I. Herbicides
Acetochlor
Acetochlor must not be used on watermelon, strawberry or lettuce. Because acetochlor is used on watermelon, strawberry, and lettuce, it can cause phytotoxicity and even kill these crops. In addition, acetochlor should not be recommended on many crops unless acetochlor is registered on such crops, and when used on crops that have already been registered, there is no water accumulation, otherwise it is prone to phytotoxicity. For example, Wones, it is 90% acetochlor, which is registered in rapeseed and cotton, but if there is water, rape, cotton will also cause phytotoxicity or death.
2, rushing grass
Generally, it cannot be used on rice. Although it can be used on rice, it is difficult to grasp because it is difficult to grasp. Therefore, it is not recommended to use it in rice fields.
Second, pesticides
1, chlorpyrifos
Can not be used in the seedling stage of melons and lettuce to avoid the occurrence of phytotoxicity. Especially in the seedling stage of watermelon, it is absolutely impossible to use chlorpyrifos.
2. Organophosphorus pesticides
Organophosphorus pesticides such as phoxim and triazophos cannot be used on melons, and imidacloprid is not recommended. Pyrethroid pesticides, avermectin and the like are relatively safe, but the concentration should be strictly controlled, otherwise it is easy to cause phytotoxicity. In addition, sorghum is sensitive to many insecticides, such as trichlorfon and dichlorvos, so special attention should be paid to the use of sorghum.
Third, inorganic copper preparations
For example, copper hydroxide or copper sulfate is forbidden to be used on peach and plum, otherwise it will cause falling flowers and fruit; copper preparations, sulfur-containing preparations (such as sulfur-mixed carbendazim) should not be applied during the flowering and young fruit stages of crops.
Four triazole fungicides
Triazole fungicides have a "azole" word fungicide, such as triadimefon, tebuconazole, flusilazole, propiconazole, etc., must be strictly controlled when used, can not increase the dosage, otherwise it will inhibit Crop growth or phytotoxicity.
Five, acaricide
Acaricides such as alkyne and other acaricides should be strictly controlled when used in citrus shoots, and should not be used less than 3000 times. It is especially easy to produce phytotoxicity on southern honey pomelo.
In addition, it should be noted that acidic pesticides cannot be mixed with alkaline pesticides. Most pesticides are weakly acidic, and only a few pesticides are alkaline. Alkaline pesticides include inorganic coppers, such as copper hydroxide (which can be killed), copper sulfate, and stone sulphur. These pesticides generally cannot be mixed with other pesticides. Because the base and the acid are neutralized, the effect is affected after mixing, or it is likely to cause phytotoxicity. In addition to the high temperature or in the greenhouse, or during the flowering and young fruit season, pay attention to the concentration of the drug, so as not to occur.
Remedy for phytotoxicity
1. Fertilization and remediation: Generally, for the phytotoxicity of the plaque, the leafy edge of the leaf, and the yellowing of the plant, the application of fertilizer can reduce the degree of phytotoxicity, such as foliar application of foliar fertilizer.
2, irrigation and drainage remedy: for some phytotoxicity caused by herbicides, proper irrigation and drainage can also reduce the degree of phytotoxicity
3. Hormone remediation: For the phytotoxicity of pesticides that inhibit or interfere with gibberellin, spraying gibberellin after phytotoxicity can alleviate the degree of phytotoxicity.
4, water remediation: 1) acetochlor. Acetochlor can never be used on watermelon, strawberry, and lettuce. If used, watermelon must be dead, and strawberries must be dead. Every year, acetochlor is afflicted with watermelon and strawberry. There is also acetochlor which should not be recommended on many crops unless acetochlor is registered on this crop. It is also important to note that even if acetochlor is used on crops that have already been registered, water cannot be accumulated during use, otherwise it is easily phytotoxic. For example, Heines is 90% acetochlor. It is registered in rapeseed and cotton. However, if the water is used in the field in the case of Henas, then rapeseed and cotton are also dead.
2) Chlorpyrifos cannot be used in the seedling stage of melons and lettuce. If used, it is also 100% medicinal.
3) Melons, especially watermelons, should be treated with special caution when used in seedlings. Chlorpyrifos is definitely not used. Organophosphorus pesticides such as phoxim and triazophos cannot be used. Imidacloprid is also not recommended. Pyrethroid pesticides, avermectin and other relatively safe, but also pay attention to the concentration, we must strictly control the concentration, otherwise it is easy to cause phytotoxicity.
4) Inorganic copper preparations, such as copper hydroxide and copper sulfate, are forbidden to be used on peach and plum, otherwise it will easily cause falling flowers and fruits.
5) In the flowering and young fruit stages of the crop, be careful when using pesticides. Copper preparations and sulfur-containing preparations (such as sulphur-mixed carbendazim) cannot be used. To choose a safe drug, the concentration of the drug should be strictly controlled, not too high.
6) Triazole fungicides , that is, there is a "azole" word fungicide, such as triadimefon, tebuconazole, flusilazole, propiconazole, etc., the concentration should be controlled when used, can not be used excessively, otherwise it is easy to inhibit Crop growth, easy to produce phytotoxicity. However, the difenoconazole in the triazole fungicide is Shigao, and its safety is better, and the use of excess amount is not large.
7) Alkynes and other acaricides should be strictly controlled when used in citrus shoots, and should not be used less than 3000 times. It is especially easy to produce phytotoxicity on southern honey pomelo.
8) The grass can not be used on rice. Although it can be used on rice, it is difficult to grasp because it is difficult to grasp. Therefore, it is not recommended to use it in rice fields.
9) Sorghum is sensitive to many insecticides, such as sensitive to trichlorfon and dichlorvos, and special dosage is required for sorghum.
More pesticide knowledge , please pay attention to China Pesticide Network
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