Whiteflies are commonly known as small white moths
It is an important pest on vegetables
The harm of whitefly is not only reflected in feeding
More importantly
Whitefly secrete a lot of honeydew on the leaves
Causes a large occurrence of coal pollution disease
Affects normal leaf respiration and photosynthesis
Thus reducing the quality of vegetables and fruits
Make vegetables lose their commodity value
Whiteflies are also vectors for transmitting viral diseases
I want to fight viral diseases
First of all, the whiteflies should be cured
And for whiteflies
Vegetable farmer friends reflected
The agent has been sprayed continuously
There is no cure
So what exactly is the reason
This causes whiteflies to be so rampant
And how should it be prevented?
Cause analysis
First of all, heavy treatment and light prevention. Many vegetable farmers only decide to use medicine to treat after the occurrence of whitefed, without realizing the importance of "prevention", which creates a breeding environment for whitefly. It is recommended that vegetable farmers and friends should spray avermectin, imidacloprid and other pest control agents in time after the vegetables are colonized, and prevent them in advance. Do not wait until the whitefly occurs seriously before spraying the drug to prevent it, the effect will be greatly reduced.
Second, improper management. High temperature and drought are the most suitable for the reproduction of whiteflies, especially the high temperature and dry early autumn is the most vulnerable period for whiteflies. In addition, many vegetable farmers have recently removed the insect net, which has also created favorable conditions for whitefly to enter the shed.
Again, the resistance of the agent is enhanced. Vegetable farmer friends have long used a certain kind or a certain type of agent to control whiteflies, resulting in increased resistance of adult insects and reduced control effect.
In addition, the selection of agents only pays attention to insecticidal and not insecticidal eggs. Most of the whiteflies in the greenhouse are eggs, pupae, adult insects mixed, if only the insects are killed, and the eggs and pupae will continue to hatch into adult insects, will continue to harm vegetables.
Prevention and control methods
01
Insect net + armyworm board
At present, do not rush to remove the insect net, the vegetable farmer can set up an anti-insect net at the front face vent and the top vent to cut off the whitefly migration channel. Adult whitefly insects are not good at flying, have yellowing, and hang yellow armyworm plates about 20 cm above the vegetables in the shed, which can effectively reduce the density of the insect population.
In addition, the weeds outside the shed are also parasitic places for whiteflies, so it is necessary to remove the weeds around the shed in time to reduce the source of insects.
02
The spray site should be accurate
Adult whitefly are clustered on the back of the leaves, with tenderness, so there are many new leaves in the upper part of the plant, while the unhatched eggs are mainly concentrated in the back of the leaves and side branches in the middle layer and above, and the eggs on the old leaves below the middle layer have hatched, so vegetable farmers should be accurate and focused when spraying.
03
The drug should be used to kill both worm eggs and eggs
When controlling drugs, we should pay attention to the selection of insect and egg killing agents, and also pay attention to alternate medication. Such as helioethyl ester (muwant), alenopherol, imidacloprid, etc., spirant ethyl ester has two-way internal absorption conductivity, can be moved upwards and downwards in the whole plant body, can protect the new stem, leaves and roots, prevent the growth of eggs and larvae of pests, but for adult insecticide killing effect is poor, so spirant ethyl ester can be mixed with alenopherol, imidacloprid, bifenthrin and other agents to enhance the insecticidal effect.
If the whitefly in the shed is serious, the vegetable farmer may wish to try the following medicinal formula, kill insects and eggs, and alternately rotate, the effect is good.
Featured Recipe 1:
10% imidacloprid microemulsion 10ml/barrel + 22.4% helioethyl ester (muwant) 10ml
Recipe 2:
2.20% furazine suspension + 5% pyridoxine aqueous agent 25ml
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