4. Miss the best time of medication, apply medicines according to disease, emphasize treatment and light prevention


For the prevention and control of crop diseases, the common practice of many farmers is to "apply medicine to see the disease, pay more attention to the control than to prevent it". Some farmers said that in order to cure epidemic diseases, there are many "special effects" of the single agent of allyl morpholine, metalaxyl and cyanuride, and these pesticides are used to prevent and control diseases before they occur, and the above varieties are added to each medication. This kind of "active attack" disease prevention and control method is widespread in many places.


Once the efficacy is found to be reduced, the dosage will be increased and a single drug will be used for a long time, which will inevitably lead to premature bacterial resistance, and there will be no remedy for the outbreak of the disease. We should change the existing concept of prevention and control, adhere to the principle of "prevention first, comprehensive prevention", scientifically select pesticide varieties, avoid the mixing of many preparations with the same active ingredient, and suggest that different ingredients should be used alternately and mixed with protective agents to delay the occurrence of resistance.


5. Misconceptions in Pesticide Mixture


At present, farmers hope that all pests and diseases will be solved by one-time medication. There are many problems in the compounding of pesticides of different types and dosage forms.


(1) There are misunderstandings in secondary dilution


The correct way is to dilute several pesticides to be diluted, then pour them into the sprayer and dilute the next one in order, so as to truly play the role of the two dilution in improving the efficacy.


(2) The order of dosage forms in mixing affects the exertion of pharmacodynamics.


Foliar fertilizer, wettable powder, water dispersible granule, suspension agent, microemulsion, water emulsion, water agent and emulsifiable oil were used as fertilizers and foliar fertilizer in turn, so the stability of the mixture was better.


(3) The acidity and alkalinity of medicines affect the exertion of their efficacy.


It is easy to neutralize acid and alkali when mixing improperly. For example, copper preparations, which account for a large proportion of bacterial diseases, are liable to discoloration and precipitation when mixed with other medicines, and the efficacy of light medicines will be weakened, while that of heavy medicines will be harmful.


6. Temperature and Humidity Affect the Effectiveness of Drugs


Humidity and temperature will affect the effectiveness of the drug, such as spraying when the dew is not dry, the dew will dilute the concentration of the drug solution. Too high or too low temperature will affect the efficacy of drugs. Generally speaking, the temperature in the range of 20 30 is better.


It is unreasonable to expect "special effect drugs" blindly, and "magic medicine" from "medicine to disease" is also not available. In order to improve the efficacy of drugs, we need to start from the above points to find the factors that limit the improvement of the efficacy. Only by eliminating the unfavorable factors as far as possible, can the efficacy of pesticides be better brought into play.


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