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| Biological Control Experiment on Leek Gray Mould in Protected Fields |
| WANG Dan1，SHI Zhaopeng1，LI Ping2，LIU Cunhui1，YIN Shanshan1， LI Jishun3，ZUO Libo4，SUN Zuowen1* |
1Plant Protection Station of Shandong Province，Jinan 250100，Shandong，China；2National Agriculture Technology
Extension and Service Center，Beijing 100125，China；3Ecology Institute，Qilu University of Technology （Shandong Academy
of Sciences），Jinan 250103，Shandong，China；4Agriculture Technology Extension and Service Center of Yishui，Yishui
276400，Shandong，China |
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Abstract Grey mold is an important disease for leek cultivation in protected fields．Five Trichoderma
strains were selected and sprayed on leek seedling and field control experiment was carried out on leek gray
mold．The results showed that the control effects of Trichoderma atroviride 20111，T. harzianum C61，T.
harzianum LTR-2，T. harzianum 21990 and T. atroviride 23617 were 13.62%，68.93%，64.00%，91.72%
and 87.23%，respectively．Among them，T. harzianum 21990 had the best control effect．On this basis，
a cooperative control test on Trichoderma sp. and Bacillus subtilis was carried out．The results indicated that
spraying T. harzianum 21990 mixed with water before covering the leek planted shelter，then spraying Bacillus
subtilis when the leek grew up to about 5 cm in height，the field control effect could reach 74.07%．
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Received: 09 April 2020
Published: 24 June 2020
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