There are two situations in which the spraying time is not good enough to catch the best prevention and treatment period. First, the medicine is not timely, no pests and diseases are not used, and a large number of pests and diseases are seen, and the best time for spraying is delayed. Medication, but the effect is very small; the other situation is not to use the drug according to the indicator, see the worm to cure, during the growth of the crop, at any time, a small number of lesions or pests, see the worm to cure, see the disease to prevent, insects and insects Playing insurance drugs, rest assured drugs, wasting talent and financial resources.
Poor spray quality is difficult to fight drugs, save trouble, the liquid cloth is not in place, uneven, the plant inside the sputum, the back of the leaf often does not take the drug, and some randomly increase the diameter of the sprayer, even remove the piece, so that the drug is sprayed The liquid does not uniformly contact the worm body, so it is difficult to obtain a better control effect.
Do not look at the weather, time, random medication regardless of high temperature, high humidity, wind and other weather, free to fight drugs, resulting in poor control, and even phytotoxicity or personnel poisoning.
Pests have the first resistance to drugs, and the variety of drugs is single. It is found that a certain pesticide has good effects and is used for a long time, so that the pests quickly develop resistance. Secondly, the concentration and dosage of the drugs are increased at will, and many people think that after using a certain drug, 2 When the insects die in 3 minutes, the drug or concentration is considered to be effective, otherwise the dosage is increased, and as a result, the pests quickly develop resistance.
Improper compounding of drugs The characteristics and functions of pesticides are not known, blindly mixed, resulting in reduced efficacy or phytotoxicity.
Neglecting the biological control effect Spraying does not pay attention to protect natural enemies, and is accustomed to using a wide spectrum of highly toxic pesticides such as parathion, resulting in a large number of killing natural enemies. Despite frequent use of drugs, the effect is not good, and the pests are more embarrassing.
Identify the target of prevention and treatment, and choose the right medicine. To solve the problem, the first thing to understand is whether the disease or pest is in the field. What kind of pests and diseases are involved? At the same time, it is necessary to understand the characteristics of pesticides, the objects to be controlled, the methods of use and precautions, according to the different types and occurrences of pests and diseases. At the developmental stage, the corresponding pesticide type, dosage form and concentration are selected to achieve the right medicine.
Doing a good job of forecasting and forecasting and timely forecasting of drugs is the basis of pest control. In practice, we should pay attention to the detailed investigation and forecasting, to understand the dynamics and laws of pests and diseases, and to understand the various factors affecting their development. When it is really needed, it should be carried out. At the same time, it should be considered when the application should be the weak link of the life history of the pests and the damages, such as the younger stage before the third insult of the pests and the small amount of insects. It is the best period of prevention and control, and the prevention and treatment of diseases is carried out before the pre-primary dyeing or the epidemiological center has not spread.
Improve the quality of spraying According to the different parts of the pests inhabiting the plants, different application methods or instruments are used. For example, the hawthorn leaves are harmful on the back of the fruit leaves, and there are more cockroaches in the previous period. Therefore, it is necessary to master the "snoring and snoring, winding around the tree, and smashing the inner shackles". According to the order of "first down, then up, first inside and outside", the whole tree is sprayed evenly and thoughtfully, and the worms are evenly distributed. In addition, when spraying, it must be noted that the pressure of the spray is large and the spread on the plant is good.
Choose the weather and time. Pay attention to the weather changes. Try to arrange it on a good day. Do not fight when it is raining or raining, so as not to affect the efficacy.
Avoid pests to develop resistance. Rotate the use of water and the mechanism of action and control agent. Tests have shown that the use of high-concentration agents produces faster drug resistance than low-concentration agents, so it is important to avoid increasing the amount of drug during use.
Scientific mixed pesticides After the pesticides are mixed, there should be no physical or chemical adverse reactions, such as reduced drug efficacy after mixing, increased toxicity or precipitation of humans and animals. Alkaline pesticides and acidic pesticides should not be mixed. Microbial pesticides should not be mixed with slightly acidic pesticides. When mixed, copper sulfide precipitates. When dissolved, excessive copper ions will cause phytotoxicity to crops, so it is not easy to mix.
Protecting and Utilizing Natural Enemies When there are fewer pests and more natural enemies, there is no need to spray drugs, and there are more pests. If it is not sprayable, use pesticides that have little effect on natural enemies with high efficiency and low toxicity.
Problems and countermeasures in the role of pesticides
The target of prevention and treatment is not clear. In the growing season of crops, several pests and diseases are often occurred at the same time. The pesticides are abused without understanding the biology and living habits of various pests and diseases, such as using pyrethroids to control red spiders and even using insecticides to control diseases.
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