Dishes mainly harm cruciferous vegetables such as cabbage, kale, radish, etc. They are often densely packed on the leaves and tender stems, sucking the sap from the plants, causing serious water loss and malnutrition. In addition, many viral diseases are also transmitted. Due to the rapid propagation of the worms, and the fact that many larvae grow on the leaves of the heart and back, they must be sprayed carefully, evenly and thoroughly, and thoroughly penetrated inside and out, and try to use them with touch and suction (stomach). Poisoning) and fumigation and other insecticidal agents, such as 10% imidacloprid or 3% acetamiprid WP 1000 to 1500 times, 50% Pipa mist wettable powder 2000 to 3000 times, 40% dimethoate Or 50% malathion EC 1000 ~ 1500 times liquid and so on.
The cabbage caterpillar is mainly responsible for the cruciferous vegetables, and the young instar larvae feed on the leaf mesophyll and residual epidermis. After 3rd year of age, the leaves were made into holes and nicks. In severe cases, only petioles and veins were left. At the same time, excrement of excrement causes the quality of the vegetables to deteriorate, and causes rot, and the larvae are also easily invaded by soft rot pathogens. It is a critical period for the prevention and control of pesticides that the dietary intake of the cabbage caterpillar is low before 2nd instar, is lightly harmed, and is not resistant to drugs. The commonly used pharmaceuticals include: 300 to 500 times of bacillary insect powder containing 10 billion living spores per gram, 1000 times of Bt emulsion, 800 to 1000 times of 90% crystals of trichlorfon, and 500 to 800 times of 20% of insecticidal fluoxetine. 20% Diflubenzuron No. 1 500 to 1000 times liquid and so on.
Plutella xylostella is commonly known as moth, hanging worms, and small green worms. It mainly affects cabbage, radish, broccoli, cabbage, mustard, turnip, and rapeseed. The first leaf larvae of Plutella xylostella larvae are harmed, and the leaves and meat are drilled to leave two upper and lower epidermis layers, or to feed on the 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 particularly like to eat young leaves, so the most serious damage to the heart of the cabbage, when serious, it is difficult to worry about, and sometimes malformed growth. Plutella xylostella is very resistant to old larvae. Therefore, chemical control should pay attention to: first, control the use of drugs during the hatching of eggs until the larval 2 instar; second, use only 1 or 3 times per year, and do not use them frequently to prevent the development of resistance. The third is to use it alternately with other pesticides. The following medicines are available: BT (Bacillus thuringiensis) suspension 500 to 800 times, 2.5% vegetable jelly suspension 1500 times, 5% vegetable jelly suspension 1000 times, 5% Sodium alcohol emulsion 1500 to 2000 times liquid , 5% stuck grams (flubendiamide) 2000 times the cream of liquid, dilute 1500 ~ 3000 times and so on.
Nocturnal moths occur in summer and autumn every year, and the occurrence of nocturnal moth pests is severe, mainly Spodoptera litura and Spodoptera exigua. The newly hatched larvae clusters feed near the egg masses and, after 4 years of age, enter the gluttony phase and can eat whole field crops as polished rods. You can also drill green peppers, tomato fruits and cabbage, Chinese cabbage leaves. The critical period of the chemical control of the larvae of the noctuid moth is before 3rd instar, and it can be sprayed with 25% diafenthiuron 1500 times, 20% diflubenzuron No. 1 1000 times, or 15% avermectin chlorpyrifos 1500 times. When spraying, pay attention to alternate use of multiple agents to delay drug resistance. Nocturnal larvae are nocturnal and should be sprayed in the evening.
The dish worm is commonly known as the worm, which is a borer pest. It mainly damages the heart and growing points of cruciferous vegetables. The seedlings often stop growing or wilting to death due to the destruction of the growing point, and can also spread soft rot. In the period of adult emergence, larval hatching or initial emergence of new leaves, use 90% crystal trichlorfon 800-1000 times, 50% phoxim EC 1000-1500 times, 40% chrysanthemum or chrysanthemum Emulsion 2000 times liquid spray, continuous spraying 2 or 3 times, you can control the damage.
The yellow stripe mainly harms cabbages, cabbages, radishes, etc. of cruciferous plants, and also harms the solanaceous vegetables, melons, and legumes. Harm to adults and larvae. Adults bite leaves into countless holes, affecting photosynthesis. When severe, the entire vegetable seedlings die. The larvae harm the roots in the soil, eat the root bark, etc., and bite off the fibrous roots. In severe cases, the above-ground leaves of the plant wilts and die. In addition to directly damaging the vegetable strain, the worm can also spread bacterial soft rot and black rot, causing greater harm. For adult control, 2.5% dipterex powder can be used for 2~2.5 kg/mu, or 90% crystal trichlorfon 800~1000 times, 50% phoxim EC 1000 times, and 2.5% deltamethrin EC 2000 times. Spreading evenly from the perimeter of the plot; control larvae, and irrigate the roots with 90% crystal trichlorfon, 50% phoxim, 50% dichlorvos, or 50% malathion, with good results.
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