1.Don't blindly pursue new pesticides
In production, due to the long planting time of greenhouse vegetables, pests and diseases are often increased and disease resistance is becoming stronger. Many vegetable farmers mistakenly believe that the effect of old pesticides in the past is not as good as before. Under this kind of thinking, it is new. Pesticide favors, listen to the business to promote new drugs, do not ask the pharmacological characteristics of the new drug, the price, blindly buy.
In fact, although new pesticides have their own advantages, they are not omnipotent and cannot completely replace previous pesticides. Because the new pesticides have just been put into production, the pests and diseases have not been resistant to them, and the dosage of using is small and the effect would be prominent. Compared with the traditional pesticides, new pesticides have great advantages. For example, fluopicolide compounded with propamocab hydrochloride has a good effect on downy mildew of cucumber, and difenoconazole formulated with azoxystrobin is very effective in controlling tomato leaf mold.
2.Pesticide should be used together
When tomato has a late blight, it is sprayed with propamocarb or metalaxyl. When an early blight occurs, it sprays senomomanganese or anti-drug, and when a bacterial disease occurs, it sprays copper. The result is that it controls one problem and others are ignored. The reason is that the single pesticide is not conducive to the comprehensive control of multiple diseases.
The use of scientific and rational pesticides can expand the scope of use or treat several harmful organisms, and even increase the efficacy and reduce the side effects of pesticides such as resistance and phytotoxicity, which is efficient, labor-saving and time-saving. Such as copper oxyride can be mixed with many fungicides and insecticides, mixed with 30% suspension 600 times solution and 70% thiophanate 800 times solution to control bacterial leaf blight of vegetable brown spot, anthracnose, bacterial angular spot disease and other diseases, mixed with kasugamycin to prevent a tomato bacterial disease and fungal disease.
3. The concentration of azole-containing pesticides should not be too high
There are many fungicides containing azoles, among which the components of Fuqing are fluconazole, the components of Fuxing are flusilazole, the components of Shigao are difenoconazole, and the components of Xiansheng are components of myclobutanil and diniconazole. The component of tepazole and dichlorvos is propiconazole. The instructions for these fungicides say how good the effects of controlling powdery mildew, leaf mold and rust are, but there is no side effect of excessive dosage.
Therefore, when using this kind of pesticide, it must be used strictly according to the specified amount. Otherwise, if the concentration is too high, the top leaves of the plant will become smaller, thicker and shrink, and the most obvious is that the internode becomes shorter, such as on the cucumber. Special attention should be paid when using.
4. Abamectin can not be applied by water rushing
Abamectin is a highly effective, low-toxic, safe, insect-resistant insecticide with a strong killing effect on most nematodes, ectoparasites and other arthropods. Some vegetable farmers in the prevention and control of root-knot nematode disease, the drug is applied with water, the results naturally fail to prevent and control.
The application of abamectin at 1500-2500 times can only guarantee its effect. That is to say, it takes about 0.5 kg of abamectin to be applied to 1000L water. The abamectin about 10kg can come into play, such a large amount is impossible to achieve.