Cocoon moth is commonly known as box moth, diamondback moth, small green caterpillar, hanged ghost, and two tips. Lepidoptera, Plutellae.

(1) Harmfulness Plutella xylostella is a worldwide pest, which is distributed throughout the country. The damage in the south is more serious and it is one of the important pests of vegetables. Plutella xylostella mainly harms more than 40 species of cruciferous vegetables and other cruciferous hosts. It harms cabbage, radish, broccoli, cabbage, mustard, turnip, and rapeseed in our country. In addition, it can harm tomatoes, potatoes, ginger, onions, etc.

The leaves of the first instar larvae of Plutella xylostella are harmful, and the leaves and meat are drilled to leave two upper and lower epidermis layers. Or feed on petiole and veins. After 2 years of age, they are fed on the leaves, leaving only a layer of epidermis, commonly known as open skylight. Larger larvae bite the leaves into small holes. The larvae harm the young leaves of the seedlings and affect the development of the vegetables. In the case of hazards on the retained strains, young leaves, tender stems, tender pods, and tender seeds can be taken, affecting seed yield.

(2) Control methods

1 The rational layout of Cai Tianzhong should avoid the annual succession of cruciferous vegetables. The early, middle and late varieties are planted with other vegetables or separated by a certain distance. Prevent pests from causing serious harm in succession.

2 Clean the garden After the harvest, remove the fallen leaves in time and bring them out of the field to be buried or burned. Eliminate larvae or cockroaches and reduce the population density in the field.

(3) Lights and sex attractants are used to trap adult insects. Black light can be trapped and killed in fields. Also available for trapping by moth trapping: The female moth that emerged on the day was used to take the end of the abdomen and crudely extracted with a solvent such as methylene chloride and alcohol. The crude extract was applied to a strip of paper and hung in the field to attract male moths for trapping. .

4 Chemical control spraying in young age, the commonly used agent is Bacillus thuringiensis 500-1000 times solution, or BT emulsion, 100 grams per acre, or diflubenzuron No. 1, No. 3 500-1000 times solution, or 40 5% chrysanthemum emulsion 2000-3000 times, or 40% chrysanthemum 2000-3000 times, or 10% cypermethrin 2000-3000 times, or 20% cypermethrin 2000-3000 times, or 5% Mengmeng 3000 times liquid, or use Jinan -79 strain (Phyllium prion granules virus agent) 5000 times, or 50% Bataan WP 1000-1500 times, or 10.8% Caesar EC 10000-20000 times liquid.

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