Fruit trees use stone sulphur mixture to follow the "four when", specifically with the pesticide network Xiaobian to understand:
First, the object of prevention and treatment. Although the stone sulphur mixture is widely used, it is not a “universal pesticideâ€. If the unselected object is used on all fruit trees, the result will cause some sensitive fruit trees to cause phytotoxicity. Citrus anthracnose, scab, resin disease, scab and acarid; powdery mildew of apple, chestnut and strawberry; pear scab, anthracnose; gum disease of peach, plum, apricot, plum, cherry Sexual perforation; grape black pox; persimmon anthracnose and mites, etc., can use different concentrations of stone sulphur mixture at different times.
Second, the use of concentration. Some farmers use the sulphur sulphur mixture when the concentration is about 1 degree, so that some fruit trees have poor control effect, and some fruit trees even have phytotoxicity, so it should be based on different fruit trees, different control objects, and different climatic conditions. Reasonably determine the concentration used. Such as the prevention and control of citrus anthracnose, scab, resin disease and mites, spring and autumn should use Bamei 0.3 to 0.5 degrees; summer should use Bamei 0.3 degrees; winter should use Bamei 5 degrees. To prevent bacterial perforation of peach and plum, it is recommended to use Bamei 5 degrees before germination and 0.3 degrees after Baize. In short, the specific information should be consulted when using it, and the concentration should be determined as needed.
Third, mixed use. Mixing the stone sulphur mixture with other pesticides at will, the result is not good. Pesticide manufacturers remind everyone that the stone sulphur mixture is strongly alkaline. If mixed with acidic pesticides, the acid-base neutralization reaction occurs, which reduces the efficacy. Bordeaux mixture is alkaline, but it can not be mixed with stone sulphur mixture. As the mixture of the two increases the amount of copper dissolved, copper ions can interfere with the activity of enzymes in plants and cause phytotoxicity. Therefore, the fruit tree sprayed the Bordeaux mixture for 15 to 20 days before spraying the stone sulphur mixture, and spraying the sulphur mixture for 7 to 10 days before spraying the Bordeaux mixture. Stone sulphur mixture can not be mixed with rosin mixture, cotton oil soap and acidic pesticides. If it is necessary to mix the stone sulphur mixture with the acidic pesticide, it can only be used with a low concentration of stone sulphur mixture, and it must be applied with mixing and not stored for a long time.
Fourth, the use of temperature when. Regardless of the temperature, the use of stone sulphur mixture often causes phytotoxicity. Practice has proved that the general crops should not use stone sulfur mixture when the temperature is below 4 ° C in early spring and high temperature above 32 ° C in summer. If it is sprayed on the fruit of Wenzhou mandarin orange at high temperature, it is easy to cause sunburn. The fruit trees such as peach, plum, pear, apple and so on which are sensitive to stone sulfur mixture are mainly sprayed before germination in winter or early spring.
The China Pesticide Network reminds everyone that the above four points should be strictly followed, and scientific and rational use of drugs can achieve good drug efficacy and avoid the occurrence of pesticide safety accidents.
Realistic pen and ink painting is a pen and ink painting creation using realistic techniques, which is essentially different from all previous pen and ink paintings. In the past, there were signs that one kind of "work" served another kind of "work". The nature of its existence seemed to have no independence "forever". Even if some works had strong independence, they could not get rid of the fate of "attachment". Realistic pen and ink painting is different. It is independent. Its existence has no "dependency". Its existence itself is its ultimate result.
Pen Sketch,Sketch Pen Drawing,Black Pen Sketch Drawing,Pen Sketch Drawing
The universe in the stone is great , https://www.zdsarts.com