Influence of dosage, storage time and temperature on efficacy of metalaxyl-treated seed for the control of pearl millet downy mildew

Thakur, R P and Rao, V P and Sharma, R (2010) Influence of dosage, storage time and temperature on efficacy of metalaxyl-treated seed for the control of pearl millet downy mildew. European Journal of Plant Pathology, 129 (2). pp. 353-359. ISSN 0929-1873

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Abstract

Metalaxyl (Apron 35WS) as a seed treatment has been used extensively to control downy mildew (caused by Sclerospora graminicola) in pearl millet in India. However, the extent of disease control has varied across cultivars, years and locations. We investigated the effects of fungicide dosage, storage time and storage temperature of metalaxyl-treated seed on disease incidence in four pearl millet lines having varying levels of resistance. A linear relationship was found between fungicide dosage (0.5, 1.5 and 2 g a.i. kg−1 seed) and reduction in disease incidence up to 40 days after emergence in all the lines. The normal fungicide dose (2 g a.i. kg−1 seed) protected the crop for up to 20, 40 and 50 days after emergence in highly susceptible (7042S), moderately susceptible (4042R), and moderately resistant (ICMP 451) lines, respectively. However, the quarter and half the normal dosage of fungicide provided protection only up to 20 days after emergence in 7042R and 40 days after emergence in ICMP 451. Storage duration of metalaxyl-treated seed (2 g a.i. kg−1) up to 9 months at 25 ± 2°C did not affect fungicide efficacy. Storage temperatures (5, 25 and 40°C) and duration (30, 60 and 90 days) of metalaxyl-treated seed (2 g a.i. kg−1) showed differential effects in two pearl millet lines 7042S and 843B with downy mildew incidence being significantly lower in 7042S than in 843B. Metalaxyl-treated seed of 7042S and 843B stored at 40°C for different durations showed phytotoxic effects and it was more pronounced in 843B stored for 60 and 90 days where seed germination was inhibited in pot soil.

Item Type: Article
Divisions: UNSPECIFIED
CRP: UNSPECIFIED
Uncontrolled Keywords: Metalaxyl – Pearl millet – Sclerospora graminicola – Storage time – Temperature
Subjects: Mandate crops > Millets
Depositing User: Library ICRISAT
Date Deposited: 12 Dec 2011 13:49
Last Modified: 12 Dec 2011 13:49
URI: http://oar.icrisat.org/id/eprint/4917
Official URL: http://dx.doi.org/10.1007/s10658-010-9679-9
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: Critical review and useful comments by our colleague Dr. Suresh Pande is gratefully acknowledged and contribution of Mr. SM Ahmed in refining the figures is appreciated.
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