At present, it is the rising period of pests, and if we can grasp the key point of pest outbreaks and use drugs, we can completely kill pests at once.
Otherwise, it will become a headache for a whole year, and it is difficult to beat it with more than a dozen times of medicine: for example, citrus whiteflies miss the opportunity, once the ability to fly is formed, it is very difficult to kill.
Once the mesozoan grows protective tissue (protective tissue such as wax powder), the effect of any medicine on it becomes minimal.
When the time comes, our citrus groves will become "slaughterhouses" where we can only watch the pests feasting on them, and we will not be able to do anything about it.
Adult citrus whitefly
<h1 class="pgc-h-arrow-right" data-track="5" > pay special attention to the choice and quality of medication. </h1>
From April to May, the base number of many pests rises rapidly, and with the increase of temperature, the life cycle of pests will be greatly shortened, the time from eggs to adults will be shortened, the intergenerational frequency of pests will increase, and eggs and larvae and adults exist at the same time, resulting in increased difficulty in control. The originally well-applied medicine will also greatly reduce the effect, resulting in an increase in the difficulty of prevention and treatment.
Therefore, it is important to grasp the critical period of pests in April, and the choice and timing of medication are particularly important. For two types of insect pests that are prone to outbreaks from April to May--- citrus whitefly and ticks, we talk about how to seize the opportunity and choose medication.
Insect pests
<h1 class="pgc-h-arrow-right" data-track="5" > the critical period of feathering of citrus whitefly is also the best control period</h1>
Citrus whiteflies prefer dark and wet environments, and if the garden is not properly pruned, the canopy is closed or continuous rain is prone to whitefly hazards. Since the beginning of April this year, there has been a lot of rainy weather, so it should be observed to avoid outbreaks of this insect.
Mainly harmful to new leaves, in Gannan and other citrus producing areas of the spring shoots of the harm is lighter, often endanger the summer shoots, or fruits, resulting in the occurrence of soot disease, covering the leaves caused by photosynthetic efficiency greatly reduced, covering the fruit so that the appearance quality is greatly reduced.
Whitefly are prone to complications of soot disease
Once the outbreak of citrus whitefly, adult insects occur in large numbers, and it is difficult to control, because of its migratory characteristics, the effect of touch-killing pesticides is limited.
From the end of April to the beginning of May, it is just the key period of citrus whitefed, the first generation of larvae begin to feather, at this time spraying is easier to completely kill, once the feathering is successful, the prevention and control of whitefly throughout the year, so the control of whitefly should be emphasized at the end of April.
<h1 class="pgc-h-arrow-right" data-track="5" > the best control period for ticks</h1>
At this time, the insects have not yet formed a surface layer of wax or powder. The insects move slowly and are easier to kill, but in the later stages of development, wax and powder will be produced on the outside, which can play a good protective effect on the insect body and reduce the killing effect of pesticides.
Therefore, the best time to control insect shell insects is also at the end of April.
Brown roundworm shell insect hazards
<h1 class="pgc-h-arrow-right" data-track="5" > citrus whitefly and mesosome medication regimens</h1>
Through the application practice, orange growers have found that thiazide ketone has the best effect on citrus whiteflies, especially at the end of April, which can almost achieve the effect of one tube for one year at a time.
Thiazide ketone is used less daily, many growers may not know too much, let's briefly introduce:
Thiazide ketamine, also known as chlorpyrifos, has a good control effect on larvae such as whiteflies, ticks, leafhoppers, etc., but the lethality of adults is very weak, so the medication time node is very critical, and the effect is obvious in the high incidence of larvae. Combined with organophosphorus pesticides, the killing effect of adult insects can be increased.
Thiazide has a strong touch-killing effect and has a gastric toxic effect. After the pest larvae are drugged or eaten, the epidermal chitin synthesis is blocked, and it is impossible to molt smoothly, eventually causing the larvae to deform or die.
The pesticide was applied in April, and the control effect on whiteflies and ticks is very good, because it is in the larval stage, but at the same time there are two deficiencies, one is slow to see the effect, and the other is poor on adult insects, so it is necessary to compound quick-acting pesticides, such as triazoliphos, chlorpyrifos and so on.
Another notice: During the headline "Knowledge Festival", purchase the column and enjoy a 50% discount.
Whitefly larvae infected with the whitefly constellation crustaceans