Pesticide fungicide

A pesticide bactericide is a type of pesticide that can kill or inhibit pathogens such as fungi and bacteria that endanger plants. Such pesticides can poison, kill or inhibit the pathogenic fungi and bacteria that endanger the growth and development of plants, or inhibit the development of spores and mycelium, but do not affect the normal growth of plants. The use of fungicides can control plant diseases. The pesticide fungicides first discovered and used to control plant diseases are mainly chemical elements, natural substances and inorganic compounds. As early as 1000 BC, the disease prevention effect of sulfur was discovered. In 470 BC, olive leaching solution was sprayed to control the disease and wheat seeds were impregnated with a mixture of wine and cypress leaves to control diseases. In 1705, mercury was first used as a wood preservative and later used to control wheat smut. Sulphur has been widely used in the control of plant diseases. After it was found to have special effects on peach powdery mildew in 1824, in 1880, the United States succeeded in controlling grape powdery mildew with stone sulfur mixture, and the history of stone sulfur inhibitors for controlling plant diseases was initiated. In 1761, the treatment of wheat seeds with copper sulphate was used for the first time. In 1882, the French scientist Milaard (PM.A.Millardet) found that Bordeaux mixture had good control effect against grape downy mildew and established Bordeaux mixture in fungicides. The status has so far been applied. From the end of the 18th century to the 1950s, research on organic fungicides was intensified in search of substitutes for copper and mercury preparations. The most influential factor should be the bactericidal action of the dithiocarbamate derivatives reported by Würsdale et al in 1934. This discovery opened up a new era of organic compounds as pesticide fungicides. Following the discovery of the bactericidal activity of thiram, thiram and thiram, in 1935 DuPont discovered the bactericidal activity of the daisen sodium, which was put into production in 1943. After the 1960s, dithiocarbamate fungicides gradually developed into the world's largest class of fungicides. From the early days of the founding of New China to the 1970s, the fungicides in this period were mainly mercury. In the late 1970s, mercury preparations were discontinued, and bactericides such as thiophanate-methyl and carbendazim were used to prevent and control a variety of crop diseases. In this period, the amount of pesticides is generally small, the insecticides are 20-100 ml per mu, and the fungicides are about 30-100 grams per mu. The annual dosage of the city is about 1,500-2,000 tons.