The current control of crop pests and diseases is still based on spraying pesticides. However, in the production practice, it is often encountered that the application of qualified pesticides is not satisfactory. The reason is as follows:
One reason: medicine is not correct
One is treating the disease as an insect, treating the insect as a disease, and using medication errors. If the dead seedlings caused by tomato bacterial wilt are misdiagnosed as dead seedlings caused by the bite of underground pests, the use of medicines will not be effective.
The second is that although the diagnosis is correct, medication is not symptomatic. If Jinggangmycin is used to control rice blast, the use of dicofol to control the three wheat aphids, and the use of insecticides to control rice planthoppers have no effect.
Reason two: missed opportunity
The prevention of insect pests is best when the adult egg laying peaks or before the larvae are newly hatched until the third instar. If the larvae are older than 3 years old, the application of pesticides will not be effective.
Reason 3: The amount of medicine is not allowed
Excessive drug use is prone to phytotoxicity, and the use of drugs is too small to achieve the purpose of pest control. Therefore, it must be formulated according to pesticide application instructions before satisfactory control effects can be obtained.
Reason 4: Improper mixing
For example, dimethoate, phoxim, dichlormic and other weakly acidic or neutral pesticides are mixed with alkaline pesticides such as lime sulfur, which will cause the decomposition of pesticides to fail; the use of alkaline pesticide lime sulfur mixed with Bordeaux mixture will produce Excess soluble copper, causing phytotoxicity.
Reason 5: Blindly spraying medicine
The spraying will be sprayed on the vital part, will receive the ideal result. Such as the prevention and treatment of Sclerotinia sclerotiorum, it should be based on the rules of sclerotia in the soil in winter, before the sclerotia germination in the field to sprinkle medicine, control effect is good, if the drug spray on the site of the disease, the effect is not good. Rice Blast, Bacterial Leaf Blight, etc. mainly occur on the leaves. When spraying, it is necessary to spray on the foliage. To prevent and control the cotton spider mites, spray the medicine on the back of the leaves to receive good control.
Reason six: bad weather
The efficacy is closely related to meteorological factors such as temperature, humidity, rain, dew, wind and light. If emulsion pesticides are applied, no rain will be available for at least the next 24 hours after spraying. The use of stomach poisons and contact pesticides requires no rain for at least two days in order to achieve good efficacy. Therefore, according to the local weather forecast, choose sunny weather spray.
Reason 7: Poor quality of medical equipment
The goodness and badness of the efficacy are also related to the spraying tools used. The quality of the spraying tools is not only effective but also less laborious and can improve the efficacy.
Guangdong Jia Mei Biological Technology Co.Ltd , https://www.jaymeimask.com