Effects of Biological Agents on Rice Germination and Efficacy Trials on Rhizoctonia solani
[Objective]To investigate the impact of biopesticides on rice germination,seedling emergence,and the control of rice sheath blight.Three biopesticides and two chemical pesticides were selected for exploration.[Method]Three biopesticides(5%jinggangmycin A soluble pow-der,2 billion spores/gram Bacillus amyloliquefaciens wettable powder,and 12%jinggang-mycobacterium wax bud bacterial water agent)and two chemical pesticides(430 g/L propiconazole suspension concentrate and 40%benodanil suspension concentrate)were chosen for safety as-sessment,indoor toxicity testing against rice sheath blight pathogens,and field efficacy trials.The aim was to determine the preventive effects of the five agents against rice sheath blight and assess their application efficacy in the field.[Result]Indoor toxicity testing revealed that the syner-gistic effect of Bacillus amyloliquefaciens and jinggangmycin at a ratio of 4∶1 was most pronounced.In indoor experiments,germination rates for different rice varieties after three days ranged from 49.33%to 58.67%,seven-day germination rates ranged from 89.00%to 93.00%,and seed-ling emergence rates in the 14-day potted trials varied from 90.67%to 93.33%.It was concluded that none of the tested agents had a significant impact on rice germination and seedling emergence.Field trials for controlling rice sheath blight indicated a seventh-day field efficacy of 79.61%for the 12%jinggang-mycobacterium wax bud bacterial water agent.The field efficacy of a 430 g/L propiconazole suspension concen-trate was 67.38%,and a 40%benodanil suspension concentrate showed a field efficacy of 68.44%.[Conclusion]The biopesticide 12%jing-gang-mycobacterium wax bud bacterial water agent can significantly increase crop yield in field trials,which is of great significance for the pro-motion of agricultural green prevention and control technologies.
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