Bioassay of 51 strains of Bacillus thuringiensis to Bursaphelenchus xylophilus had been studied in laboratory. Two of them had higher toxicity to B. xylophilus. Extraction of endotoxin and exotoxin of the two isolates...Bioassay of 51 strains of Bacillus thuringiensis to Bursaphelenchus xylophilus had been studied in laboratory. Two of them had higher toxicity to B. xylophilus. Extraction of endotoxin and exotoxin of the two isolates to B. xylophilus showed the action of exotoxin higher than that of endotoxin.展开更多
In order to determine the nematicidal activity of Tea saponin(TS),the oil tea cakes were processed through degreasing,dealcholizing,and extracting with n-butyl alcohol,the crude powder of 84.6% TS was obtained.The TS ...In order to determine the nematicidal activity of Tea saponin(TS),the oil tea cakes were processed through degreasing,dealcholizing,and extracting with n-butyl alcohol,the crude powder of 84.6% TS was obtained.The TS powder was evaluated against 4 plant nematodes and 1 soil nematode.The results indicated that TS exhibited modest nematicidal activity against the 4 plant nematodes,but exhibited no nematicidal activity against Rhbiditis sp..The pot experiments showed that infective inhibition of TS against Hrischamanniells oryzae is 71.1%,galls on Trichosanthes kirilowii caused by Meloidogyne incognita was reduced by 88.9% when the bare-root-tip was placed in TS solution for 3 h.展开更多
文摘Bioassay of 51 strains of Bacillus thuringiensis to Bursaphelenchus xylophilus had been studied in laboratory. Two of them had higher toxicity to B. xylophilus. Extraction of endotoxin and exotoxin of the two isolates to B. xylophilus showed the action of exotoxin higher than that of endotoxin.
文摘In order to determine the nematicidal activity of Tea saponin(TS),the oil tea cakes were processed through degreasing,dealcholizing,and extracting with n-butyl alcohol,the crude powder of 84.6% TS was obtained.The TS powder was evaluated against 4 plant nematodes and 1 soil nematode.The results indicated that TS exhibited modest nematicidal activity against the 4 plant nematodes,but exhibited no nematicidal activity against Rhbiditis sp..The pot experiments showed that infective inhibition of TS against Hrischamanniells oryzae is 71.1%,galls on Trichosanthes kirilowii caused by Meloidogyne incognita was reduced by 88.9% when the bare-root-tip was placed in TS solution for 3 h.