In recent years, greenhouse vegetable cultivation is very common. Because the ecological environment in the vegetable shed is relatively special, all kinds of pests and diseases are suitable throughout the year. To effectively control pests and diseases and produce vegetables that produce high quality and safety, it is necessary to use pesticides scientifically and accurately. Accurate drug selection. Each pesticide has a certain range of control and control targets. Therefore, it is necessary to understand the function and use method of each pesticide before use, and to accurately select the medicine according to the characteristics and objects of the pests in the shed, so as to be 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 the wetness in the shed and to reduce the efficacy. At the same time, do not use sulfur preparations to prevent melons and vegetable diseases under high temperature conditions, so as 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 you pay attention to rotation, you can avoid or delay the development of pest and disease resistance.
Safe medicine should use high-efficiency, low-toxicity and low-residue pesticides in the production of vegetables. It is forbidden to increase the concentration of liquid medicine at random. The number of medicines should not be too much, and the medicine should be used strictly according to the distance period to prevent the vegetables from causing 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 the pesticides that have expired are purchased or used, it will not only directly cause economic losses, but also easily cause phytotoxicity, and also due to 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 significantly damp and agglomerated, the taste of the drug 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 placed, If the turbidity of the liquid is unclear or stratified (ie, oil-water separation), the precipitate is naturally or floc suspended, indicating that the agent may have failed. The heating method is used in 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 floating method is used in combination with wettable powder pesticides. First take 200 grams of clean water, then weigh 1 gram of pesticide, gently and evenly spread on the surface of the water to observe carefully. In 1 minute, it is wet and can sink to the water is the non-failed pesticide, otherwise it is a failed pesticide.
The suspension method is applied to a wettable powder pesticide. Take 30-50 grams of pesticides, put them in a glass container, first 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 liquid are fine, the sedimentation rate is slow and the amount of sedimentation is small, and the pesticide is reversed. The oscillating method is used in emulsion pesticides. For the pesticides that have oily water layer, first shake the vial with force and let it stand for 1 hour. If it still stratifies, the agent has deteriorated.
Hot melt method is used in 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. It can be reused afterwards; if the precipitate is difficult to dissolve or dissolve, it means it has failed and can no longer be used.
The dilution method is used in 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 average milky white, it will be a failed pesticide, and the more the upper layer of oil, the worse the drug.
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 the wetness in the shed and to reduce the efficacy. At the same time, do not use sulfur preparations to prevent melons and vegetable diseases under high temperature conditions, so as 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 you pay attention to rotation, you can avoid or delay the development of pest and disease resistance.
Safe medicine should use high-efficiency, low-toxicity and low-residue pesticides in the production of vegetables. It is forbidden to increase the concentration of liquid medicine at random. The number of medicines should not be too much, and the medicine should be used strictly according to the distance period to prevent the vegetables from causing 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 the pesticides that have expired are purchased or used, it will not only directly cause economic losses, but also easily cause phytotoxicity, and also due to 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 significantly damp and agglomerated, the taste of the drug 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 placed, If the turbidity of the liquid is unclear or stratified (ie, oil-water separation), the precipitate is naturally or floc suspended, indicating that the agent may have failed. The heating method is used in 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 floating method is used in combination with wettable powder pesticides. First take 200 grams of clean water, then weigh 1 gram of pesticide, gently and evenly spread on the surface of the water to observe carefully. In 1 minute, it is wet and can sink to the water is the non-failed pesticide, otherwise it is a failed pesticide.
The suspension method is applied to a wettable powder pesticide. Take 30-50 grams of pesticides, put them in a glass container, first 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 liquid are fine, the sedimentation rate is slow and the amount of sedimentation is small, and the pesticide is reversed. The oscillating method is used in emulsion pesticides. For the pesticides that have oily water layer, first shake the vial with force and let it stand for 1 hour. If it still stratifies, the agent has deteriorated.
Hot melt method is used in 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. It can be reused afterwards; if the precipitate is difficult to dissolve or dissolve, it means it has failed and can no longer be used.
The dilution method is used in 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 average milky white, it will be a failed pesticide, and the more the upper layer of oil, the worse the drug.
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