Agricultural production of pesticides is indispensable, so mastering the necessary knowledge of pesticides is very important for the majority of farmers and friends. Let's follow the Xiaobian.
Practical pesticide knowledge
1. Bt powder, green worm, and acaricidal bacillus in biological preparations are a kind of commonly used bacterial pesticides, and their insecticidal action is related to the quantity and activity of bacteria. It requires a suitable temperature of 20 to 30 ° C, the humidity needs to be larger, and it is required to avoid direct sunlight. It is best to apply it in the morning or evening when there is dew or on a cloudy day. It is worth noting that the mixing of such pesticides with fungicides will greatly reduce their activity.
2. There are many pesticide varieties that are stable in acidic and neutral media, but are easily decomposed in the presence of alkali. Such pesticides include cytotoxic, anti-virus cockroach, mancozeb, keering, chlorhexidine, carbendazim, jinggangmycin, rotenone, chlorpyrifos, phoxim and pyrethroids. Therefore, such pesticides cannot be mixed with alkaline pesticides such as ketone, Bordeaux, sulfur suspension or stone sulphur, otherwise the efficacy will be reduced.
3, can be killed, copper cream, copper sulfate, copper oxychloride and other copper preparations are a more common type of pesticides . However, there are many pesticides such as methyl thiophanate, carbendazim, dexamethasone, mancozeb, benomyl, and thiram. They cannot be mixed with copper preparations. If mixed, it will reduce the efficacy. half.
4, some pesticide varieties such as dixon, phoxim, rotenone, see light easily decomposed. Therefore, you should try to choose cloudy days, or use it sooner or later. For example, the use of phoxim spray is only valid for 3 to 5 days, but it can be applied to the ground to control underground pests. The validity period can be as long as 1 month.
5, melons, beans are relatively sensitive crops, dichlorvos, ethylphosphonium, diclosan, phoxim, insecticidal double, disease-killing should be used with caution on melon crops; dichlorvos should be used with caution in legumes , trichlorfon, insecticide double, disease and other diseases.
Waterproof pesticides:
1. Quick-acting pesticides These pesticides have a strong contact effect. After 1 to 2 hours, the pests can be killed. It will not affect the efficacy after 2 hours of treatment.
2, systemic pesticides such as omethoate, sputum and other pesticides and carbendazim, thiophanate and other fungicides, such pesticides can be more than 60% of the active ingredients absorbed by the crop after 4 to 6 hours, 6 Even after heavy rain, it can still play a role in insecticide and sterilization.
3, rain-tolerant pesticides such as pesticides resistant to rain, use 2 to 4 hours even if it does not affect the effect, such as Jinggangmycin, Bordeaux mixture.
Want to know more about pesticides, please pay attention to China Pesticide Network
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