How to avoid pesticide damage to flowers? Practical prevention methods you need to master

How to avoid pesticide damage to flowers.

Although using chemical pesticides can control flower pests and diseases, improper use can very easily cause pesticide damage to flowers. Pesticide damage can generally be divided into acute pesticide damage and chronic pesticide damage. The main symptoms are uniform spots appearing on the leaf surface, leaf edges curling and scorching, and slowed plant growth, and in severe cases it can even lead to death. Therefore, the concentration and dosage of pesticides must be strictly controlled. If it is found that using the standard dosage and concentration of pesticide cannot achieve the expected effect, the pesticide variety should be changed. Pesticides must not be mixed at will, so as to avoid causing pesticide damage.

1. Random mixing of pesticides: When flower diseases and insect pests occur at the same time, people usually mix insecticides and fungicides, using two or three agents, and some even add foliar fertilizer. If several pesticides have the same properties and similar pH values, no chemical reaction will occur, and there will be little effect on pesticide efficacy; otherwise, it will affect the performance of the pesticide efficacy and also cause pesticide damage. For example, Bordeaux mixture is a suspension prepared from copper sulfate, quicklime and water. It can control many fungal diseases. Its liquid is alkaline and cannot be mixed with commonly used pesticides, nor with lime sulfur mixture or rosin agents, otherwise it will reduce pesticide efficacy and cause pesticide damage. Therefore, when mixing pesticides, you must first understand their pharmacological characteristics. Those that can be mixed may be mixed, while those that cannot be mixed must be used separately.

2. Inappropriate spraying time and methods: The spraying interval is too short. In different periods of pest and disease occurrence, the length of the pesticide spraying interval varies. Generally, it is once every half month in the initial stage and once a week at the peak stage. In reality, many pests are difficult to kill and pathogens are difficult to eradicate, so some flower growers use pesticides frequently, some once every 3 days, and some even once a day. As a result, the pests are not killed, the disease is not eradicated, but pesticide damage appears in flower seedlings. In this situation, the spraying interval must be strictly controlled, otherwise pesticide damage is even harder to treat than pests and diseases. During control, pay attention to alternating the use of pesticides to prevent pests and pathogens from developing resistance, causing frequent application and ultimately leading to pesticide damage; some flower growers, when spraying pesticides, do not spray the pesticide onto the key parts, and sometimes let it stay too long on a certain part, causing a large amount of pesticide solution to remain on the leaf surface and resulting in pesticide damage to flowers. This phenomenon is especially obvious on old leaves and large leaves.

3. Nonstandard pesticide preparation procedures: There are many formulations of chemical agents, including wettable powders, emulsions, tablets, granules, solutions, etc. Some of these formulations can dissolve directly, while others cannot dissolve completely. Undissolved particles suspended in the solution can very easily clog the nozzle during spraying. Even if smaller particles are sprayed out from the nozzle, they remain on the leaf surface, causing localized pesticide damage to the plant. Therefore, when preparing pesticides, pay attention to strictly following the procedures. First dissolve pesticides of different formulations in a small container, then transfer them into a large container, and after they are completely dissolved or evenly melted, transfer them into the sprayer.

4. Sprayers are not cleaned and other pesticide residues remain: In actual operation, flower growers often use certain sprayers as general-purpose pesticide tools. Sometimes after using one type of pesticide, they fill another type of pesticide without cleaning it. As a result, the original pesticide residues cause pesticide damage to flowers, especially residues of pesticides such as herbicides, which are even more harmful to flowers.

5. Flower allergies to pesticides. Practice has proved that some flowers are allergic to certain specific pesticides. For example, cockscomb and Chinese rose are quite sensitive to dichlorvos, and chrysanthemum is sensitive to dimethoate emulsifiable concentrate at dilutions of 1500 times or below. Even when the pesticide concentration is not high and the operation is fully standard, pesticide damage still occurs. At present, there are no rules to follow for flower allergies to pesticides, and they can only be explored through practice. This requires that when applying pesticides that are not very familiar, a pesticide damage test should be done first, so as to reduce the occurrence of pesticide damage.

1. Random mixing of pesticides: When flower diseases and insect pests occur at the same time, people usually mix insecticides and fungicides, using two or three agents, and some even add foliar fertilizer. If several pesticides have the same properties and similar pH values, no chemical reaction will occur, and there will be little effect on pesticide efficacy; otherwise, it will affect the performance of the pesticide efficacy and also cause pesticide damage. For example, Bordeaux mixture is a suspension prepared from copper sulfate, quicklime and water. It can control many fungal diseases. Its liquid is alkaline and cannot be mixed with commonly used pesticides, nor with lime sulfur mixture or rosin agents, otherwise it will reduce pesticide efficacy and cause pesticide damage. Therefore, when mixing pesticides, you must first understand their pharmacological characteristics. Those that can be mixed may be mixed, while those that cannot be mixed must be used separately.

2. Inappropriate spraying time and methods: The spraying interval is too short. In different periods of pest and disease occurrence, the length of the pesticide spraying interval varies. Generally, it is once every half month in the initial stage and once a week at the peak stage. In reality, many pests are difficult to kill and pathogens are difficult to eradicate, so some flower growers use pesticides frequently, some once every 3 days, and some even once a day. As a result, the pests are not killed, the disease is not eradicated, but pesticide damage appears in flower seedlings. In this situation, the spraying interval must be strictly controlled, otherwise pesticide damage is even harder to treat than pests and diseases. During control, pay attention to alternating the use of pesticides to prevent pests and pathogens from developing resistance, causing frequent application and ultimately leading to pesticide damage; some flower growers, when spraying pesticides, do not spray the pesticide onto the key parts, and sometimes let it stay too long on a certain part, causing a large amount of pesticide solution to remain on the leaf surface and resulting in pesticide damage to flowers. This phenomenon is especially obvious on old leaves and large leaves.

3. Nonstandard pesticide preparation procedures: There are many formulations of chemical agents, including wettable powders, emulsions, tablets, granules, solutions, etc. Some of these formulations can dissolve directly, while others cannot dissolve completely. Undissolved particles suspended in the solution can very easily clog the nozzle during spraying. Even if smaller particles are sprayed out from the nozzle, they remain on the leaf surface, causing localized pesticide damage to the plant. Therefore, when preparing pesticides, pay attention to strictly following the procedures. First dissolve pesticides of different formulations in a small container, then transfer them into a large container, and after they are completely dissolved or evenly melted, transfer them into the sprayer.

4. Sprayers are not cleaned and other pesticide residues remain: In actual operation, flower growers often use certain sprayers as general-purpose pesticide tools. Sometimes after using one type of pesticide, they fill another type of pesticide without cleaning it. As a result, the original pesticide residues cause pesticide damage to flowers, especially residues of pesticides such as herbicides, which are even more harmful to flowers.

5. Flower allergies to pesticides. Practice has proved that some flowers are allergic to certain specific pesticides. For example, cockscomb and Chinese rose are quite sensitive to dichlorvos, and chrysanthemum is sensitive to dimethoate emulsifiable concentrate at dilutions of 1500 times or below. Even when the pesticide concentration is not high and the operation is fully standard, pesticide damage still occurs. At present, there are no rules to follow for flower allergies to pesticides, and they can only be explored through practice. This requires that when applying pesticides that are not very familiar, a pesticide damage test should be done first, so as to reduce the occurrence of pesticide damage.