Diamondback moth control insect growth regulator, how effective is this?

Many farmers are troubled by the crazy reproduction of diamondback moth, which seriously affects the growth and harvest of crops, and many people use insect growth regulators to control diamondback moth, so what is the effect? Let's take a look.

The benzoylurea substances in insect growth regulators can inhibit the activity of chitin synthase after being eaten by pests, thereby hindering the formation of new epidermis, causing difficulties in molting larvae, hindering their development and death. Because this type of insecticide acts from a physiological barrier, it is different from previous chemically synthesized insecticides (such as organophosphorus, carbamate, pyrethroids, etc.). It is a nerve agent, that is, inhibits cholinesterase, so it has a good effect on pests that have developed resistance.

In recent years, it has been used for the prevention and control of resistant diamondback moth in China's coastal areas, such as 5% carnock EC 1000-2000 times, 5% fluorodine urea EC 1000-1800 times, 5% cover powder EC 1000-1500 times, 20% pyrethuron suspension 500 times, etc., can be used, and is conducive to the development of sustainable agriculture. <>

At present, China is also actively organizing research and development, and new varieties are constantly emerging, such as 20% flubellura suspension (produced by Guangzhou Pesticide Factory and Jiangsu Yixing Biochemical Plant), which is being trialed. This kind of preparation mainly has the effect of stomach toxicity, which produces an effect when the larvae molt, so the effect is not as good as the chemical insecticide with nerve agents, but the effect is long, especially in the form of emulsifiable concentrate, which can be adsorbed under the foliar surface after spraying, not afraid of rain, and the duration of the effect can reach up to 20 30 days. Therefore, it is very effective in the early and juvenile stages of diamondback moths.

It is important to note that the frequent use of such preparations can also make diamondback moths resistant. Therefore, it is recommended that if this type of preparation is used in one area, it can only be used once or twice a year, and alternately with organophosphorus, carbamates, and pyrethroids to delay the development of drug resistance.

The effect is very good, this method can effectively prevent pests and diseases, and can also ensure the quality of vegetables, many people will use this method.

The effect is still very good, and this thing is also specially developed as a vegetable, and it is also very convenient to use.

The effect is still quite significant, and it can prevent this kind of vegetable moth very well, and at the same time can also ensure the yield of vegetables, indicating that it is still effective.

The reasons for the difficulty are: First, they are relatively small in size and difficult to find. Second, they have a strong ability to survive.

Third, they are highly resistant to chemical pesticides. Fourth, they have almost no natural predators. Fifth, they are very reproductive.

Diamondback moth must be controlled in a timely manner.

Because these diamondback moths rely on vegetables to survive, their vitality is very tenacious, so it will be very difficult to remove them.

Because this animal is very small, it can survive by eating very little, can better avoid enemies, and is also very adaptable.

That's right.

The diamondback moth in the vegetable field is a pest that has a major harm to crops around the world, not only has a strong reproductive ability, but also has a very strong ability to resist slag pesticides, it is difficult to be completely eliminated by pesticides and other insecticides, which has an extremely serious harm to crops, and is also a problem for the growth of crops at present.

The habits of diamondback mothsLarvae, pupae and adults can overwinter and summer in all kinds of insect states without diapause. There are two spikes in damage throughout the year, the first of which is from mid-May to late June.

The second time is from late August to late October (during the season when cruciferous vegetables are cultivated in large areas). In general, autumn damage is heavier than spring damage in general. The suitable temperature for the development of diamondback moth is 20-30 degrees Celsius, and the first generation is completed in two peak periods for about 20 days.

It is difficult for growers to control diamondback moth, on the one hand, because of the lack of knowledge about its life history and larval occurrence characteristics. On the other hand, the diamondback moth has concealment, in the early stage of feeding on the leaves, the feeding point is needle-like size, it is difficult for growers to find, and when it is found that the obvious symptoms of eating mesophyll are harmful, the larvae are already in the third instar or more, and its drug resistance is strong, which is the key to causing difficult control.

Prevention and control methods:1. Avoid the high incidence of insect pests and clean the countryside. Arrange the stubble reasonably to avoid the peak period of diamondback moth damage at the seedling stage.

After the leafy vegetables are harvested, clean the field in time to reduce the source of insects. 2. Implement crop rotation and intercropping to cut off the food chain of pests. When planting, avoid cruciferous vegetable continuous cropping as much as possible, especially in summer, to control the peak of autumn damage.

3. The protection and utilization of natural enemies, with diamondback moth as the target of attack. 3. There are many kinds of natural enemies, including parasitic bees, predatory insects and pathogenic pathogens. A large proportion of diamondback moth larvae are killed by parasitic bees.

These bees are attracted to leaves that have previously been infested by diamondback moth larvae.

Diamondback moths are small in size and easy to hide from predators; Diamondback moths are relatively adaptable; Diamondback moths are relatively resistant and are not easy to kill. Diamondback moths are generally killed by trapping and releasing predators.

The difficulty in the prevention and control of diamondback moth is mainly due to the fact that the first forecast of vegetable diseases and pests has not yet been put in place, the agricultural control measures are not in place, and the farmers' methods of using drugs are improper. Pesticides attached to avermectin and Bacillus schulysa can be sprayed.

Up to now, the China Pesticide Information Network has been able to find 279 registration information about indoxacarb, of which 34 are registered as original drugs (parent drugs); There are 126 kinds of single preparations registered, mainly suspension agents with an effective content of 15% and 30% and water-dispersible granules with an effective content of 30%; There are 119 registration information for mixed products, mainly indoxacarb, emamectin benzoate, brompanil and bifenthrin, commonly known as double-headed pointed nose, heartworm, small caterpillar, etc. It is a lepidopteran pest that mainly harms the leaves of cruciferous vegetables such as cabbage, cabbage, and cauliflower with its larvae. In severe cases, a large number of larvae gather in the heart leaves, leaving the upper epidermis and forming a transparent "skylight" on the leaves, so the yield and quality are reduced.

Diamondback moth can occur in 3 to 6 generations a year in northern China. It overwinters on the back of pupal leaves or in plants. There are two hazard periods in a year, the first of which is from May to June.

The second peak of the hazard is in August-September, especially in the fall.

For example: bromonethron, indoxacarb, bifenthrin, emamectin benzoate and so on. These are very good low-toxicity pesticides that don't have a very big impact on the environment.

As far as I know, the insecticides with low toxicity of vegetables are acetamiprid, which is used in small amounts, the effect is not bad, and the duration is also very long, and there is a kind of thiamethoxam, which has strong activity and fast insecticidal speed.

Diamondback moth is very common in the process of vegetable planting, and it has strong drug resistance, so it is difficult to remove them with general pesticides, which makes many vegetable farmers feel very helpless. So what should we do to prevent and control this bug? Why don't you follow me and take a look.

1. Crop replacement diamondback moth likes to eat cruciferous vegetables, so you can avoid planting vegetables of this family all the time when planting. There are many vegetables in the cruciferous family, such as camellia, Chinese cabbage, cauliflower, cabbage, cabbage, radish, etc., so vegetable farmers try to avoid planting these vegetables every year when planting vegetables, so as to avoid being harmed by diamondback moths every year, and if these vegetables are planted all the time, it is easy to lead to an increase in the number of diamondback moths in this soil, which is difficult to remove, thus affecting the harvest of vegetable farmers. In addition, when planting vegetables, it is also necessary to remove weeds from the surrounding cruciferous family, which can reduce the occurrence of insect pests.

Second, although the resistance of chemical means is relatively strong in diamondback moth, pesticides are still being updated, so they still have a certain insecticidal effect. When removing diamondback moths, they are generally diluted with 15% indocarcarb water dispersible granules or 20% fibrenimide water dispersible granules and sprayed. Spray once every 10 days to avoid overspraying and causing insect resistance.

When there are no bugs, eat vegetables at a longer interval to avoid pesticide residues.

3. Physical meansBecause diamondback moths have a certain phototaxis, they can use black lights to trap these insects at 8 or 9 o'clock in the evening. Generally, it is enough to wait until about 5 o'clock. Black light can trap diamondback moths very well, with a certain effect, and at the same time, there is no need to contaminate the vegetables with chemicals, as much as possible to protect the vegetables, is a very good choice.

It is necessary to choose the right cultivation environment and soil and temperature, and after seeing this situation, we must kill insects in time, and we must spray pesticides in time, and also water in time.

Some pesticides should be used to prevent pests and diseases, and they should be watered frequently, they should be careful about nutrition, they should be careful about pruning their branches and leaves, and they should be kept in the sun, etc., so that they can be well controlled.

First of all, when planting, you must choose land with relatively fertile and wide soil, and when fertilizing, you must choose farmhouse fertilizer, and do not use fertilizer bought outside. It is also necessary to water more often, to prevent the occurrence of pests and diseases, and if there are small bugs, then be sure to spray insecticides.

Prevention and treatment of specific drugs and methods:

Using Bacillus thuringiensis agent, 8000 IU milliliters per mu, diluted 500 1000 times spray; The dosage should not be too high or.

If it is too low, focus on the control of young larvae, especially the larvae of 1 or 2 instars; Avoid applying pesticides at high temperatures, in sunny afternoons or cloudy days, and should not be applied when the temperature is lower than 15; The pesticide should be sprayed on the back of the leaves.

Use a dosage of 1% emamectin EC 15-25 ml mu, mixed with 50 kg of water spray. In the diamondback moth eggs hatch to the young.

Spray before the 2nd instar.

3.Dosage: 20-40 ml of 5% fipronil suspension, 50 kg of spray per mu with water. Spray diamondback eggs before hatching to larvae 2nd instar.

Fog application. 4.Use a dosage of 35-50 ml of 10% brompronil suspension mu, mixed with 50 kg of water spray. At the peak hatching stage of diamondback moth eggs or larvae 2nd instar.

Spray application before.

Commonly used agents: 25% Caixi suspension 1000 1500 times (spinomycin), avermectin (insect mite light, afordin, aline mite gram) 2000 3000 times, BT Bacillus thuringiensis 1000 1500 times liquid, can also be used 5 Ruijin special 2500 times or 40 profenophos EC 40 grams for better effect.

Application method: master the agent before the peak of egg hatching to the second instar, and spray the back and center of the leaf by the circle method.

Agents include: deltamethrin, phosphine, avermectin, chlorpyramide, anti-Taibao, spinosadin, etc.;

Note: Try to spray the medicine into the heart leaf and the back of the leaf, spray 2-3 times in a row when the insect population density is large, and the interval between 3 days each time is the best time to spray, the larvae hatch in the peak period, to the second instar, during this time the resistance of the pest is the weakest.

I am from Guangdong, and my Deminxin brand Hot Wheels suspension agent has a good effect, and it is effective on the same day after use, and the effective period is also good, so it can be used.

Hello? For your information: you can use deltamethrin 600 times solution, emamectect chlorpyrifos 600 times solution, and avidichlorpyrifos 600 times solution.

Choose any one of the above agents, or use them in rotation, and spray them again at an interval of 7 to 10 days. You can also buy other potions nearby.

Thank you for your question.

Only the effect of compound dispensing is good, single medicine is not good, I use No. 11.