What precautions should be taken when spraying pesticides at the rice heading stage?
What should be noted when spraying pesticides at the rice heading stage? Please give a detailed introduction. Around the heading stage of rice, it is generally a period when various diseases and insect pests occur and cause damage, requiring the use of chemical pesticides for control, but applying pesticides during this growth stage can easily cause pesticide damage with some pesticides, resulting in losses that should not occur, and attention should be paid to this. 1. Triazole...
What should be noted when spraying pesticides at the rice heading stage? Please give a detailed introduction.
Around the heading stage of rice, it is generally a period when various diseases and insect pests occur and cause damage, requiring the use of chemical pesticides for control, but applying pesticides during this growth stage can easily cause pesticide damage with some pesticides, resulting in losses that should not occur, and attention should be paid to this.
1. Triadimefon. Before rice heading, there are often rice blast and bacterial leaf blight damage, and triadimefon (Bayleton) is commonly used for control, but improper use can cause rice leaves to become short and small, and in severe cases the rice cannot head.
2. Diniconazole. At the early heading stage of rice, pesticides such as diniconazole, for example 12% validamycin-diniconazole wettable powder, are commonly used to control rice false smut. When the pesticide is used in excess, difficulty in heading easily occurs, or the panicle stops after emerging halfway. After using pesticides containing diniconazole such as Quwenxing and Heguoli at the rice breaking stage or the early breaking-heading stage, the growth of the rice panicle neck internode is affected, causing a "neck-enclosed" phenomenon, and the rice cannot head normally.
3. Arsenic preparations. Improper use of arsenic preparations on rice can easily lead to non-grain filling or a decrease in the seed-setting rate.
4. Azole fungicides. Use imidazole fungicides with caution around the heading stage of rice. If used poorly, they will affect heading and grain filling. Compound preparations of hexaconazole and validamycin such as Wensu, and single agents of propiconazole, diniconazole, and thifluzamide such as Dilite, Heguoli, and Mansui, generally have a lasting effect of more than 15 days and have a good effect on controlling rice sheath blight. It should be noted that azole fungicides such as tebuconazole, diniconazole, hexaconazole, and propiconazole can inhibit the formation of gibberellin in rice. When used during the elongation period of the upper internodes of rice, especially when the dosage is increased, they may inhibit internode elongation, leading to difficulty in heading and affecting rice grain filling and seed setting.
5. Glyphosate. Mistakenly spraying glyphosate at the booting stage of rice is very harmful. Mistakenly applying glyphosate to hybrid rice fields can cause large areas of rice fields to fail to head normally, with a yield loss of 80~100%. The young panicle differentiation site is prone to pesticide damage, causing symptoms such as dead heart leaves and deformed young panicles.
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