How to use pesticides correctly in greenhouse vegetables
Category: Pesticides and Fertilizers
Content: In recent years, greenhouse vegetable cultivation is very common. Due to the special ecological environment in the vegetable shed, it is suitable for all kinds of pests and diseases throughout the year. To effectively control pests and diseases and cultivate high quality and safe vegetables, pesticides must be used scientifically and correctly.
Choose the right medicine. Each pesticide has a certain range of control and control targets. Therefore, before use, it is necessary to understand the performance and use of each pesticide, according to the characteristics of the pests in the shed and the correct selection of drugs, to achieve a targeted.
Timely medication should be applied in the early stage of pests and diseases according to the law of occurrence of pests and diseases. Taking into account the warm and humid environment in the shed, it is not advisable to spray on rainy days or high temperatures to prevent excessive humidity in the shed and reduce the efficacy. At the same time, do not use sulfur preparations to control melon and vegetable diseases under high temperature conditions to avoid phytotoxicity.
Rotational drugs should be used interchangeably according to different types and different mechanisms of action. For example, omethoate belongs to organophosphorus pesticides, and enemy killers belong to pyrethroid pesticides. Their mechanism of action is different. If attention is paid to rotation, the occurrence of pest and disease resistance can be avoided or delayed.
Safe use of drugs in the production of vegetables should use high-efficiency, low-toxic, low-residue pesticide varieties, should not increase the concentration of liquids at random, the number of medications can not be too much, strictly according to the interval medication, to prevent vegetable phytotoxicity. At the same time, the use of highly toxic pesticides such as organochlorine, carbofuran and methamidophos should be strictly prohibited.
How to identify the failure of pesticides When purchasing or using chemical pesticides, it is necessary to identify the quality of pesticides. If you purchase or use pesticides that have already expired, it will not only directly cause economic losses, but also easily cause phytotoxicity, and also cause pests and diseases. Reduced production due to lack of timely and effective control.
Commonly used authentication methods are:
Intuitive method for powder pesticides, first look at the appearance of the drug, if it has been obviously wetted by agglomeration, the drug taste is not strong or have other odors, and can be smashed into a group by hand, indicating that it has basically failed; for the emulsion pesticide, the bottle is first allowed to stand, If the liquid is turbid or stratified (ie, oil-water separation), there is sediment formation or flocculation, indicating that the agent may have failed.
The heating method is suitable for powder pesticides. Take 5-10 grams of pesticides and heat them on a piece of metal. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good. Otherwise, it means that it has failed.
The floatation method is suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water surface to observe carefully, wet in 1 minute and can sink to the water is the non-failed pesticide, otherwise it is a failed pesticide.
The suspension method is suitable for wettable powder pesticides. Take 30-50 grams of pesticides, put them in a glass container, add a small amount of water to make a paste, then add 150-200 grams, stir well with water, and let stand for 10 minutes to observe. The pesticides that have not failed are well soluble. The suspended particles in the medium are fine, the sedimentation rate is slow and the amount of sedimentation is small, and the pesticide is reversed.
The oscillating method is applicable to emulsion pesticides. For pesticides with oily water layer, first shake the vial with force and let it stand for 1 hour. If stratification still occurs, the agent has deteriorated.
The hot melt method is suitable for emulsion pesticides. Put the pesticide with the precipitate into the warm water (the water temperature should not be too high, preferably 50 ° C -60 ° C), after 1 hour, if the sediment slowly dissolves, the agent has not expired, and the precipitate is dissolved. After that, it can continue to be used; if the precipitate is difficult to dissolve or dissolve, it means that it has failed and can no longer be used.
The dilution method is applicable to emulsion pesticides. Take 50 grams of pesticide, put it in a glass bottle, add 150 grams of water, and shake it vigorously for 30 minutes. If the liquid is evenly milky white, it will be a failed pesticide, and the more the upper layer of oil, the worse the drug.
Excerpted from: Farmers Daily
Category: Pesticides and Fertilizers
Content: In recent years, greenhouse vegetable cultivation is very common. Due to the special ecological environment in the vegetable shed, it is suitable for all kinds of pests and diseases throughout the year. To effectively control pests and diseases and cultivate high quality and safe vegetables, pesticides must be used scientifically and correctly.
Choose the right medicine. Each pesticide has a certain range of control and control targets. Therefore, before use, it is necessary to understand the performance and use of each pesticide, according to the characteristics of the pests in the shed and the correct selection of drugs, to achieve a targeted.
Timely medication should be applied in the early stage of pests and diseases according to the law of occurrence of pests and diseases. Taking into account the warm and humid environment in the shed, it is not advisable to spray on rainy days or high temperatures to prevent excessive humidity in the shed and reduce the efficacy. At the same time, do not use sulfur preparations to control melon and vegetable diseases under high temperature conditions to avoid phytotoxicity.
Rotational drugs should be used interchangeably according to different types and different mechanisms of action. For example, omethoate belongs to organophosphorus pesticides, and enemy killers belong to pyrethroid pesticides. Their mechanism of action is different. If attention is paid to rotation, the occurrence of pest and disease resistance can be avoided or delayed.
Safe use of drugs in the production of vegetables should use high-efficiency, low-toxic, low-residue pesticide varieties, should not increase the concentration of liquids at random, the number of medications can not be too much, strictly according to the interval medication, to prevent vegetable phytotoxicity. At the same time, the use of highly toxic pesticides such as organochlorine, carbofuran and methamidophos should be strictly prohibited.
How to identify the failure of pesticides When purchasing or using chemical pesticides, it is necessary to identify the quality of pesticides. If you purchase or use pesticides that have already expired, it will not only directly cause economic losses, but also easily cause phytotoxicity, and also cause pests and diseases. Reduced production due to lack of timely and effective control.
Commonly used authentication methods are:
Intuitive method for powder pesticides, first look at the appearance of the drug, if it has been obviously wetted by agglomeration, the drug taste is not strong or have other odors, and can be smashed into a group by hand, indicating that it has basically failed; for the emulsion pesticide, the bottle is first allowed to stand, If the liquid is turbid or stratified (ie, oil-water separation), there is sediment formation or flocculation, indicating that the agent may have failed.
The heating method is suitable for powder pesticides. Take 5-10 grams of pesticides and heat them on a piece of metal. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good. Otherwise, it means that it has failed.
The floatation method is suitable for wettable powder pesticides. First take 200 grams of water, then weigh 1 gram of pesticide, gently and evenly spread on the water surface to observe carefully, wet in 1 minute and can sink to the water is the non-failed pesticide, otherwise it is a failed pesticide.
The suspension method is suitable for wettable powder pesticides. Take 30-50 grams of pesticides, put them in a glass container, add a small amount of water to make a paste, then add 150-200 grams, stir well with water, and let stand for 10 minutes to observe. The pesticides that have not failed are well soluble. The suspended particles in the medium are fine, the sedimentation rate is slow and the amount of sedimentation is small, and the pesticide is reversed.
The oscillating method is applicable to emulsion pesticides. For pesticides with oily water layer, first shake the vial with force and let it stand for 1 hour. If stratification still occurs, the agent has deteriorated.
The hot melt method is suitable for emulsion pesticides. Put the pesticide with the precipitate into the warm water (the water temperature should not be too high, preferably 50 ° C -60 ° C), after 1 hour, if the sediment slowly dissolves, the agent has not expired, and the precipitate is dissolved. After that, it can continue to be used; if the precipitate is difficult to dissolve or dissolve, it means that it has failed and can no longer be used.
The dilution method is applicable to emulsion pesticides. Take 50 grams of pesticide, put it in a glass bottle, add 150 grams of water, and shake it vigorously for 30 minutes. If the liquid is evenly milky white, it will be a failed pesticide, and the more the upper layer of oil, the worse the drug.
Excerpted from: Farmers Daily
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