Synergistic Effects of Chemical Fungicides with Crude Extracts from Bacillus amyloliquefaciens to Control Northern Corn Leaf Blight

Meng Wang, Haiming Duan (), Cheng Zhou, Li Yu, Xiangtao Meng, Wenjie Lu and Haibing Yu
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Meng Wang: College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, China
Haiming Duan: College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China
Cheng Zhou: College of Life and Health Science, Anhui Science and Technology University, Fengyang 233100, China
Li Yu: College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China
Xiangtao Meng: College of Resource and Environment, Anhui Science and Technology University, Fengyang 233100, China
Wenjie Lu: College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China
Haibing Yu: College of Agriculture, Anhui Science and Technology University, Fengyang 233100, China

Agriculture, 2024, vol. 14, issue 4, 1-16

Abstract: In this research, our objective was to investigate the combined impact of microbial extracts and chemical fungicides on Northern corn leaf blight (NCLB), which is induced by Exserohilum turcicum , and the growth-promoting effect of the crude extracts was also determined. NCLB poses a serious threat to global maize production, necessitating sustainable and environmentally friendly solutions. Mycelial growth rate assays were used to assess the single or synergistic effects of microbial crude extracts and chemical fungicides, and the seed-soaking and root irrigation method was used to detect the growth-promoting effect of the crude extracts on maize seedlings. The results revealed an 84.60% inhibition rate of B. amyloliquefaciens gfj-4 against E. turcicum , and with an EC 50 of 49.01 mg·L −1 for the crude extracts. Chemical fungicides demonstrated varying toxicity levels, with fludioxonil exhibiting the highest potency. The mixture of the crude extracts and pyraclostrobin at an 8:2 volume ratio displayed the highest toxicity ratio of 1.24, indicating a synergistic effect. The selected combinations exhibited strong synergistic effects. Soaking maize seeds with 80 mg·L −1 of the crude extracts followed by root irrigation with 40 mg·L −1 produced the most significant growth-promoting effect on maize seedlings. This study highlights the potential of microbial crude extracts to enhance the control of NCLB when combined with pyraclostrobin, along with its growth-promoting effects on maize seedlings.

Keywords: biocontrol bacteria; maize disease; synergistic mixture; disease control; growth promotion (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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