Control Effect of HSAF from Lysobacter enzymogenes OH11 on Pear Valsa Canker

doi:10.16409/j.cnki.2095-039x.2017.01.016

Abstract

Abstract: Control effects of HSAF (heat stable antifungal factor) from Lysobacter enzymogenes OH11 on pear valsa canker (Valsa pyri) were evaluated by mycelial morphology observation and HSAF gel smeared on canker scars under indoor and field conditions. Results showed that HSAF had strong inhibition on mycelial growth of V. pyri with the EC₅₀ value of 0.5 μg/mL. HSAF also resulted in abnormal mycelial morphology, such as curling, branching spots near the tip of mycelia and tip swollen. There were no significant difference between 40 μg/mL HSAF gel and 2.12% copper humic acid water agent treatments, with healing rate of canker scars of 81.3% and 85.3%, respectively. Moreover, 40 μg/mL HSAF gel showed better control effect than that of 2.12% copper humic acid water agent when smeared on canker scars that caused by cold injury or cleft, or canker scars lied in shady side, trunk or center main trunk. However, the control effect of 2.12% copper humic acid water agent was better than that of 40 μg/mL HSAF gel when smeared on the other kinds of canker scars. This study provides a novel biological agent for the control of pear valsa canker.

Key words: HSAF, pear valsa canker, control effect

CLC Number:

S476

CHENG Chao, ZHAO Yancun, LI Hongxu, HE Feng, CAO Sufang, YANG Xiaolei, QIAN Guoliang, LIU Fengquan. Control Effect of HSAF from Lysobacter enzymogenes OH11 on Pear Valsa Canker[J]. journal1, 2017, 33(1): 114-120.

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