Among the many fungicides, the stone sulfur mixture is widely used by the majority of fruit farmers because of its low price, anti-killing effect on various pathogens, and the advantages of killing red spiders and wintering aphids.
First, the specific method of tanning
The stone sulphur mixture is made of quicklime, sulphur and water. The best ratio of the three is 1:2:10. When cooking, you must use a cast iron pot. If you use a copper pot or an aluminum pot, it will affect the efficacy. First, weigh the high-quality quicklime into the pot, add a small amount of water to digest the lime, then add enough water. After heating and boiling, filter out the slag, and then slowly add the sulphur paste prepared with a small amount of hot water to the pot. Pour in, stir at the same time, and write down the water line, then add the fire to boil, start to time when boiling (keep boiling for 40-60 minutes), the water lost in cooking should be supplemented with hot water, add 15 minutes before the ceasefire foot. When the solution in the pot is dark reddish brown and the slag is blue-green, the fire can be stopped. After cooling filtration or precipitation, the supernatant is the mother liquor of the stone sulphur mixture.
The stone sulphur mixture should be carried out 5-7 days after the pesticide control on the tree, but it must be stopped before the bud of the apple tree buds. Use a concentration of 5 waves. Stone sulfur mixture configuration method:
The amount of water added per kilogram of raw medicine (jin) = the concentration of the original solution ÷ the concentration of the used liquid -1.
Second, the application of "five bogey"
(1) Avoid using it for a long time after preparation. It is best to use the stone sulphur mixture which has been prepared well, otherwise it will reduce the efficacy.
(2) Avoid excessive concentration. The concentration of the stone sulphur mixture in the orchard should be determined according to the climatic conditions and the object of control, otherwise it is easy to cause phytotoxicity. In winter, the temperature is low, the plants are in the dormant stage, and the concentration can be higher; in summer, the temperature is high and the concentration should be lower. Generally, 3-4 waves of stone sulfur mixture can be used in the dormant period of the fruit tree, and only 0.3 to 0.4 wave of stone sulfur mixture can be used in the growth stage.
(3) Avoid mixing at will. Stone sulphur mixture is an alkaline pesticide, which can not be mixed with organophosphorus pesticides and other alkali-suppressing pesticides. Otherwise, it is neutralized by acid and alkali to reduce the efficacy. Some people think that Bordeaux mixture is also an alkaline pesticide, and it is mixed with a stone sulfur mixture. But this law is not appropriate. Because the chemical reaction can also occur after the two are mixed, not only the efficacy is lowered, but also the phytotoxicity is easily caused. In addition, it is not advisable to mix the stone sulphur mixture with other copper preparation pesticides.
(4) Avoid long-term use. Long-term use of stone sulphur will cause resistance to pests and diseases, and the higher the concentration, the faster the resistance will form. Therefore, the stone sulphur mixture should be used interchangeably with other pesticides.
Luochuan County Plant Protection Station
First, the specific method of tanning
The stone sulphur mixture is made of quicklime, sulphur and water. The best ratio of the three is 1:2:10. When cooking, you must use a cast iron pot. If you use a copper pot or an aluminum pot, it will affect the efficacy. First, weigh the high-quality quicklime into the pot, add a small amount of water to digest the lime, then add enough water. After heating and boiling, filter out the slag, and then slowly add the sulphur paste prepared with a small amount of hot water to the pot. Pour in, stir at the same time, and write down the water line, then add the fire to boil, start to time when boiling (keep boiling for 40-60 minutes), the water lost in cooking should be supplemented with hot water, add 15 minutes before the ceasefire foot. When the solution in the pot is dark reddish brown and the slag is blue-green, the fire can be stopped. After cooling filtration or precipitation, the supernatant is the mother liquor of the stone sulphur mixture.
The stone sulphur mixture should be carried out 5-7 days after the pesticide control on the tree, but it must be stopped before the bud of the apple tree buds. Use a concentration of 5 waves. Stone sulfur mixture configuration method:
The amount of water added per kilogram of raw medicine (jin) = the concentration of the original solution ÷ the concentration of the used liquid -1.
Second, the application of "five bogey"
(1) Avoid using it for a long time after preparation. It is best to use the stone sulphur mixture which has been prepared well, otherwise it will reduce the efficacy.
(2) Avoid excessive concentration. The concentration of the stone sulphur mixture in the orchard should be determined according to the climatic conditions and the object of control, otherwise it is easy to cause phytotoxicity. In winter, the temperature is low, the plants are in the dormant stage, and the concentration can be higher; in summer, the temperature is high and the concentration should be lower. Generally, 3-4 waves of stone sulfur mixture can be used in the dormant period of the fruit tree, and only 0.3 to 0.4 wave of stone sulfur mixture can be used in the growth stage.
(3) Avoid mixing at will. Stone sulphur mixture is an alkaline pesticide, which can not be mixed with organophosphorus pesticides and other alkali-suppressing pesticides. Otherwise, it is neutralized by acid and alkali to reduce the efficacy. Some people think that Bordeaux mixture is also an alkaline pesticide, and it is mixed with a stone sulfur mixture. But this law is not appropriate. Because the chemical reaction can also occur after the two are mixed, not only the efficacy is lowered, but also the phytotoxicity is easily caused. In addition, it is not advisable to mix the stone sulphur mixture with other copper preparation pesticides.
(4) Avoid long-term use. Long-term use of stone sulphur will cause resistance to pests and diseases, and the higher the concentration, the faster the resistance will form. Therefore, the stone sulphur mixture should be used interchangeably with other pesticides.
Luochuan County Plant Protection Station
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