew seriously pollutes the leaves, causing mildew. Make cabbage lose its edible value; in addition, it can also spread viral diseases

The damage characteristics of cabbage caterpillar, beet armyworm and diamondback moth: all three kinds of pests eat leaves with larvae. After the 3rd instar cabbage caterpillar can eat the whole leaf, and only the leaf veins are the most serious damage, which seriously affects the growth and core of cabbage, resulting in reduced yield ;The beet armyworm mainly gathers the back of the leaves with newly hatched larvae and spins silk to form a net, and eats the mesophyll in it, leaving the epidermis to form small transparent holes. After the 4th age, the food intake increases greatly, and the leaves are eaten into holes or notches. Only the veins and petioles are left, which has a great impact on the yield and quality; the diamondback moth can eat the leaves into holes and nicks, and in severe cases, the whole leaf will be eaten into a net, and often gather at the center leaf to damage the cabbage core at the seedling stage.

At present, there are three main methods for the prevention and control of cabbage pests: physical methods, biological methods, and chemical methods. Among them, the physical method is pollution-free, but it consumes manpower and material resources, and the time is too long, so it is not advisable. The chemical method is efficient, but the pesticide residue is serious and harmful to the human body. , so the most desirable method is biological control. In the initial stage of insect pest release, spraying with biological agents is both efficient and low-toxic. It is the best pesticide choice for the production of pollution-free green vegetables.

At present, the use of biological agents for cabbage is relatively common, but there is no special agent for common cabbage pests