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2, improper application of pesticides. The occurrence, damage, and habitat of field pests and diseases have a hazardous location on crops. This particular site is the target of pesticides and arrows that we should hit. If the target is not fired, the pesticide control effect will be poor. Such as the control of aphids to be sprayed on the heart and leaves, control of rice leaf spray, control of rice planthoppers and sheath blight must be sprayed on the lower part of the rice plant, rice leaf roller, rice leaf blast, bacterial blight, etc. Spray the top leaf.
3, pest resistance continues to increase. The resistance of pathogens and insect pests to pesticides is a practical issue that hinders pesticides from fully exerting proper control and potential efficacy. With the rapid increase in the amount of pesticides and the continuous replacement of varieties, the resistance of pests and diseases has become increasingly acute. In particular, food, oil, vegetables, tea, fruit and other major crops, the types of major pests and diseases that are frequently used, are more or less dozens of times more resistant to insecticides.
4, do not understand technology, the object of prevention is not clear. Disease when the insects fight, insects when the disease kills, grass do insects, this is the first diagnostic error, unclear identification, leading to wrong medication, poor control or even produce phytotoxicity. For example, after the occurrence of red bud disease, the veins turn green, the leaves become purple, and the liver is plentiful. The leaves are rolled downwards and finally the scorch falls off. People easily mistakenly believe that it is a red spider; the weeds in the soybean field harm the soybeans and cause soybean damage. Growth is stagnant, stunted, mistakenly treated as root-knot nematode disease, etc. Of course, the more severe the more the rule.
5, spraying liquid waste. At present, spray equipment commonly used in rural China is still a consistent system of workers and peasants – 16 spray methods for decades. It is labor-intensive, wasteful, prone to poisoning, unsafe, coarse-grained fog, and poor control effectiveness. According to the measurement, this spray method has poor adhesiveness and low deposition rate. 70%-90% of the liquid is wasted, dripping in the soil, losing in the water, and seriously polluting the environment. Therefore, new tools and technologies such as low-volume spray, ultra-low spray, mist, and electrostatic spray should be actively promoted. This is an effective way to reduce waste due to poor control.
6, the limitations of pesticide control effect. Some pesticides have good control effects against certain pests, but they are powerless against other pests and have extremely poor control. Triazophos, for example, is effective against rice blast, cotton bollworm, and other lepidopteran pests, and has a significant ovicidal effect on these pests. However, it can stimulate the spawning of rice planthoppers and cause the relocation of rice planthoppers. Oh, wait. `
7, the application time is not good. Live branches of insects are governed by the law of day and night, and they also have their own "biological clock." Such as cabbage butterfly (Phyllostachys edulis), cotton leaf roller moth, rice bran, etc. all like to light in the daytime activities, and lepidoptera and some codling moth pests, are active at night, mating, spawning harm to animals. Therefore, we should master the law of pest activity, in the day, at different times, targeted "dosage on time," in order to achieve the best results.
8. Constraints on weather conditions. Different meteorological conditions are closely related to the control effect of pesticides. Different temperatures, humidity, light, wind, and sun and sunshine have influences on the occurrence and activity of pests and their control effects. If the temperature is below 8°C, the herbicide will not be able to exert its efficacy; at temperatures above 35°C and with strong light, chemical pesticides will easily evaporate and disappear; the windy liquid will drift and blow away, which will also affect the effectiveness of control. The use of EC pesticides requires no rain within 24 hours of spraying; no contact with rain is required within 48 hours of the use of contact pesticides.
9, the reduction of natural enemies. Due to the heavy use of highly toxic and high-residue pesticides in successive years, the natural enemies of pests are greatly killed and the ecological balance is destroyed, causing pests to relapse again, creating a vicious circle.
10, the reason for the quality of medicine. Water is divided into hard water and soft water. Well water, mining area water, and some mountainous springs are mostly hard water. Diluting the effects of pesticides is poor. Because of the contained minerals, they will decompose the active ingredients of pesticides; while the pond water, river water, and stream water are mostly soft water with low mineral content. Dilution of pesticides is effective. However, these pond waters and river waters are very turbid and will also affect the efficacy of the drug.
Ten Reasons for Poor Efficacy
1, the timing of drug use is not accurate. We must seize the opportunity to fight drugs, only to understand the laws of the pests and diseases, timely medication, can be effective. For example, aphids must be administered at the time of egg hatching. If wait until the ants have invaded the stems, dry heart, white ear, dead ear and so on will appear. It is certain that the control effect is poor.