Fungal diseases occur seriously in Pseudostellaria heterophylla in Qian- dongnan Prefecture of Guizhou Province from March to May every year. By field in- vestigation, tissue isolation and microscopic identification, ...Fungal diseases occur seriously in Pseudostellaria heterophylla in Qian- dongnan Prefecture of Guizhou Province from March to May every year. By field in- vestigation, tissue isolation and microscopic identification, the main pathogen was iden- tified as Rhizoctonia solanL the pathogen of damping-off disease. At the same time, Alternaria alternate was also isolated from the sampled diseased soil, and it has pathogenicity to Pseudostellaria heterophylla seedlings. The bio-control test showed that GH18 strain （Bacillus spp.） had significant inhibitory effects on Rhizoctonia solani and Alternaria alternate.展开更多
Pencycuron is a non-systemic protective fungicide for controlling sheath blight of rice. However, information on the fate of pencycuron in rice plant is lacking. The degradation of pencycuron in waterlogged tropic ric...Pencycuron is a non-systemic protective fungicide for controlling sheath blight of rice. However, information on the fate of pencycuron in rice plant is lacking. The degradation of pencycuron in waterlogged tropic rice field was investigated.Pencycuron was applied at recommended field dose (187.5 g a.i./ha) and double recommended dose to cropped plots for three consecutive years. Pencycuron was rapidly degraded in rice plant at all doses of pencycuron application with first order half-lives of 1.57～2.77 d. The study revealed that pencycuron is safe from the human and environmental contamination point of view.展开更多
Strain T02-25 was selected from approximately 30 rhizosphere isolates of Trichoderma species isolated from roots of crops. Its biological activity against Rhizoctonia solani was determined for the control efficacy to ...Strain T02-25 was selected from approximately 30 rhizosphere isolates of Trichoderma species isolated from roots of crops. Its biological activity against Rhizoctonia solani was determined for the control efficacy to pepper seedling blight caused by R. solani in the field. The assay methods were treating R. solani sclerotia by Trichoderma conidial suspension (10^6cfu ml^-1) and scattering Thichoderma rice bran over the pepper root medium. The results showed that T02-25 was active against R.solani in both ways, and its control efficacy was 82.7% and 78.0%, respectively. In addition to comparison of the efficacy of the two application methods, the relationship of different factors in the control efficacy of Trichoderma against R. solani was discussed.展开更多
基金Supported by National Natural Science Foundation of China(31201160)Joint Fund of Science and Technology Department of Guizhou Province(QKH-J-LKK[2013]11)+1 种基金Agricultural and Forestry Diseases and Pests Identification and Control Science and Technology Innovation Team in Southeast Guizhou(QJHRCTD[2014]48)Excellent Scientific Research and Innovation Team Project of Science and Technology Department of Guizhou Province(QJHRCTD[2013]26)~~
文摘Fungal diseases occur seriously in Pseudostellaria heterophylla in Qian- dongnan Prefecture of Guizhou Province from March to May every year. By field in- vestigation, tissue isolation and microscopic identification, the main pathogen was iden- tified as Rhizoctonia solanL the pathogen of damping-off disease. At the same time, Alternaria alternate was also isolated from the sampled diseased soil, and it has pathogenicity to Pseudostellaria heterophylla seedlings. The bio-control test showed that GH18 strain （Bacillus spp.） had significant inhibitory effects on Rhizoctonia solani and Alternaria alternate.
基金Project supported by Bayer Crop Science India Ltd., India
文摘Pencycuron is a non-systemic protective fungicide for controlling sheath blight of rice. However, information on the fate of pencycuron in rice plant is lacking. The degradation of pencycuron in waterlogged tropic rice field was investigated.Pencycuron was applied at recommended field dose (187.5 g a.i./ha) and double recommended dose to cropped plots for three consecutive years. Pencycuron was rapidly degraded in rice plant at all doses of pencycuron application with first order half-lives of 1.57～2.77 d. The study revealed that pencycuron is safe from the human and environmental contamination point of view.
文摘Strain T02-25 was selected from approximately 30 rhizosphere isolates of Trichoderma species isolated from roots of crops. Its biological activity against Rhizoctonia solani was determined for the control efficacy to pepper seedling blight caused by R. solani in the field. The assay methods were treating R. solani sclerotia by Trichoderma conidial suspension (10^6cfu ml^-1) and scattering Thichoderma rice bran over the pepper root medium. The results showed that T02-25 was active against R.solani in both ways, and its control efficacy was 82.7% and 78.0%, respectively. In addition to comparison of the efficacy of the two application methods, the relationship of different factors in the control efficacy of Trichoderma against R. solani was discussed.
