Biology and Management of Rice Gall Midge, Orseolia oryzae (Wood-Mason)
Loading...
Date
2011
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UAS, Dharwad
Abstract
Biology of rice gall midge Orseolia oryzae (Wood-Mason) was studied in
detail during August to October under laboratory conditions at ARS, Sirsi. Egg,
maggot and pupal periods occupied 2.50±1.41, 9.00±0.71 and 4.00±0.71 days,
respectively. Average fecundity was 96.5±14.85 eggs/female and total life cycle
occupied 17.50±3.54 days. Among the rice varieties screened at ARS, Sirsi, forty
three were moderately susceptible, nineteen were moderately resistant, ten were
susceptible and remaining eight proved to be highly resistant. None of the tested
varieties were neither resistant nor highly susceptible at 30 and 50 DAT compared to
susceptible check Jaya (21.29% SS). Similarly, among the 48 hybrids screened, forty
one were susceptible, two were highly susceptible and remaining five were highly
resistant. None of the hybrids could be categorized under resistant, moderately
resistant and moderately susceptible group. Among thirty five rice varieties screened
at ZARS, Brahmavara, four rice genotypes proved highly resistant (0% SS); thirty one
genotypes reacted highly susceptible (>25% SS) but none of the genotypes were
resistant (<1% SS); moderately resistant (1-5% SS); moderately susceptible (6-10%
SS) and susceptible (11-25% SS) at 50 DAT. Fipronil 40 WG @ 1 g/l was on par with
carbofuran 3G @ 10 kg/ha for incidence of silver shoot (8.06 and 8.81), grain (65.98
and 64.05) yield and straw (69.73 and 67.01 q/ha) yield followed by profenophs 50
EC @ 2 ml/l. Among the botanicals evaluated, soap nut extract + neem oil @ 2.5%
recorded least per cent silver shoot (17.07) resulting in increased grain (51.19 q/ha)
and straw yield (53.15 q/ha) followed by Randia spinosa @ 20 kg/ha, Gnidia glauca
leaf extract @ 5% and nimbecidine @ 3 ml/l. Higher C:B ratio of 1:3.04 was obtained
from carbofuran 3G @ 10 kg/ha followed by profenophos 20 EC @ 2 ml/l (1:2.77)
and fipronil 40 WG @ 1.0 g/l (1:2.52).
Description
Keywords
Agricultural Entomology