Comparative efficacy of strobilurin fungicides against downy mildew disease of pearl millet

Sudisha, J. and Amruthesh, K. N. and Deepak, S. A. and Shetty, N. P. and Sarosh, B. R. and Shekar Shetty, H. (2005) Comparative efficacy of strobilurin fungicides against downy mildew disease of pearl millet. Pesticide Biochemistry and Physiology, 81 (3). 188 - 197. ISSN 1095-9939

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Official URL: https://doi.org/10.1016/j.pestbp.2004.08.001

Abstract

Three commercial formulations of strobilurins, viz., azoxystrobin, kresoxim-methyl, and trifloxystrobin were evaluated for their efficacy against pearl millet downy mildew disease caused by Sclerospora graminicola. In vitro studies revealed inhibition of S. graminicola sporulation, zoospore release, and zoospore motility at 0.1–2μgml−1 of all the three fungicides. The fungicides were evaluated for phytotoxic effects on seed quality parameters and for their effectiveness against downy mildew disease by treating pearl millet by: (1) seed dressing, (2) seed dressing followed by foliar spray, and (3) also by foliar spray alone. The highest non-phytotoxic concentrations of 5, 10, and 10μgml−1 for azoxystrobin, trifloxystrobin, and kresoxim-methyl, respectively, were selected for further studies. Under greenhouse conditions, these fungicides showed varying degrees of protection against downy mildew disease. Among the three fungicides, azoxystrobin proved to be the best by offering disease protection of 66. Further, seed treatment along with foliar application of these fungicides to diseased plants showed enhanced protection against the disease to 93, 82, and 62 in treatments of azoxystrobin, kresoxim-methyl and trifloxystrobin respectively. Foliar spray alone provided significant increase in disease protection levels of 91, 79, and 59 in treatments of azoxystrobin, kresoxim-methyl, and trifloxystrobin, respectively. Disease curative activity of azoxystrobin was higher compared to trifloxystrobin and kresoxim-methyl. Tested fungicides showed weaker translaminar activity, as the disease inhibition was marginal when applied on adaxial leaf surface. Partial systemic activity of azoxystrobin was evident by root uptake, while trifloxystrobin and kresoxim-methyl showed lack of systemic action in pearl millet. A trend in protection against downy mildew disease similar to greenhouse results was evident in the field trials. Grain yield was significantly increased in all strobilurin fungicide treatments over control and maximum increase in yield of 1673kgha−1 was observed in combination treatments of seed treatment and foliar spray with azoxystrobin.

Item Type: Article
Uncontrolled Keywords: Pearl millet ( (L.) R. Br.), Downy mildew, Strobilurin fungicides, Disease management
Subjects: B Life Science > Biotechnology
Divisions: Department of > Biotechnology
Depositing User: manjula User
Date Deposited: 07 Sep 2019 07:06
Last Modified: 07 Sep 2019 07:06
URI: http://eprints.uni-mysore.ac.in/id/eprint/7749

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