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Effect of azoxystrobin and kresoxim-methyl on rice blast and rice grain yield in China.
- Source :
- Annals of Applied Biology; May2015, Vol. 166 Issue 3, p434-443, 10p
- Publication Year :
- 2015
-
Abstract
- Sensitivity to azoxystrobin and kresoxim-methyl of 80 single-spore isolates of Magnaporthe oryzae was determined. The EC<subscript>50</subscript> values for azoxystrobin and kresoxim-methyl in inhibiting mycelial growth of the 80 M. oryzae isolates were 0.006-0.056 and 0.024-0.287 µg mL<superscript>−1</superscript>, respectively. The EC<subscript>50</subscript> values for azoxystrobin and kresoxim-methyl in inhibiting conidial germination of the M. oryzae populations were 0.004-0.051 and 0.012-0.105 µg mL<superscript>−1</superscript>, respectively. There was significant difference in sensitivity to azoxystrobin or kresoxim-methyl between the tested isolates representing differential sensitivity to carbendazim ( MBC) and kitazin P ( IBP); however, there was no correlation between this difference in sensitivity to azoxystrobin or kresoxim-methyl and sensitivity to MBC or IBP, indicating that there was no cross-resistance between azoxystrobin or kresoxim-methyl and MBC or IBP. In the protective and curative experiments, kresoxim-methyl exhibited higher protective and curative activity than azoxystrobin when applied at 150 and 250 µg mL<superscript>−1</superscript> accordingly, while azoxystrobin exhibited stronger inhibitory activity against M. oryzae isolates than that of kresoxim-methyl in the in vitro test. The results of field experiments also suggested that both azoxystrobin and kresoxim-methyl at 187.5 g.a.i. ha<superscript>−1</superscript> gave over 73% control efficacy in both sites, exhibiting excellent activity against rice blast. Taken together, azoxystrobin and kresoxim-methyl could be a good substitute for MBC or IBP for controlling rice blast in China, but should be carefully used as they were both at-risk. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00034746
- Volume :
- 166
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Annals of Applied Biology
- Publication Type :
- Academic Journal
- Accession number :
- 101966069
- Full Text :
- https://doi.org/10.1111/aab.12202