Augusto, J. and Brenneman, T.B. (2011) Implications of fungicide application timing and post-spray irrigation on disease control and peanut yield. Peanut Science, 38 (1). pp. 48-56.
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Abstract
Applying fungicides at night when the leaves are folded and using irrigation water after application have both been shown to increase deposition of fungicides in the lower plant canopy, improve control of stem rot (caused by Sclerotium rolfsii), and increase peanut (Arachis hypogaea) yield. To evaluate the interactive effects of these two practices, four applications of a protectant fungicide, chlorothalonil (1.26 kg a.i./ha), or a systemic, prothioconazole + tebuconazole (0.23 kg a.i./ha), tebuconazole (0.21 kg a.i./ha), flutolanil + propiconazole (0.45 kg a.i./ha), pyraclostrobin (0.21 kg a.i./ha), or two applications of a systemic, fluoxastrobin (0.17 kg a.i./ha) or azoxystrobin (0.31 kg a.i./ha) were sprayed either at night (3 a.m. to 5 a.m., when peanut leaves were folded) or during daylight (10 a.m. to 12 p.m., when peanut leaves were unfolded). Fungicides were applied as sub-subplots and night and day fungicide application timings as subplots in a split-split plot design with post-spray irrigation and nonpost-spray irrigation as whole plots to evaluate disease control and peanut yield in 2008 and 2009. In 2008, leaf spot intensity (early leaf spot caused by Cercospora arachidicola) was low and disease control was similar regardless of application timing or fungicide across post-spray irrigation treatments. In 2009, leaf spot was severe and disease control for night and day applications of a systemic fungicide was similar across post-spray irrigation, but pyraclostrobin and prothioconazole + tebuconazole had the lowest ratings. Interaction of fungicide, application timing and post-spray irrigation was significant for stem rot and yield. Night application of prothioconazole + tebuconazole, flutolanil + propiconazole or pyraclostrobin showed the most increase in stem rot control and yield compared with day application among the evaluated fungicides, but the positive effects on stem rot control and yield were minimal with post-spray irrigation. The effects of application timing and post-spray irrigation on fungicide efficacy were not the same for all fungicides.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Arachis hypogaea, post-spray irrigation, night fungicide application, day fungicide application, Sclerotium rolfsii |
| Author Affiliation: | Postdoctoral Research Associate and Professor, respectively, Department of Plant Pathology, The University of Georgia, Coastal Plain Experiment Station, P. O. Box 748, Tifton, Georgia 31793-0748 |
| Subjects: | Plant Production Plant Protection |
| Divisions: | Groundnut |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 04 Feb 2013 04:57 |
| Last Modified: | 04 Feb 2013 04:57 |
| Official URL: | http://dx.doi.org/10.3146/PS10-11.1 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/9476 |
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