The timing of medication is not accurate
Spraying must seize the opportunity, only to understand the occurrence of diseases, insects and weeds, timely medication, can be effective. For example, to treat borers, it must be used during the peak period of egg incubation. If you wait until the ant borer has penetrated into the stalk and there are dry hearts, white ears, dead ears and other phenomena before using medicine, the control effect is definitely not good.
Improper application methods
The occurrence of field diseases, insects and weeds and the inhabitation of pests have a pest site on the crop. This specific part is the "target" that the "arrow" of the pesticide we use should be hit, and if it misses the target, the pesticide control effect will be poor. For example, the control of borer can only be achieved by spraying on the heart leaves of rice.
Increased resistance to Cordyceps
The resistance of pathogens, pests and weeds to pesticides is a practical problem that hinders pesticides from giving full play to their due control effects and potential effects. With the rapid increase in the amount of pesticides and the continuous replacement of varieties, the resistance of Cordyceps is also intensifying, especially for major crops such as grain, oil, vegetables, tea, fruits, etc., the use of drugs is frequent, and the resistance of Cordyceps is several times or dozens of times.
The target of prevention and control is not clear
When the disease is beaten by insects, insects are killed by disease, and grass is used to eliminate insects, this phenomenon is widespread. First of all, this is a diagnostic error, which is not clear and leads to the wrong medication. For example, the red leaf blight that occurs after the cotton buds, the leaf veins turn green, the mesophyll is purple and red and pork liver colored, the leaves roll downward, and finally scorch and fall off, which is often mistaken for red spiders. The soybean field weeds and dodder are harmed, resulting in stagnation of soybean growth and stunted growth, and some people often treat it as root-knot nematode disease, etc., of course, the more it is treated, the more serious it is.
Spraying liquid is wasteful
At present, the spraying equipment commonly used in rural areas of the mainland is still a worker-agricultural sprayer that has been consistent for decades, which is labor-intensive, wasteful, easy to poison, unsafe, coarse fog particles, and poor control effect. According to the measurement, this spray method, poor adhesion, low sedimentation rate, the liquid medicine is not only wasted, but also the liquid dripping in the soil, lost in the water, but also seriously polluted the environment. Therefore, we should actively promote new machinery and technologies such as low-volume spraying, ultra-low-volume spraying, mist and electrostatic spraying, which is an effective way to solve the poor control effect and reduce pesticide waste.
Limitations of pesticides themselves
Some pesticides have a good control effect on some diseases, insects and weeds, but they are powerless against other diseases, insects and weeds, and the control effect is extremely poor. For example, triazophos has a good control effect on rice borer, cotton bollworm and other lepidopteran pests, and has obvious eggicidal effect. However, it can stimulate rice planthoppers to lay eggs, causing rice planthoppers to become rampant again.
The application time is not well grasped
The occurrence of diseases, insects and weeds has certain laws and has its own biological clock. For example, cabbage butterflies, cabbage worm adults, cotton leaf moths, rice locusts, etc. all like to be active in the daytime with sufficient sunlight, while lepidopteran armyworms and some moth insect pests are active, mating, and laying eggs at night. Therefore, only by mastering the activity rules of pests and "taking medicine on time" at different times of the day can the best control effect be achieved.
The reasons for the poor effect of pesticide application are introduced here, and I hope it will be helpful to everyone. If you want to buy high-quality and high-yield vegetable seeds, you can download the seed bank App, and the country's excellent vegetable varieties are available for everyone to choose.
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