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Bioecology and management of soybean stem fly melanagromyza sojae (zehnt.)

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Title Bioecology and management of soybean stem fly melanagromyza sojae (zehnt.)
 
Creator Kavitha Savajji
 
Contributor R.H.Patil
 
Subject Agricultural Entamology
 
Description Studies on the survey, biology, varietal screening and management of soybean
stemfly, M. sojae was carried out at College of Agriculture, Main Agricultural Research
Station, University of Agricultural Sciences, Dharwad during kharif 2005.
Results of roving survey on the pest status in two districts, (Dharwad and Belgaum)
revealed that the highest per cent stem tunneling of 13.50 and 16.60 per cent was observed
during vegetative and grand growth stage at Dharwad taluk of Dharwad district. Whereas, the
lowest stem tunneling of 10.30 and 12.00 per cent during vegetative and grand growth stage
respectively was observed in Bailhongal taluk of Belgaum district. The Biology of M. sojae
revealed that the mean incubation, larval and pupal period were 5.10, 10.40 and 10.30 days,
respectively. Adult female lived for a longer (13.40 days) period compared to male (11.20
days) with an average fecundity of 81.80+5.95 eggs. The total life cycle of stem fly ranged
between 31 to 57 days.
Among the 27 genotypes tested, NRC-55 was categorized as resistant, NRC-51 and
DSb(PR)-101 as moderately resistant, MAS-2000-1 and MRSB-342 as susceptible
genotypes. All these resistant and moderately resistant genotypes recorded lowest seedling
mortality and stem tunneling compared to susceptible genotypes. With respect to yield, NRC-
55 recorded highest yield (22.04 q/ha) compared to all the other genotypes.
Among all the insecticides tested against stem fly, seed treatment with thiamethoxam
70 WS @ 3 g/kg seed and imidacloprid 70 WS @ 3 g/kg seed resulted in lower incidence of
stem tunneling. All the soil application and seed treatment chemicals were least detrimental
to the tested natural enemies. The highest grain yield was recorded in the seed treatment with
thiamethoxam @ 3 g/kg seed (19.20 q/ha). Net returns was highest (Rs. 11345/ha) in seed
treatment with thiamethoxam @ 3 g/kg seed.
 
Date 2016-09-14T10:32:19Z
2016-09-14T10:32:19Z
2006
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/76576
 
Format application/pdf
 
Publisher UAS, Dharwad