›› 2012, Vol. 24 ›› Issue (2): 0-262.

• 植物保护 •    

Screening of effective fungicides and optimum period for controlling soybean pod anthracnose

WANG Guo-rong;SUN Zhi-feng;CHEN Wu-jian;LIN Chai;XIA Guo-mian;LOU Man-qin;LOU Bing-gan;*   

  1. 1Institute of Biotechnology, Zhejiang University, Hangzhou 310029, China; 2 Centre of Agricultural Technology Extension Hangzhou Xiaoshan, Hangzhou 311203, China;3 Zhejiang EntryExit Inspection and Quarintine Bureau, Hangzhou 311208, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-03-25 Published:2012-03-25

Abstract: The effective fungicides for controlling soybean pod anthracnose were screened and optimum period for it were studied by field experiment. The control effects of 8 fungicides on anthracnose of soybean pod were tested in field. The results showed that thiophanatemethyl should be used as the first choice fungicide to control soybean pod anthracnose, then pyrimethanil and tabuconazole etc. This experiment was conducted to compare the control effect with spraying thiophanatemethyl at the stage of flower beginning, flower flourish and seed filling of soybean, respectively. The optimal control growth stage was the stage of flower beginning. Applying fungicide two times at the stage of flower beginning, flower flourish or seedfilling of soybean, the control efficiency of soybean pods were significantly higher than applying fungicide one time at the same stage. Applying fungicide one time at the stage of flower beginning and flower flourish or seedfilling of soybean respectively, the control efficiency reached more than 95%. This experiment was conducted to control soybean anthracnose after inoculation at different relative humidity (RH). When RH was less than 90%, whether or not spray thiophanatemethyl, soybean anthracnose symptoms were not observed. When RH was 100%, spraying thiophanatemethyl 24 h after inoculation, the control efficiency showed no significant difference from that without inoculation. Spraying thiophanatemethyl 48 h after inoculation, the control efficiency was significantly lower than that without inoculation.

Key words: soybean anthracnose, flower beginning stage, flower flourish stage, seed filling stage, thiophanatemethyl