| Agricultural chemical is used for preventing, eliminating or controlling diseases,insect, weed and other pest harmful in agriculture and forestry, and is aiming toregulate the chemiosynthesis of plants and insects or its a sorts of corporeal mixture aswell as pharmaceutics obtained from biological materials,including effective extractsin organisms, such as derris, manual simulating synthetics e.g. corpus, acetum,hormone, pheromone, except for living bodies such as natural enemies of pest ect.Chemical controlling of disease, plays a important role in crop producing.The introduction of this paper summarizes types&functions of agriculturalchemicals and biochemicals. Additionally, characteristics of kinds of diseasesoccurring on grains like rice, maize, economic crops like rubber tree, tobacco etc.vegetables like cucumber, tomato, potato,cabbage, pepper etc. fruits like banana,grape, watermelon etc. are also generally described.Though serious investigation and experiments, which were designed based onconsidering regions, various influences such as climate, soil, cultivar etc, we selectedthe high-effective chemicals and their optimal applying method for curing thecharacteristic diseases respectively in different regions of Yunnan according to thecollected data analyzed with software such as SPSS and EXCEL.The results are listedas follows:40%isoprothiolane is best chemical used on Rice blast control with average88.85%inhibition ability, with dosages of pharmaceutics drug,1687.5g/hectare, active constituent675g/hectare. We also found11%well-hexa wettable powder isefficient one for controling rice sheath blight disease.Cucumber downy mildrew is cured with60%enoyl-esculentoside phosphinealuminium with the best average inhibition of90.20%, with pharmaceutics drug1500g/hectare while active constituent900g/hectare. For other cucumber disease,40%pyrimethanil water dispersion for cucumber gray mold disease,43%chlorotholanil tabuconazole for cucumber powdery mildew are confirmed by ourinvestigation and we also found50%fluazinam suspending is best used for the Rosemildew, and70%propineb hydrophilic powders are best for Chinese cabbagecontrolling.Tabacco black shank disease is controlled by80%fosetyl-aluminiumhydrophilic powers with85.04%inhibition ability with, pharmaceutics drug6093.75g/hectare, and active constituent4875.0g/hectare. Tobacco anthracnose wastreated with80%mancozeb WP obtaining the average efficacy of89.67%, withdosage of2700g/hectare, active ingredient dosage of2160g/hectare. Tobaccobrown spot disease, was controlled with10%antimycin WP; while2%lentinan asare better agency for Tobacco mosaic virus.Banana black star disease is cured with75%oxime germ tebuconazole (na diwen) get protection rate of75.20%, with2500tome dilution and dosages forpharmaceutics drug400g/hectare, while active constituent300g/hectare.For bananaleaf spot diease,25%epoxiconazole is the better chemical.Watermelon plight is cured with70%propineb (An Tai Sheng product)hydrophilic powers with the85.16%, control ability by using dosages ofpharmaceutics drug3000g/acreage, active constituent2100g/hectare, we also foundthat5%amino oligosaccharide for watermelon fusarium wilt,40%Difenoconazolemicroemulsion for watermelon anthracnose have good control potential.For the rubber tree powdery mildew,8%Flusilazole HN is better, and the latteraverage protection rate can reach85.02%, with dosage of1624.95g/hectare, activeingredient130g/hectare. For the rubber tree anthracnose,10%Difenoconazole HNare better chemical.We found that1%sanguinarine WP are good chemical for Grape powderymildew control,70%propineb wettable powder for sweet pepper blight,70%mancozeb water dispersion granula for tomato early blight, and50%dimethomophfosetyl aluminium wettable powder for potato late blight protection. But when1% sanguinarine WP is used for curing grape brown spot diease,the result was notideal,even with negative data.The results provides strong and effective references for many agriculturalresearchers and producer as well for farmland disease control by chemicalreagents.The result is also useful for the agricultural chemicals’ registration andwidely application, and it provides a wide range of reagents for controls of cropsdiseases in Yunnan which indicates great importance and application values. Most ofall, the bio-control reagents listed in our experiments has a bright future for itsenvironmental benefice in the long run. |
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