Bemisia tabaci on persimmon trees are very common, how to control tabaci on persimmon trees with med

When whitefly swarms are harmed, it can secrete dense dew, attract ants, insects and create an environment for mold growth, induce bituminous coal disease, and can spread viral diseases at the same time, if not controlled in time, it can cause a decline in fruit and vegetable yield and a decrease in commerciality. Migratory properties of B. tabaci tabaci. Although most of the whiteflies are eliminated by the pesticides, whiteflies from other fields still migrate here.

Sap is sucked out of the infested plant. To control it, we can first attack these insects from multiple angles, introduce their natural enemies into orchards or gardens, hang traps, and regularly inspect infested plants. Since six years of enzyme ecological planting practice, through the principle of ecological prevention and control of enzymes, the harmonious coexistence of insects and plants has been solved, because enzymes have the effect of decomposing insect eggs and are the euthanizer of insects.

At the beginning of February, scrape off the old bark at the base of the trunk, apply sticky shellac about 10 cm wide, prevent the adults and nymphs of the tree, and use a brush every day to remove the adhered dead insects, and the effect is good. When the female lays her eggs, she digs a pit around the base of the trunk and puts some leaves in it.

This is the persimmon lice, persimmon lice is also called persimmon scale insect, with adults and nymphs to harm the branches and leaves and fruits of persimmon trees. After the occurrence of persimmon lice in persimmon trees, the appearance and practical value of the fruit are seriously affectedFor insect pests, most pests need a place to overwinter, such as weeds, dead branches and leaves, corner cracks, seeds, etc., which are good places for them to parasitize and hide.

Therefore, it is necessary to remove the cultivated soil, internal and external environment, and field weeds.

If the amount of lice is large, you can only spray some pesticides, spray insecticides such as 100 tinctures, 100 insects, disinfectants, etc., spray 3 or 4 times in a row, once a week, you can also self-medicate, liquor and water ratio 1:2Spray once every half month, about 4-5 times of wine is no problem, persimmon scale insect reproduction fast, harmful, mostly nymphs and female adults cluster on the persimmon leaf surface, branches, fruit sap, can cause persimmon leaf curling, the surface of the fruit is uneven, but also induce soot disease, so that persimmon fruit loses its commodity value.

This kind of insect can be controlled with imidacloprid, and generally spraying 2 or 3 times can have obvious effects.

Because whitefly is very resistant, in order to delay the resistance, several pesticides should be used in rotation and with several formula drugs in order to effectively control whitefly on persimmon trees.

It is necessary to do prevention in advance, and after the persimmon tree blooms, it is necessary to spray pesticides immediately to clean up this fungus, and there will be no such insects.

1.Physical control.

Whiteflies have a strong tropism to yellow, especially orange-yellow, and yellow plates can be set up in the greenhouse to trap adults. Set 25-30 sheets per acre, placed at the same height or slightly higher than the plant. After 7-10 days, replace when the yellow plate is full of worms or the stickiness of the swatch is reduced.

2.Biocontrol.

Release natural enemies such as aphid wasps and ladybugs into the greenhouse to achieve the purpose of "treating insects with insects".

3.Pharmaceutical prevention and control.

In the early growth of cucumbers and tomatoes, when whiteflies first appear in greenhouses, cyantraniliprole 10% dispersible oil suspension milliliter mu spray control can be used, and then sprayed once every 7 days after recurrence, with a safety interval of 3 days. At the same time, pay attention to the selection of snail thiamloprid 22% suspension 30-40 ml mu (safety interval of 3 days). It can also be smoked with 3% cypermethrin aerosol agent, 300-400 grams per mu.

In order to enhance the effect of the potion, it should be used alternately.

The drugs suitable for the prevention and control of whitefly are acetamiprid, clothianidin, mineral oil, thiamethoxam (Actey), dimethoxam, pymetrozine, bifenthrin, avermectin, matrin, imidacloprid, chlorpyrifos, etc., which can be used to control whitefly on persimmon trees.

Long-term monotherapy, whitefly is prone to drug resistance. At present, B. tabaci has developed varying degrees of resistance to a variety of commonly used insecticides such as organophosphorus, pyrethroids and carbamates, and in some areas, B. tabaci has strong resistance to insect growth regulators and nicotinic insecticides. In areas where whitefly is resistant to commonly used fungicides, dimidoxamin, pymetrozine and other drugs can be used for control.

In addition, the new 240 g L spirocarp ethyl ester suspension launched by Bayer CropScience in Germany has a good control effect on stinging and sucking mouthparts pests such as whitefly, which can effectively control pests resistant to existing insecticides, and can be used as an important variety for nicotinoid insecticide resistance management. Generally, it is used in the peak incubation stage of Bemisi whitefly eggs to the young nymph stage, diluted 2000 3000 times spray. The drug has strong systemic property and can conduct in both directions in xylem and phloem, but the quick-acting effect is poor, and it does not kill adult insects, and it should be mixed with avermectin, chlorpyrifos and other drugs when there are more adult worms.

B. tabaci (1) cultivate insect-free seedlings When raising seedlings, the seedbed should be separated from the production greenhouse, thoroughly disinfected before the seedlings are raised, and the seedlings should be cleaned up before planting when there are insects, so that the cotton seedlings planted are insect-free.

2) Use aphid wasps to control whiteflies, when each cotton plant has whitefly heads, each plant has 3-5 bees, 1 time in 10 days, and 3-4 times in a row, which can basically control its pest.

3) Pay attention to the arrangement of stubble and reasonable layout In greenhouses and greenhouses, cucumbers, tomatoes, eggplants, peppers, beans, etc. should not be mixed, and if conditions permit, they can be interplanted with celery, leeks, garlic, garlic, etc., to prevent the spread of whiteflies.

4) Early medication in the early treatment of whitefly sporadic occurrence began to spray 20% parametriol wettable powder 1500 times liquid or 25% acaricidal emulsifiable concentrate 1000 times, Uranus emulsifiable concentrate 3000-4000 times, kung fu pyrethrin emulsifiable concentrate 2000-3000 times, 20% exacerbate emulsifiable concentrate 2000 times, 10% imidacloprid wettable powder 1500 times, every 10 days or so, 2-3 times in a row.

5) The whitefly in the shed can be used to apply the tobacco agent with a knapsack or motorized smoke generator, and the dosage of the drug should be strictly controlled by this method to avoid pesticide damage.

6) Cassava cuttings from the tropics, African islands and India must be treated with insect control to prevent the spread of the insect.

Bemisi tabaci is one of the main pests of many agricultural bridge seeps today. The harm of B. tabaci to host plants is manifested in direct feeding, honeydew secretion, coal stain disease and plant virus disease. They pierce the mouth needle into the phloem to directly feed on plant juice, causing the host to be nutrient deficient, affecting the normal physiological activity and sensitivity, resulting in plant weakness.

At present, the commonly used prevention and control measures are:1Agricultural control.

That is, by creating a small environment that is not conducive to the reproduction of whiteflies and the viruses they transmit, the purpose of controlling the number of pests is achieved. 2.Physical control.

That is, according to the characteristics of Bemisi tabaci with strong tropism to yellow, orange-yellow plates coated with sticky oil can be used to trap adults in the greenhouse. The method is: use 1 meter of fiberboard or cardboard, painted orange yellow, and then coated with a layer of sticky oil (you can use No. 10 oil and a little butter to mix thoroughly), set up 32 34 pieces per 667 square meters (1 mu), placed between the rows, consistent with the height of the plant, and the yellow board needs to be recoated once in 7 10 days.

3.Biocontrol. The natural enemies of whitefly are abundant, its parasitic natural enemies include Aphid wasp, etc., predatory natural enemies include ladybugs, lacewings, bugs and predatory mites, etc., and parasitic fungi include Penicillium saxi, Verticillium cereus, Beauveria bassiana, etc.

The natural enemies of B. tabaci have considerable inhibition ability to B. tabaci and should be protected and utilized. 4.Reasonable chemical prevention and control.

It is mainly used to prevent the accumulation of resistance genes by means of mixing and alternating the use of pesticides with different mechanisms of action, so as to reduce, delay or prevent the emergence of resistance. The available agents are avermectin EC (Afedin) 2000 3000 times, 40% avidichlorvos EC (Green Caibao) 1000 times, 25% thiazinone wettable powder (paramefen) 1000 1500 times, 10% imidacloprid wettable powder 2000 times, 5% fipronil suspension (Ruijinte) 1500 times, etc., these agents are efficient, low toxicity, relatively safe for natural enemies, and have a good control effect on whitefly. (Shanghai Pesticide Control Institute, Xu Hui, Zip code: