How to use biological methods to control radish maggots?

According to the living habits of radish maggots, it is recommended to adopt the following control methods in the prevention and control:

1.Agricultural control Apply well-decomposed organic fertilizer and apply it evenly and deeply to reduce the chance of adult eggs laying. After the radish is harvested, the field is cleaned up in time to reduce the source of overwintering insects and reduce the damage in the coming year.

2.Physical control During the peak period of adult insects, set up yellow plates in the field to trap and kill adults, and pay attention to timely replacement.

3.Pharmaceutical prevention and control.

In the peak stage of adults, you can choose to use 80% dichlorvos EC 1500 times, or cypermethrin EC 2000 times, or 50% phoxanthion 1000 times, or 20% 3000 times of scavenger, or kill (21% synergistic cyano-horse emulsifiable concentrate) 4000 times and other spray control. The larvae can be controlled by the method of irrigating the roots with pesticides, that is, when the root maggot is found in the field, it can be watered along the roots of vegetables with avermectin 3000 times, or 75% fly amine wettable powder 5000 times, or 50% octathion EC 1200 times, or 48% octadion EC (maggot) 2000 times. Once every 7 10 days, 2 or 3 times in a row, the effect of reducing the damage can be achieved.

Note: It is best to alternate the above agents and stop using them 10 days before harvest.

1. Soak the cabbage seeds and radish seeds in warm water, and then mix the seeds with the ash at the bottom of the pot to make the rapeseed stick a layer of ash at the bottom of the pot.

2. When planting, mix 2-3 grains of salt in each seed.

Or sprinkle a grain of kang seed soil on each seed.

3. Sprinkle a small amount of trichlorfon water above the pit where cabbage and radish are grown.

4. Mix trichlorfon and dimethoate, mix 800 to 1000 times the liquid, irrigate the roots with a spray can, and fill each root to kilograms.

Turnip. Extended Resources:

1. Maggots. Maggots are the larvae of seed flies, also known as root maggots, seed maggots, vegetable maggots, etc., and belong to the family Diptera flower flies. Adults are nearly 5 mm long, yellowish-brown in females and dark brown in males; Pupae about 4-5 mm long, oval, reddish-brown; The larvae are milky white and slightly yellowish, maggot-shaped; The egg is milky white, with reticular lines on the surface, oblong, slightly curved.

The epidermis of the fleshy root of radish is eaten, the wormhole is longitudinal, not reaching the heart, and the epidermis of individual diseased parts is black. The larvae are white, the body length is 2 mm, and the body can be found.

Maggots. 2. Symptoms of carrot spot blight.

Disease spots are found in the leaf margins, which are nearly round, oval, brown to dark brown, without obvious edges, and many small black spots are scattered on the lesions in the later stage. The petiole is diseased, the lesion is spindle-shaped, oblong, dark brown, and there are many small black spots scattered on it, which is the symptom of carrot spot blight. When the onset of carrot spot blight is severe, the leaves are covered with diseased spots or the diseased spots are connected, resulting in early yellowing of the leaves.

Carrot spot disease.

3. Pathogenesis of carrot spot blight.

The pathogen overwinters with the scattered disease residues on the surface and in the soil, and the seeds can also carry the bacteria, which are the primary source of infection. The conidia absorb water and then gush out of the conidia, which are spread by wind, rain and irrigation water, and invade through the stomata or through the epidermis. Disease re-infection is frequent, and disease development is rapid.

The germ prefers warm and humid conditions. Onset temperature 25 .

Fourth, the prevention and control of carrot spot blight.

1. The use of seeds collected from disease-free strains, the seeds should generally be processed before sowing, and 50% of the seed weight of Fumei double plus new high-fat film seed dressing can drive away underground pests and diseases, isolate virus infection, do not affect the germination and swelling function, enhance respiratory intensity, and improve germination rate.

2. Strengthen management, apply sufficient fertilizer, timely top dressing, and increase phosphorus and potassium fertilizers.

Proper irrigation, strengthening the soil after irrigation, and controlling the humidity in the field.

Remove the water from the fields after the rain.

At the same time, in the swelling period of fleshy roots, it is necessary to spray Diguo Zhuang Diling in a timely manner, so that the underground fruit nutrient transmission pipeline is thickened, the fruit expansion vitality is improved, and the carrot fruit surface is smooth, the fruit shape is moderate, and the quality and yield are high.

At the same time, spray 70% mancozeb wettable powder 500 times or 1:1:160 200 times Bordeaux liquid and other prevention and control agents according to plant protection requirements, and cooperate with the spraying of 800 times of the new high-lipid film to improve the utilization rate of effective ingredients and consolidate the control effect.

Radish maggot larvae can be controlled by using pesticide root irrigation, that is, when root maggots are found in the field, avermectin, fly achlor, phosphine, or maggots can be used to water along the roots of vegetables. 1 time every 7-10 days.

If this happens, you need to spray some bactericidal drugs, or sick worm medicines, and so on. In order to prevent this from happening, in addition, do a good job of drying the soil. In this way, you can reduce the amount of radish maggots like this.

It's very skilled, and you can get a technician to train you a little bit.

The root of the cabbage has maggots Introduction: There is sometimes such a problem in the planting process of radish cabbage, that is, maggots, and then rot, so, what should I do with radish and cabbage maggots? How to control radish and cabbage maggots? The following is the first agricultural economy for you to support.

Pesticides. Because after the white radish in my house is sprayed with pesticides, the maggots are gone, so pesticides should be used to prevent and control them.

To ensure the fertility of the soil, to loosen the soil in time, to choose suitable pesticides and fertilizers according to different situations, to ensure the fertility of the soil, but also to water and fertilize in time.

First of all, when planting, we must choose the soil is more fertile and broad land, and we must use farmhouse fertilizer when fertilizing, do not use the fertilizer bought outside, and often water the plants, but also to prevent the occurrence of pests and diseases, if there are small insects, then we must spray insecticides in time.