Taoyuan
Speaking of peach aphid, it seems that there is no place to respond very well. In the era when the resistance zone is particularly obvious, this is also a special case. Some places that are not difficult to fight, are also a variety of mixed or mixed, using a single imidacloprid, acetamiprid, pymetrozine, nitenpyram, etc., basically can not fight. In this case, there are both the causes of aphid resistance and some physical reasons. After careful observation, it can be seen that after the damage of the peach aphid, in addition to the honeydew residue, the leaves and the young shoots are wrapped in a layer of wire mesh. Attached on it, this is one of the reasons for the difficulty.
Two recommended formulations with good results are recommended: avermectin + nitenpyram + pymetrozine; cypermethrin + pymetrozine + imidacloprid.
Kang's whitefly
When it comes to Kang's whitefly, it is not fixedly parasitic on a particular fruit tree. It has been found on apples, pears, peaches, and even grapes. It is very harmful and can cause coal pollution and soot. And other diseases.
After killing phosphorus in the first two years, it seems that there is no good and cheap product that can prevent Kang's whitefly. In fact, before the killing of phosphorus, Kang's whitefly has shown no small resistance. Sex, the amount is also greater year by year. Subsequent replacement of chlorpyrifos is chlorpyrifos. Now it is also due to resistance problems. The dosage is gradually increased, and the effect is not as good as the effect of killing phosphorus. Moreover, the quality of chlorpyrifos in many manufacturers is worrying. After use, pear trees and other fruit trees have Falling leaves.
At present, there is no special ingredient control, and more mixed ingredients are used: chlorpyrifos, buprofezin, pyriproxyfen, fenvalerate, malathion, etc., and mixed spiropter B Ester, thiamethoxam, but really did not find out which combination is better.
Heartworm
All kinds of heartworms, peaches, peaches, apples, apples, pears, pears, etc., are actually very good prevention and control before these heartworms are drilled, and it is really difficult to control after drilling. It is not that there is no resistance before the drill collar, but the resistance is already very obvious.
Before the drill collar, the farmers always considered the cost. Basically, only the pyrethroids were used with the emamectin benzoate. After years of use, the resistance was very obvious and it was necessary to increase the dosage even in years. In this way, some farmers are thinking that they only want to use pyrethroids and do not want to use emamectin benzoate. The result is that they cannot be prevented. The overall feeling, when the first prevention, farmers have a feeling of listening to the fate of human life.
After the drill collar, the products with very poor systemicity such as emamectin benzoate and pyrethroids are of course not useful. They started to use various Kangkuan products, Zhenkangkuan and Fake Kangkuan took turns. At the beginning, the effect is really good. It is also used every year for years, otherwise it is not easy to use.
Here are 2 good single-agent products recommended: insecticidal, fipronil, although fipronil is prohibited from spraying, but after the bee has no bees, the use is harmless.
Pear and Tenebrio
When it comes to pear hibiscus, it is known to use avermectin and spirotetramat to prevent and control, saying that avermectin is resistant, basically even farmers know, but the resistance of snail ethyl ester is produced, and many people may Did not pay attention. Especially after the expiration of the patent of spirotetramat, the evolution of this resistance will accelerate, and it will be further accelerated after the legalization of the original drug is made in the next year.
Where is the resistance of spirotetramat in place? In fact, the fact that farmers accept such high-priced products of spirotetramat is largely due to its duration of validity, and the duration of more than one month. Verticillin is about 20 days old and grows a lot. Now the efficacy period of spirotetramat has been 2 to 3 days shorter than before, and it is difficult to see without special attention. Even if resistance has already appeared, it will continue to be used until the product that can replace Spider Ethyl Efficacy has been available.
Tenebrio molitor is mainly resistant to imidacloprid, and the effect of pyridoxine and thiamethoxam is good, but the relative cost of pyridoxine is relatively high, and the photolytic property of thiamethoxam is relatively high. short. Therefore, most farmers choose imidacloprid, but the concentration is increased again and the content is getting higher and higher.
Grape green scorpion
This small thing of green blind cockroaches especially likes to damage young leaves, young shoots and young fruits. The grape granules that have been smashed by it are basically abolished, so the prevention and control of the leaf-leaf stage is particularly important. In the grape area, one lap, basically the control of the green blind mites are fipronil, various fipronil microemulsions, suspension seed coating agents, all used to spray the grapes. Not malathion can also prevent it? But it can't stand the resistance. It is harmful to use the medicine. Instead, the fipronil is used up. Others are not completely unsatisfactory. Compounding is also possible, but the cost cannot be accepted, so it can only continue to make fipronil.
Mango thrips
It is said that Hainan is a problem with Hummer, but it is a difficult problem. It is not easy to use it. Even if it is not effective, the use of ethyl spinosyn is not ideal. From the beginning of the package, until now, 3 packs or more, anti- Sex increases step by step. The biggest problem currently facing is not to fight, but to maintain the effect period is too short, no matter how to use the drug, there is only a three-day period of validity. At present, there are no products with the indicated ingredients and good effects and long-lasting effects.
Moss
The resistance trend of mites has a little bit of regularity, basically from south to north, the resistance gradually decreases, and from north to south, the resistance gradually increases. For example, snail esters are very resistant in many citrus areas in the south. They are almost incapable of killing insects. Only carbazole can be used, but acetazole has been used for several years, regardless of whether it is registered or certified. Now, the effect is gradually decreasing, and many of the northern countries have not even used snail esters. Ethylazole has not even heard of it. Acetylene is known as a product that has not been resistant for 30 years. At present, it is already killing some of the harmful cockroaches. The most typical one is the greenhouse, followed by the fruit trees.
In fact, the generation of pest resistance is ultimately caused by irrational use of drugs. Look for a special drug, farmers use it hard, use it repeatedly, manufacturers overproduce, dealers recommend it, and eventually lead to resistance, it will be out of control!
Whitefly
Field hazard: whitefly is a disease of vegetables. First, due to its own secretion of honeydew, it often causes coal pollution in leaves of eggplant and other vegetables, affecting the photosynthesis of vegetable leaves, resulting in reduced yield. Second, whitefly is a sucking mouthpart Is an important medium for transmitting viral diseases.
Control plan: Most of the spray Insecticides currently used are mainly contact-killing, and a few pesticides have both fumigation and anti-feeding effects. The whitefly sucks on the leaf juice of the leaf back, which is easy to form a dead angle that cannot be touched by pesticides, especially in the case of plant growth. Moreover, when the whitefly is alarmed, it will fly to avoid, so that the contact effect of the liquid is significantly reduced. Therefore, once the whitefly bursts out, it is difficult to achieve good control effect by spraying alone. Since the growth, development and reproduction of whitefly are also closely related to temperature, it should be combined with spraying or warming or spraying.
Temperature control method: the vent can be closed to ensure that the temperature in the shed is 30~33 °C for 1~2 hours (should not be too high, the time should not be too long, otherwise it is easy to produce phytotoxicity), which can effectively improve the efficacy of pesticides. Play a better control effect.
Vegetable farmer experience:
Point application of deworming + other crops attracting + spraying control (previous period)
First, a systemic drug is used to deworm the insect before the colonization. For tomatoes, watermelons and other types of vegetables that are susceptible to viruses, pest control should start from seedling colonization. After the vegetable is planted, especially after the autumn sorghum vegetables are planted, it is the period when the smog is seriously damaged. Only when it is started before planting can it prevent the whitefly from multiplying and spreading the virus. Now, there are a lot of medicines that can be applied in the market, such as biological bacteria preparations, tablet pesticides with slow-release ingredients, etc., which can play a good deworming effect. There are no insect repellent products for special acupoints, and some vegetable farmers choose Aketai and other medicinal acupoints. At the beginning of the planting, they also played a very good effect.
Secondly, plant some "food" that the whitefly likes in order to concentrate on prevention and control. After applying the medicine in the hole, even if there is a whitefly in the shed, I don’t like to feed on the fixed vegetables. If you put some food on the column or the back wall of the shed, there is no food, no powder, and a favorite. For example, melon, tomato, cowpea, etc., can better observe the occurrence of whitefly, so as to use the drug early, control the whitefly before the outbreak.
Again, viral diseases and whiteflies are suitable for growth under neutral or alkaline conditions. The plant surface is acidic after spraying Jiameijin or vinegar, which can inhibit or kill diseases and insects that do not like acidic conditions. After planting, use Jiameijin point, spray once every 5 to 7 days, even spray 3 to 4 times, can effectively prevent viral diseases, and increase production by more than 30%. In addition, we should pay attention to supplement the micro-nutrition Jiamei dividend and profit. The research shows that the yellow virus and the fern leaf virus are closely related to the lack of elements such as iron, zinc and calcium.
Sticky board + spray (late)
When the plant is large and the potting agent is not obvious, the whitefly can have a larger space for sheltering, and the difficulty of spraying is more difficult.
Bemisia tabaci has a strong tendency to yellow, and yellow insect board can be set in the greenhouse to trap adults. Yellow plates can be purchased directly from the market or they can be made by themselves. Paint the cardboard with a yellow paint, put on a clear plastic bag, and then apply a layer of viscous oil (mix it with a small amount of oil and a little butter), and reapply the viscous oil once every 10 days. Yellow plates can trap adults, but a more important role is to provide monitoring of the occurrence of whiteflies. The organ board can be hung above the plant, and the bottom of the yellow plate is level or slightly higher than the top of the plant, 40 to 50 pieces per acre. When it is found that the whitefly is increased, it is necessary to spray the medicine in time. When spraying, it can be used with acetamiprid, matrine, flubendiamide, nitenpyram, etc., and the medicine can be rotated to avoid the rapid development of drug resistance.
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