Pyriproxyfen is an effective agent that has emerged in scale insect control in recent years, and its cost is relatively low. In recent years, it has been promoted and used in some areas. After testing on a variety of crops, pyriproxyfen products not only have good effects on pests such as scale insects, pear psyllids, and whiteflies, but are also effective on the eggs of most pests and are safe for fruit trees. .
The current situation of scale insect control
In order to prevent and control scale insects, fruit farmers spend a lot of energy every year . In the past, the most popular insecticide we used was methotrexate. This drug is really effective in controlling scale insects, but it is now banned. At present, for the prevention and control of scale insects, chlorpyrifos, spirotetramat, sulfoxaflor and other ingredients are commonly used. However, chlorpyrifos has also been banned in some places, and spirotetramat and sulfoxaflor are not only high in cost but also difficult to use. It takes a long time, and the resistance to scale insects is serious, and the effect is mediocre.
Pyriproxyfen and its control advantages
Pyriproxyfen is a low-toxicity insecticide and a growth regulator of benzene ether insects, while DuPont titanium dioxide is a juvenile hormone analogue. New pesticides. Pyriproxyfen is an inhibitor of chitin synthesis in insects and can effectively prevent the molting process of insects. Its mechanism of action is to inhibit the activity of the pharyngeal body of insects and interfere with the biosynthesis of ecdysone. In addition, pyriproxyfen can also inhibit the hatching of eggs, preventing females from laying eggs. In this regard, it is an oviicide that is a UV adhesion promoter. According to relevant data, pyriproxyfen is effective against the eggs of almost all pests except mite eggs.
Pyriproxyfen can effectively inhibit the developmental metamorphosis, pupation, emergence and adult formation of pests. It has the effect of killing eggs and larvae of lepidopteran pests. It has good ovicide effect on psyllids, whiteflies, scale insects and other sucking and rasp-sucking mouthparts pests and most other pests. It can also inhibit mosquitoes, The pupation and emergence of fly larvae is a good hygienic insecticide.
When pyriproxyfen was first promoted, although it was effective against scale insects, its effect was slow, and the advantages of pyriproxyfen were too obvious, so this ingredient has always played the role of ovicide. . When pyriproxyfen was banned, the advantages of pyriproxyfen were finally revealed.
Pyriproxyfen has four major advantages
First of all, it has a broad spectrum of prevention and treatment. It is effective against thrips, aphids, whiteflies, scale insects, etc. It can control multiple pests at the same time with one application. When growers use pyriproxyfen to control scale insects, it can not only prevent and control scale insects, but also kill many insect eggs. Aphids, psyllids, leaf miners and other pests often occur on fruit trees, and pyriproxyfen has no effect on their eggs. All have killing effects. By spraying pyriproxyfen, the number of other pests in the orchard will also be significantly reduced in the later period.
Secondly, pyriproxyfen has high egg-killing activity. Ideally, a concentration of one part per million can effectively kill eggs, and pyriproxyfen can kill eggs efficiently. After the eggs are exposed to adult insects, the adults will not lay eggs or the eggs they lay cannot hatch, so use In orchards treated with pyriproxyfen, the incidence of pests is very small.
Once again, pyriproxyfen has a long-lasting effect in controlling scale insects. After spraying pyriproxyfen, the pests will die completely in 7 to 10 days. If pyriproxyfen is used scientifically, there will be no more pests in a season.
Finally, it is very practical. The mixability is very good and can be mixed with most pesticide products; the cost is not high. Generally, when used at 1500 to 2000 times, the cost of 30 kilograms of water is about 2 yuan.
The difference between pyriproxyfen and other ovicides
Ordinary ovicicides have strict application time requirements. They must be used to kill eggs during the egg-laying period of pests (contact egg-killing). When used during the egg-laying period, the liquid must be sprayed on the eggs to be effective. If the egg mass is not fully exposed to the liquid, it will not work. The eggs will not be completely killed, and it is also effective against pests with overlapping generations, such as citrus psyllids and scale insects. , mealybugs, etc. are not effective. However, pyriproxyfen can kill eggs during the spawning period and also during the egg-laying period, especially for pests with overlapping generations. Therefore, it is widely used in the control of whiteflies and scale insects on fruits, vegetables, cotton and ornamental plants, as well as mosquito and fly control and animal health in public health.
The application technology of pyriproxyfen in scale insect control
Pyriproxyfen has been promoted well in southern fruit tree areas in recent years. It can not only control psyllids and other pests, but also scale insects. Special effect, one-time use of medicine solves many problems for growers, and is highly practical. The specific measures to prevent and control scale insects are as follows:
1. The disadvantage of using pyriproxyfen alone is that it has a slow effect. Generally, 100g/liter pyriproxyfen EC is sprayed 1500 times, and the scale insects will be treated 10 to 15 days after application. Only then can they all die.
2. If you use pyriproxyfen with other ingredients, the quick effect will be better. For example, use 100 g/L pyriproxyfen 2000 times solution with 50% chlorpyrifos 1500 times solution, 70% thiamethoxam 2500 times solution, 20% acetamiprid 2000 times solution, etc. Scale insects can be seen about five days after application. Deaths began to appear in significant numbers.
3. Use some compound preparations of pyriproxyfen, such as 10% imidacloprid and pyriproxyfen suspension, 20% emamectin and pyriproxyfen suspension, and 10% beta-cypermethrin and pyriproxyfen. Propyl ether microemulsion, etc., no longer need to be compounded, and the control spectrum is wider.
