Lime sulfur is a pesticide having insecticidal, acaricidal and bactericidal action, the active ingredient is calcium polysulfide. Spraying on the surface of the crop takes a series of chemical reactions in the air to form fine monomeric sulfur and a small amount of hydrogen sulfide to exert its effects. The pesticide is alkaline and has the function of corroding the waxy layer of the epidermis of the insect, and has a good killing effect on the scale insect having a thick waxy layer and some eggs of the mites.
The stone sulphur mixture is not only a commercial preparation of commercial products, but also can be made by itself. Industrial production is synthesized by using quicklime, sulfur, water and metal catalyst under high temperature and high pressure. It is divided into two types: water agent and crystal. The crystal appearance is pale yellow column and soluble in water. Ordinary stone sulphur mixture is made by adding lime and sulfur powder as raw materials, and the raw material ratio is 1 part of quicklime, 2 parts of sulfur powder and 12-15 parts of water. The method of tanning is to first put the quicklime into the iron pan and add a small amount of water to make it, to make the lime milk, and then add enough water to boil, and then add the sulfur slurry which has been previously mixed with a small amount of water to form a paste. Stir while stirring, and write down the water line. Add over a large fire for 40 to 60 minutes, and continue to stir, timely make up the amount of water (preferably boiling water), when the liquid is reddish brown, stop the fire, after cooling, filter the sediment, which is the stone sulfur mixture.
Applicable crops and control objects Stone sulphur mixture is mainly used to control citrus tree scale insects, rust tick, red spider, apple, pear, peach, apricot, tea leaves and other winter insects, ornamental plant scale insects. In addition, the stone sulphur mixture can also be used as a protective bactericide for the control of powdery mildew, rust, grape downy mildew, leaf spot and other diseases of wheat, apple, pear and walnut.
The raw material of the stone sulphur mixture which is made by using the technology itself is generally 20 to 26 Baume degrees. Before use, the Baume pycnometer is used to measure the Baume degree of the original liquid, and then diluted with water as needed. During the dormant period of the fruit tree, as a clearing agent for the orchard, the pests and germs that survive the winter on the tree are eradicated, and the dosage is 3 to 5 Baume. The growth and control of the pests and diseases can only be sprayed with a dilution of 0.3 to 0.5 Baume. . Commercial preparations are used as follows.
Citrus red spider, scale insect, and rust-walled sulphur mixture are mainly used in clearing gardens after fruit picking until germination. After the fruit harvest, in the autumn season, bio-pesticide experts recommend using 45% crystal powder 300-500 times liquid or 29% water agent 200-300 times liquid spray; before early spring germination, use 45% crystal powder 180-300 times liquid spray.
The deciduous fruit leaves and other winter pests in the spring germination stage, using 45% crystal powder 60-80 times liquid, or 29% water agent 30 ~ 40 times liquid evenly sprayed the tree.
Before the tea leaves are germinated, the pesticide manufacturer recommends using 45% crystalline powder 100 times liquid or 29% water agent 50 times liquid to spray evenly.
Before the germination of the ornamental plant scale tree, use 45% crystal powder 80~100 times liquid, or 29% water agent 50-70 times liquid to spray evenly.
In the early stage of the onset of wheat powdery mildew, use 45% crystalline powder 200~300 times solution, or 29% water agent 150~200 times solution to spray evenly.
The Chinese pesticide network reminds us that the agent cannot be mixed with other drugs. The efficacy of the sulphur sulphur mixture and the possibility of phytotoxicity are positively correlated with the temperature, especially in the growing season. High-temperature application should be avoided. Some plants with fragile leaf tissue are prone to phytotoxicity and should be used strictly in accordance with the instructions. If you accidentally get contaminated or splashed your eyes, rinse immediately with plenty of water or 1:10 vinegar. If you have serious symptoms, take it to the hospital immediately. Due to the corrosive nature of the stone sulphur mixture, copper and aluminum appliances cannot be used during tanning and storage. The self-made stone sulphur mixture should be stored in a small mouth container when it is stored. Adding a little diesel oil to the liquid surface can effectively isolate the air and prolong the storage period.
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