Soil Ecological Regulation And Control Of Potato Late Blight Research

The potato (Solanum tuberosum) is a herbaceous tuber one year living plant. It come of the Andes between Peru and Bolivia.belong to Solanaceae. It is widely cultivated for its nutritional edible tubers.The tubers are component of water 75%-82%, fecula 17.5%, glucose 1.0%, rude albumen 2.0%,and plenty of vitamine. The potato market development potential is one of the four greatest farm crops in the world biggest, our country often the year plant to grow area about 4,000,000 hectares, always producing to reach to 50,000,000 tons or so.The potato are suitable to plant in ChongQing ,and it is one of the important farm crops in ChongQing, the planting area contain more than 310,000 hectares perennialy. The ordinary potato disease in ChongQing is including late blight, virus disease, insect disease, Bacterial wilt.such as.Because of the complexity and inconstancy of the terrain.also with cool and humid climate.the late blight is the most serious potato disease in ChongQing.In 1997 ,the heavy plague of late blight had destroyed the product of potato in ChongQing.in many district ,the yield were low in 100 kilograms, extremely, nearly 27.6% farmland were no any output..In recent years, under the help of the international food agriculture development organization, ChongQing city fetch in the late blight forecasting system of CARAH center(the Centre for Applied Research Agriculture Hainaut) in Belgium. It is a system that built on the late blight condition of air temperature , humidity ,and result in the time of spreying medicine to cease the disease. Because of the complexity terrain and the vertical climate of ChongQing .there should be some modify to this forecasting system.In the meantime, the occurrence of the potato late blight disease is a process of the soil ecosystem system, the unreasonable crop pattern, special ecosystem district, Inconstant soil character, farmer's lacking in the knowlege of the agrochemical and causing the soil pollution, of all can urging a high drug-resistant germ , degenerating the potato quality and anti-disease characteristic, more seriously, It can break the soil ecosystem balance, dissimilating the functional groups rate of soil nematode.soil fungi and make the function of soil ecosystem abnormal. In according , the soil pollution is more serious year by year, soil health index is decreasing, the potato late blight disease index is rising, and the fitness and drug-resistant index of Phytophthora infestans is rising. The reward of farm is declining . By years.it is urgently that taking action on ecosystem ways to cure the potao late blight.The ecosystem ways including that : considering the biologic relation in the whole soil ecosystem, measuring the environment factor surrounding the potato field, suming up the artificial momentum such as : agrochemical.fertilizer.crop pattern,the seed quality etc. The way is based on the quantitive soil ecosystem disease resistant character, the revision of disease forecasting system.