K. Hariprasad, M. Palakshappa, K. Dinesh, K. S. Iliger
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引用次数: 1
摘要
洋葱紫斑病,由紫斑病引起。是印度洋葱最具破坏性的病害,它在田间条件下造成巨大损失。近年来,生物防治剂在防治紫斑病方面发挥着重要作用。因此,在实验室条件下,采用双重培养技术对9种真菌拮抗剂和8种细菌拮抗剂的效果进行了研究。从研究中可以清楚地看出,与细菌拮抗剂相比,真菌生物制剂在抑制病原体生长方面占上风。在所研究的9种真菌拮抗剂中,菌株Trichoderma vide -1的菌丝抑制率最高,为94.50%;菌株Trichoderma harzianum-1的菌丝抑制率次之,为90.19%。而枯草芽孢杆菌-3对菌丝生长的抑制作用最小,为33.72。
Efficacy of bio control agents under in vitro against Alternaria porri (Ellis) Cifferi. Causing purple blotch in onion
Purple blotch of onion caused by Alternaria porri (Ellis) Cif. is most devastating disease of onion in India has it causes huge loss under field conditions. In the recent days bio control agents are playing an important role in controlling the incidence of purple leaf blotch disease. Hence the study was undertaken to check the efficacy of nine fungal and eight bacterial antagonists under laboratory conditions by employing dual culture techniques. From the study it was clear that fungal bioagents takes upper hand in inhibiting the pathogen growth when compared to bacterial antagonists. Among nine fungal antagonists under study the highest mycelial inhibition was recorded in the isolate Trichoderma viride-1 with the per cent inhibition of 94.50 per cent. Followed by isolate Trichoderma harzianum-1 showing the inhibition per cent (90.19%). However the least inhibition of the mycelia growth 33.72 was noticed in Bacillus subtilis -3 isolate.