Answer: Apple spotted leaf disease can adopt the following methods to prevent and cure: 1. In the late autumn and early winter, the Qingyuan Garden should be cut in the summer to remove the long branches, reduce the source of late infection, improve the permeability of the orchard, and pay attention to drainage in the orchards with low-lying land and high water levels. Rational fertilization, increase tree vigor, and increase disease resistance. 2. Spray (1:2:200) Bordeaux fluid, 10% Shigao water dispersible granules (2000～2500 times), 70% Mancozeb WP (wettable powder) before the onset of illness (after flowering in mid-May) ～600 times liquid, 50% acetaminophen wettable powder 1000 times, 50% fast koning wettable powder 1000 times, 36% thiophanate-methyl suspension 500 to 600 times liquid, 5% bacterioside 600 The control was carried out with agents such as times solution, 1000 times of 10% POM wettable powder, and 800 times solution of 3% POX (new polyoxin). Http://Content/20b7cd0c-8006-484c-9186-ec0faae580a5?cType=2
Chemical Reagent is the relative reference material for chemical research and component analysis. It is an important condition for scientific and technological progress. It is widely used in the synthesis, separation, qualitative and quantitative analysis of substances.
Early chemical reagents simply meant "pure chemicals used in chemical analyses and tests for the purpose of determining the composition or composition of substances". Later it was extended to "a chemical used for the purpose of a chemical reaction", and the term "chemical reagent" refers to a chemical that has long gone beyond this category. Some people think that "chemicals used in scientific experiments" can be called "chemical reagents". A more comprehensive definition of a chemical reagent may be a compound or element of various purity grades used in chemical tests, chemical analyses, chemical studies, and other tests.
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