How to control cabbage worms, and how to control cabbage worms

Methods for controlling cabbage worms steps.

1. Clean up the garden or vegetable field in time. When cabbage insects are found foraging on the leaves, the missing leaves should be removed in time.

2. After harvesting vegetables, it is necessary to quickly renovate the soil and eliminate insects**.

3. Eliminate adult worms. Cabbage caterpillars are phototaxis and can reduce the number of eggs laid by placing black light during the adult period, guiding it forward in an induced manner and killing it in large numbers.

4. Manual capture. Use a prepared insect net to catch larvae or adults early in the morning.

5. Rational and scientific use of drugs. The larvae are very weak in their resistance and are given drugs until the third age before the eggs begin to hatch, which kills a large number of insects.

1. After harvesting, it is best to plough the plots where radishes, cabbage, and cabbage are planted in spring and summer stubble. Because the temperature is high now, there are no larvae, but the eggs are difficult to see. After ploughing, the use of sunlight can also reduce the occurrence of cabbage insects.

At the same time, hanging yellow plates in the field can reduce the number of adults and reduce the harm. This is a type of agricultural control, and the number of eggs is small, and it is also suitable for small area planting.

2. When the effect of agricultural prevention and control or soil method is poor, it is necessary to carry out pharmaceutical prevention and control in time, on the one hand, it is necessary to choose the appropriate agent, and on the other hand, the period of drug use is very critical. The agents used to control cabbage worms include cyhalothrin, emamectin salt, chlorantraniliprole and so on. Some plots can be controlled by spraying a single spray in the early stage of the occurrence of cabbage worms, but some plots have poor control effects, and some insecticidal and egg-killing agents can be used.

When growing vegetables, they are often harmed by cabbageworms, which can cause serious reductions in the quality and yield of vegetables. If pesticides are sprayed to control cabbage insects, it is not only easy for pests to develop resistance, but also easy to cause pesticide residues. White vinegar + dish soap.

This method is only suitable for the egg-laying period and larval hatching period of cabbage worms. If you can't get the oviposition period, you can spray it when you can't see the insects on the leaves to prevent it, because the white vinegar, dish soap and potassium dihydrogen phosphate are mixed, which can not only effectively inhibit the hatching of cabbage larvae and kill cabbage larvae, but also serve as foliar fertilizer. Spray evenly with 100 grams of white vinegar + 50 grams of dish soap + 100 grams of 99% potassium dihydrogen phosphate, mixed with 15 20 kg of water.

If the vegetables have worms, it is best to sprinkle some soot nearby, so that he can't grow Chong, and you can use some insect repellents.

1. Select improved varieties: choose varieties with excellent varieties and strong disease resistance. 2. Disinfection of plots:

After the soil has been turned, the surface is sprinkled with disinfectant powder or irradiated with ultraviolet light. 3. Spraying pesticides: spraying dichlorvos or trichlorfon solution for crops.

4. Biological control: introduce the natural enemies of cabbage insects, and then eliminate them.

1. Choose good breeds

In order to prevent and control the invasion of cabbage insect, varieties with excellent varieties and strong disease resistance can be selected before sowing, and the maturity period of varieties should be early, so as to effectively avoid the peak incidence period of cabbage insects and reduce the threat of insect pests.

2. Disinfection of plots:

The second way to prevent cabbage insects is to disinfect the soil before planting, which can be done by sprinkling disinfectant powder on the surface after the soil is turned, or by using ultraviolet radiation to kill the eggs in the soil and reduce the occurrence of insect infestations.

3. Spray pesticides

For large-scale planting of crops, spraying pesticides is a very direct and effective method of prevention and control, spraying time should be selected in the morning of a sunny day, pesticides generally choose dichlorvos or trichlorfon solution, pay attention to the concentration should not be too large, so as to avoid pesticide damage.

4. Biological control

There are many natural predators of cabbage worms, such as spiders, ladybugs, praying mantises, dragonflies and other creatures, which can be used to kill cabbage worms on the greens by biological methods, or homemade pepper water to spray cabbageworms on the leaves of the plant.

1. Disinfect the soil before planting. It can be sprinkled with disinfectant powder or irradiated with ultraviolet light. Kills eggs in the soil. Reduce the occurrence of pests and diseases.

2. It is best to choose the way of crop rotation, don't plant vegetables all the time, you can make some other plants. This can effectively reduce pests and diseases.

3. You can use manual capture methods. In the early morning or late afternoon of the day, it is the time for cabbage worms to eat, and at this time they will be infested in large numbers. Once you can see it, capture it and destroy it.

4. Spray pesticides. For large-scale planting, spraying pesticides is a very effective control method.

5. Use biological methods for prevention and control. Cabbage worms have many natural predators, such as spiders, ladybugs, and praying mantises. Dragonfly. and other creatures are their natural enemies, and the introduction of these small animals can use biological methods to kill the cabbage insects on the greens.

Vegetable insect hazard control methods: agricultural control, biological control, chemical control.

1. Agricultural prevention and control.

Rational layout, try to avoid cruciferous vegetables annual continuous cropping. Within a certain time and space, cut off its food source. After the cruciferous vegetables are harvested, the field residues are removed to eliminate the remaining larvae and pupae in the field.

In early spring, you can cover the mulch film to advance the planting period of cabbage in early spring and avoid the damage of the second generation of cabbage insects.

2. Biological control.

Protect and use the Rising Orange Reed Enemy. During the occurrence of a large number of natural enemies, care should be taken to minimize the use of chemicals, especially pesticides with broad spectrum and long residual effect. Release natural enemies such as butterfly pupae and red-eyed wasps.

Use BT emulsifiable concentrate spray, or rapeseed butterfly particulate virus and parasitic nematodes, etc.

3. Chemical control.

The chemical control of rapeseed butterflies should be based on the occurrence period and the established control indicators, comprehensive consideration of climate, natural enemies and the remaining period of vegetables, to determine the appropriate period of control. Generally, the commonly used agents are, 90% crystal trichlorfon 1000 1500 times liquid, or 50% dichlorvos emulsifiable concentrate 1000 times liquid spray and so on.

Introduction to cabbage worms

Vegetable butterflies, also known as cabbage butterflies, larvae, also known as cabbage insects, are the most widely distributed and most serious pests in China, and often fail to become disasters. There are as many as 35 known host plants in 9 families, and they are fond of cruciferous plants, especially cabbage, cauliflower, cabbage, and radish with thick leaves. In the absence of cruciferous plants, other host plants can also be eaten, such as Asteraceae, broccoliaceae, nasturtium, lily, comfrey, rhinoceraceae and other plants.

The larvae bite the host leaves, only eat the mesophyll before the 2nd instar, leaving a layer of transparent epidermis, and eat away at the leaf holes or missing nicks after the 3rd instar, and the leaves are all eaten up when the leaf is noisy, leaving only the coarse leaf veins and petioles, resulting in extinction, which is easy to cause the epidemic of cabbage soft rot. When the damage is serious at the seedling stage, the whole plant dies at the worst, and the core is affected at the lightest.

The above content refers to Encyclopedia - Vegetable Powder Butterfly.

The call of cabbage pests and insect pests is the most headache for growers, which seriously affects the yield of vegetables and the commerciality of vegetables. So what are the control measures for the insect pest of vegetables - cabbage worm?

The adult cabbage insect is called the cabbage butterfly, which is the most important pest of cruciferous vegetables, and there are 5 kinds of pink butterflies that harm cruciferous vegetables in China, all of which belong to the Lepidoptera, the family Pink Butterfly. Brassica insect mainly damages leafy vegetables. Among them, cruciferous vegetables such as cabbage, radish, Shanghai greens, and cauliflower, especially some green vegetables with thick leaves.

Symptoms of cabbage worms: cabbage worms are mainly harmed before the 2nd instar larvae, mainly by gnawing on the mesophyll, and leaving a thin layer of leaf epidermis, when the cabbage insects rise to the 3rd instar, the damage often causes a gap or hole, and the leaves may be eaten up when it is serious, leaving only the petiole or leaf vein. After the cabbage insects are harmed, they not only eat the plants, but also excrete feces, causing the vegetables to be inedible, the yield is reduced, and even the harvest is lost.

The 4th-5th instar larvae are the most serious insects of cabbage insects, which can reach more than 95% of the whole larvae.

The growth habit and occurrence law of cabbage insect: cabbage insect occurs in the main vegetable producing areas of China, especially in Shandong and Henan, from March every year, and the damage is most serious in the two periods of May-June and September-October. From July to August, due to the increase in rainfall, the damage of cabbage insects decreased and decreased.

Adults are mostly harmed at noon on sunny days, and lay eggs, often lay eggs on the back of the leaves, so when the larvae hatch, the larvae are first harmed on the back of the leaves, and the back of the leaves should be sprayed when using medicine, which can better play an insecticidal effect.

Prevention and control measures of cabbage insects: due to the vigorous promotion of greenhouse vegetables in recent years, conditions have been created for the occurrence of breeding hazards of cabbage insects year after year. In the prevention and control of drugs, the dosage is also increasing, resulting in the resistance of cabbage insects to drugs increasing year by year, and it is difficult to prevent and control.

Therefore, it is necessary to alternate the use of drugs when taking drugs to reduce the emergence of drug resistance.

1. Agricultural control: continuous cropping with non-cruciferous vegetables, after the crop is harvested, the residues and weeds are cleaned up to reduce the source of insects in the field. 2. Biological control.

Before the 3rd instar stage of larvae, use 100-300g of 8000IU mg of Bacillus thuringiensis wettable powder or 200-300ml of 2000IU of Bacillus thuringiensis suspension mixed with water 30-45kg dilution spray per mu. 3. Chemical control: 2000-3000 times of 40% chrysanthemum emulsifiable concentrate, 2000-3000 times of 40% chrysanthemum emulsifiable concentrate, 1500 times of 50% phoxanthion emulsifiable concentrate, etc.

1. Prevention and control methods of cabbage insects

1. Agricultural prevention and control.

1) Try to avoid continuous cropping with cruciferous vegetables.

2) After the crop is harvested, the residues and weeds in the field should be cleaned up in time to reduce the source of insects in the field.

2. Biological control.

1) Release natural enemies of cabbage insects such as butterfly pupae golden wasps, red-eyed wasps, and reddish cocoon wasps in the field.

2) Foliar spray of BT wettable powder 800 times.

3) Before the 3rd instar stage of larvae, use 100-300g of 8000IU mg of Bacillus thuringiensis wettable powder, or 200-300ml of 2000IU L Bacillus thuringiensis suspension mixed with water 30-45kg dilution spray per mu.

4) Use rapeseed butterfly particulate virus agent for prevention and control.

3. Chemical control.

At the peak of larvae, use a chemical to kill cabbage insects, spray every 10-15 days, a total of 2-3 times. Common agents are 40% chrysanthemum EC 2000-3000 times, 40% chrysanthemum EC 2000-3000 times, 50% phoxanthion EC 1500 times, 10% Uranus EC 8000-10000 times, 20% Mapelik EC 3000 times, 25% chrysanthemum EC 2000-3000 times, 21% kill EC 4000-5000 times, 10% cypermethrin EC 2000-3000 times, 5% Nongmengte emulsifiable concentrate 3000 times, Kung Fu emulsifiable concentrate 4000-5000 times, 20% 2000-3000 times emulsifiable concentrate.

2. What is the adult worm of cabbage worm?

1. The adult of the cabbage insect is the cabbage butterfly.

2. The body length of the butterfly is 12-20mm, the wingspan is 45-55mm, the body color of the male is milky white, and the female is light yellowish white. The anterior edge and base of the forewings of the female are mostly black, with a large triangular black spot at the apex angle, two black round spots on the outer side of the middle wing, and a grayish-black base of the hindwings, with a black spot on the front margin. The front of the forewings of the male is grayish-black, and there are two black spots in the middle and lower parts of the wings (the front black spots are more pronounced).

3. The butterfly egg stage is about 4-8 days, the larval stage is about 11-22 days, the pupal stage is about 10 days (non-overwintering pupa), and the adult stage is about 5 days.

<> physical control: clean the countryside, remove the stumps and old leaves and weeds in the field in a timely manner, deeply and carefully rake the ploughing, reduce the stupidity and reduce the source of overwintering insects; Protect the natural enemies of cabbage insects such as the red-eyed Jane bee, the reddish velvet cocoon bee, and the butterfly golden wasp. Biological control:

Before the 2nd instar of the larvae, 1% insecticide emulsifiable concentrate (2000-2500 times liquid) or insecticide emulsifiable concentrate (1000-1500 times liquid) and other drugs were used for spraying.