Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 162, Issue -, Pages 78-85Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2019.09.004
Keywords
Coumoxystrobin; Mognaporthe oryzae; Sensitivity distribution; Control efficacy; Rice blast
Categories
Funding
- National Key Research and Development Program of China [2016YFD0200503-04]
- Fundamental Research Funds for the Central Universities [KJQN201508]
Ask authors/readers for more resources
Rice blast, caused by Magnaporthe oryzae, is a destructive fungal disease in rice, causing serious losses in yield and quality. Coumoxystrobin is a novel methoxyacrylate strobilurin fungicide. In the current study, we determined the sensitivity of 100 M. oryzae strains to coumoxystrobin based on the mycelial growth inhibition method. The EC50 values ranged from 0.0089 to 0.0290 mu g mL(-1), with a mean EC50 value of 0.0163 +/- 0.0036 mu g(-1), indicating that coumoxystrobin exhibits an excellent inhibitory activity in the mycelial growth of M. oryzae. In addition, the EC50 values had no significant difference among four populations from the different geographical regions. After treating with coumoxystrobin, cell membrane permeability increased, respiration decreased, and the hyphal tips were contorted, with offshoot of top increasing. Protective and curative activity tests showed that coumoxystrobin exhibited better protective and curative activities against M. oryzae in detached barley leaves in comparison to the currently used fungicides tricyclazole and azoxystrobin. Also, it was found that the protective activity was better than its curative activity. Furthermore, compared with the currently used fungicides, coumoxystrobin not only exhibited excellent control efficacy on rice blast, but also markedly reduced the dosages of chemical fungicides in the field trials. Overall, these findings provide important references for revealing the pharmacological effect of coumoxystrobin against M. oryzae and managing rice blast caused by M. oryzae.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available