1. [The object of prevention and control is not clear] In the crop growth period, several pests and diseases are often occurred at the same time. The biological and living habits of various pests and diseases are not known, and biological pesticides are abused, such as using pyrethroids to control red spiders, and even killing insects. Agent to prevent disease.
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.
2, [poor quality of spraying] Difficult to fight when fighting drugs, save trouble, the liquid cloth is not in place, uneven, the inside of the plant, the back of the leaf often do not take medicine, and some randomly increase the diameter of the sprayer, even remove the piece, so that The sprayed liquid does not uniformly contact the insect body, so that 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.
3, [Pest resistance development] First, the drug variety is single, found that a certain pesticide effect is good for long-term use, so that pests quickly develop resistance; Second, increase the concentration and dosage of drugs at random, many people think that a drug It is considered that the drug or concentration is effective after seeing the insects within 2-3 minutes after use. Otherwise, the dosage is increased, and as a result, the pests quickly develop resistance.
4, [inappropriate drug mix] Unclear the characteristics and functions of biological pesticides , 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.
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Thickness range: 0.15mm - 0.35mm;
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