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

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Relation http://oar.icrisat.org/29/
http://dx.doi.org/10.1007/s10658-010-9679-9
 
Title Influence of dosage, storage time and temperature
on efficacy of metalaxyl-treated seed for the control
of pearl millet downy mildew
 
Creator Thakur, R P
Rao, V P
Sharma, R
 
Subject Millets
 
Description 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.
 
Publisher Springer
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/29/1/EJPP.pdf
Thakur, R P and Rao, V P and Sharma, R (2011) 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