Cauliflower planting diamondback moth is very common, how to control it?

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.

It is difficult 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.

Diamondback moths generally grow and develop around April-June and October, and the number of diamondback moths in April-June is higher than that in autumn. If it is rainy in summer, diamondback eggs, larvae and pupae will be seriously damaged due to high humidity, and if there is a drought in summer, it is not conducive to diamondback moth reproduction, but sometimes it will occur in large quantities.

The larvae of diamondback moth feed a small amount, and eat the lower epidermis and mesophyll, so that the cabbage leaves present a "skylight" shape, and the amount of food intake increases sharply after the 3rd instar, and the young leaves can be eaten into holes. Adults generally like to lay eggs on the leaf surface, the back of the leaf, and the main vein, mostly in the depression between the veins on the back of the leaf, some are scattered, and some are clustered together.

There are several reasons why diamondback moths are more difficult to prevent:

1. Small body, as long as there is a small amount of food, it can survive, and it is easy to avoid enemies.

2. The life cycle is short, and when the temperature is 28-30 degrees, it only takes 10 days to complete the generation.

3. Strong reproductive ability, with an average of 220 eggs per female, and scattered eggs.

4. The oviposition period of the overwintering generation of adults can reach 90 days, which causes serious overlapping generations and is difficult to control.

Due to the long-term use of chemical pesticides for prevention and control, a large number of killing and injuring natural enemies, diamondback moth is more and more harmful day by day, and soon developed a very high level of resistance to various chemical pesticides, in the 90s of the last century, many places in the face of diamondback moth rampant, there is no cure. Due to the large occurrence area, long damage time, and difficult control, diamondback moth gradually replaced cabbage worm and became the No. 1 pest of vegetables.

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.

Prevention and control methods: 1. Strengthen the management of water and fertilizer, enhance the disease resistance of plants, and remove diseased leaves to reduce the source of damage. 2. Before sowing, you can use Fumei double wettable powder to dress seeds, which can reduce its incidence, and at the same time, you can use chlorothalonil or mancozeb wettable powder for Enshi in the early stage of the disease, about ten days or so to spray once, three times in a row can have an effect.

<> mainly harms leaves, petioles, peduncles and horns. Both seedlings and adults can be damaged. The leaves are damaged, showing nearly circular green spots at first, and after enlargement, they are dark brown in the middle, pale green on the edges, with or without obvious wheel lines.

When wet, the surface is densely covered with black mold. Crop rotation with non-cruciferous crops. At the beginning of the disease, 500 600 times of 75% chlorothalonil wettable powder, or 1 500 times of 50% promethanin wettable powder, sprayed once every 7 10 days, and sprayed 2 3 times in a row.

In the peak stage of larvae, 200 times of BT emulsion is used, or 5% anti-tapo emulsifiable liquid, and 5% Ruijin special suspension is used in the peak stage of egg hatching, 17ml-34ml per 667 square meters, 50L-75L of water, or 2000 times of 5% anti-tapo emulsifiable concentrate, or 3000 times of avermectin emulsifiable concentrate before the larvae are sprayed before 2 instars. The above agents should be rotated and used alternately, and a single type of pesticide should not be used continuously all year round.

The damage period of aphids is relatively long, and it can be harmful during the whole growth and development period of cauliflower. It mainly sucks the leaf sap by nymphs or adults, and gathers into a clump on the back of the leaves, secreting yellow honeysdew to cause the cauliflower leaves to turn yellow and eventually fall off. In addition, aphids are also vectors for the spread of viral diseases, causing plants to yellow, or even die.

The principle of timely, appropriate, scientific use and alternate use of pesticides is the principle. It can be sprayed with 50% anti-aphid wettable powder 1 000 times, or 2000 times of cypermethrin emulsifiable concentrate, 10% imidacloprid 2 000 3 000 times liquid control or aphid lice net, spraying 1 time every 5 7 days, spraying 2 3 times in a row.

We must pay attention to management, manage in accordance with reasonable methods, and make reasonable arrangements for fertilization. Before sowing, it is necessary to mix the seeds with Fumei, which can reduce the incidence to a certain extent. Some pesticides can be used and sprayed on time to prevent pests.

1.Physical method: using the phototaxis of pests, set up a frequency vibration insecticidal lamp or black light in the field to trap and kill insects; It is also possible to use the tropism of Spodoptera exigua, diamondback moth and other sex pheromones to place a set of sexual attractants in each acre of the field to trap and kill insects; Foliar spraying of the new high-lipid film forms a layer of physical polymer film, which optimizes the quality of water absorption, breathability and light transmission of plants.

Shielding pest and disease feeding signals and weakening the vector.

2.Biological methods: Biological agents can be sprayed at the early age of pests.

3.Chemical methods: can be targeted chemical spray prevention, the use of chemical pesticides must be used with the new high lipid film, can be modified high toxicity pesticides for poisoning, poisoned pesticides for low toxicity, low toxicity pesticides for micro toxicity.

Control the volatilization of pesticides, prevent light rainwater erosion, reduce the amount of pesticides per mu by half, and improve the prevention and control effect many times.

1. Weeding and ploughing. The weeds in the field should be cleaned in time, and the land should be deeply turned to eliminate overwintering pupa. After harvesting, the remnants and leaves should be removed in time to reduce the number of cabbage insects.

2. Cultivate insect-free seedlings. Use insect nets to raise seedlings to prevent cabbage worms from laying eggs on seedlings.

3. Rational use of pesticides for prevention and control. It needs to be sprayed at the peak of the first and second instar larvae for control.

A relatively common vegetable in daily life, cauliflower is a semi-hardy, adaptable vegetable, it is generally grown in rural areas in the north and south, and the time to grow cauliflower in the open field is generally carried out in the two seasons of spring and autumn. Control the number of watering and watering at the seedling stage, the seedling age is 45 to 60 days, you can plant, do a good job of thermal insulation in the early stage of growth, after the weather becomes warmer, timely top dressing, pay attention to fertilizer and water during the flower bulb expansion period, combined with cultivating and weeding, and maintain the humidity of the soil.

The epidermis is left behind, forming transparent spots on the leaves, forming leaf cavities; The 3 to 4 instar larvae of diamondback moth can feed on the leaves into holes and nicks, and in severe cases, the whole leaves are eaten into a net. At the seedling stage of crops, the central leaf is often harmed, affecting the core. The amount of seeds in each hole is three to four grains, and then the seeds are covered with soil.

When sowing, one of the things we need to pay attention to is to water the soil before sowing so that the soil has enough water to maintain the growth and development of the seeds.

Planting in the open field begins in mid-to-late March, and harvesting is available in mid-to-late May. If you sow seeds in autumn, they are usually sown in early to mid-July, planted in the open field in early August, and harvested in mid-to-late October. According to the ditch 1 5 meters of land preparation for furrowing, deep ditch high furrow, spray herbicide Henes or butachlor after land preparation to prevent weeds.

If conditions permit, it is necessary to use plastic film mulching for cultivation, which can not only improve soil temperature, protect moisture and prevent waterlogging, and reduce the harm of weeds, but also is a semi-cold-tolerant vegetable. It is not resistant to heat and drought, nor is it resistant to frost. Its growth does not require strict light, and it prefers an environment with sufficient sunlight.

Normal temperatures between 10 and 25 degrees Celsius are appropriate.

When we plant cauliflower in the countryside of Northwest China, we plant it in greenhouses in the twenties of the first month, transplant it on the ground from March to April, and plant it on the market in May 20. Generally, it is planted when the seedling age is 25-30 days old and the true leaves are 5-6. Do not have too long seedlings, so as not to "flower bulbs appear early" and lose their commodity value.

Planting should not be too deep, and it is advisable to be half a finger deeper than the soil seal at the seedling stage, otherwise the seedlings will not be prosperous.

One is to use pesticides, but this should not be more than 3 times a month, after all, it is a dish to be eaten, and it is not good to use too many pesticides. The other is to use the greenhouse breeding method, the implementation of the covered breeding method, can also avoid a lot of pests and diseases. The last one is to regularly inspect the field to see what pests and diseases are and deal with them according to the actual situation.

First of all, it is necessary to ensure the fertility of the soil in the planting area, there is also to ensure the right temperature, and it must be ventilated in time, there is to ensure that the water and fertilizer are sufficient, and it is necessary to choose the right pesticides to kill insects.

Pesticides must be sprayed in the early stage, and the management of ventilation must be strengthened, so that pests can be prevented.

When planting cauliflower, it is generally according to the local climatic conditions and planting environment to choose strong disease resistance, full particles, uniform size, no diseases and pests, about 1 2 years of high-quality seeds to sow seeds, generally choose such cauliflower seeds to sow seeds, seedlings will grow more robustly, conducive to the growth of cauliflower in the later stage, improve the stress resistance of cauliflower, so as to reduce the occurrence of eggplant diseases and pests. Soaking seeds to promote germination in the selection of cauliflower varieties, generally before sowing, the seeds of cauliflower are soaked in about 30 warm water for about 15 20 minutes, in the process of soaking seeds, the deflated seeds floating on the water surface are removed, and then the seeds are scooped up and drained, the seeds are wrapped with a clean and hygienic wet sand cloth, and then the wrapped cauliflower seeds are placed in the environmental conditions of about 25 28 for germination, generally 2 3 days later will sprout, then you can basically carry out sowing.