Bio-Ecology and Management of Stem Fly, Melanagromyza Sojae (Zehntner) (Agromyzidae:Diptera) in Soybean Ecosystem
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Date
2011
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UAS Dharwad
Abstract
Studies on the survey, biology, varietal screening, crop loss and management
of soybean stem fly, Melanagromyza sojae (Zehnt.) was carried out both at
Agricultural Research Station, Bailhongal and Main Agricultural Research Station,
University of Agricultural Sciences, Dharwad during kharif 2006 and 2007.
Results of roving survey on the pest status in four districts of major soybean
growing areas of Northern Karnataka revealed that highest per cent stem fly incidence
of 63.48 and 61.08 was recorded in Belgaum and Bidar districts, respectively. The
lower stem fly incidence (12.67%) was recorded in Dharwad. The biology of M. sojae
revealed that the mean incubation, larval and pupal period were 5.0, 9.5 and 10.30
days, respectively. The adult longevity of male and female were 10.50 and 13.00
days, respectively. The total life cycle of stem fly ranged between 23-41 days.
Among the 37 genotypes tested, NRC-55, NRC-51 and DSb-101 were
categorized as resistant, MAS-2000-1 and KSHb-2 as susceptible genotypes. The crop
loss due to M. sojae revealed that the seed dressed with thiamethoxam @ 3 g/kg seed
and foliar application of insecticide treatments (T1 to T5) recorded lower stem T5
(seed dressed with thiamethoxam – imidacloprid – chlorphyriphos – quinalphos –
monocrotophos) recorded higher seed yield of 24.44 and 19.38 q/ha in first and
second date of sowings, respectively. The lower seed yield (11.63 and 11.47 q/ha)
was recorded with untreated check in both the date of sowings, respectively.
Among the organic, adoptive and inorganic modules tested against M. sojae,
the adoptive module (seed treatment with thiamethoxam – imidacloprid spray)
recommended package and organic module. Both soil and topical application of the
adoptive module (seed dressed with thiamethoxam – spray imidacloprid and RDF +
FYM + ZnSO4) recorded significantly highest seed yield (26.88 and 26.54 q/ha) at
Dharwad and Bailhongal, respectively.