Morbidity Rule Of Walnut Stalk Rot Disease And Chemistry Preventing Measures Research

Walnut Stalk Rot Disease was caused by Pythium oligandrum Drechsler. Walnut stalk common symptoms were decay and flew of blackwater, removed the phloem, xylem were decay.lt was very different from Walnut Rot.This study, from the perspective of the Walnut Stalk Rot Disease anniversary laws research, in Walnut Stalk Rot Disease environment, pathogen wintering grounds for research center, key research meteorology, soil and cultivation pattern and management measures and other disease in environmental conditions and the relationship between the disease occurs, through the screening of some highly effective, low toxic chemicals, adopt different ways of applying pesticide, comprehensive prevention and control technology for Walnut Stalk Rot Disease research demonstration provides effective prevention measures. Main researches and results were as follow:1, Walnut Stalk Rot anniversary of law research. According to this survey, Walnut Stalk Rot occured secondary disease epidemic peak a year, on May and August. Disease spot mainly appeared in the old walnut the trunk about 5～20a,11 ～ 15 cm from the ground.2, Walnut Stalk Rot environment research. Occurrence of Walnut Stalk Rot has a close relationship with average temperature and humidity factors. Statistics show that the factors affecting the degree of the onset of Walnut Stalk Rot is comprehensive, in the investigation of the four factors found that the average soil temperature has the most directly faction, the rest of was the average air relative humidity and soil moisture, and the average air temperature.3, Research of Walnut Stalk Rot pathogen wintering site. Through the observation of the vaccination incidence analysis can be concluded:Walnut Stalk Rot wintering site mainly around the strain roots in the soil, wintering in disease tissue pathogen quantity is less than the soil. Approaches of pathogen invasion are trees trunk stem base of the wound.4, Walnut Stalk Rot field control drug screening. By comparing the different methods of applying pesticide found that shaved their disease spot coated processing control effection is superior to the crossing road and applying directly. Test results show that the shave their disease spot coated processing by applying medicament Fulanke, Mixianan and water control effect reached 100%, all the rest of the drug control effects are achieved by more than 78.90%.