INTEGRATED MANAGEMENT OF ROOT GRUBS IN ONION ECOSYSTEM
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Date
2018
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University of Horticultural Sciences, Bagalkot
Abstract
Studies on “Integrated management of root grubs in onion ecosystem” were
conducted in endemic areas of Bagalkot district during the year 2017-18. During the
survey on root grubs, it was confirmed that Holotrichia serrata (F.) was a major species
prevailing to an extent of 91.0 per cent followed by Anomala bengalensis (Blanchard)
(7.0%) and Anomala dorsalis (Fabricius) (2.0%) are the species that were found
damaging in onion crop in all the surveyed areas of Bagalkot district. Among the new
molecules tested against root grubs in onion ecosystem, chlorantraniliprole 18.5 SC at
0.4 ml per litre registered the significantly minimum per cent mortality of onion plants
(1.30%), significantly minimum number of root grub population per square metre area
(0.53) and significantly higher yield levels (43.83 t/ha) with maximum net returns (Rs.
3,63,571/ha) and highest B:C ratio (5.86) compared to standard check, chlorpyriphos 20
EC at 10 ml per litre. Next best new molecule was flubendiamide 480 SC at 0.4 ml per
litre. Further, study on different modules against root grubs in onion ecosystem revealed
that M2-adaptable module (comprising of application of Metarrhizium anisopliae at 10
kg per hectare applied through FYM (Farm Yard Manure) before sowing followed by
chlorantraniliprole 18.5 SC at 0.4 ml per litre at the time of sowing) proved to be quite
effective against root grub population in onion ecosystem by registering the
significantly lowest per cent mortality of onion plants (0.91%), significantly minimum
number of root grubs per square metre area (0.64) and significantly maximum yield
(40.25 t/ha) with higher net returns (Rs. 3,26,738/ha) and B:C ratio (5.31). Although,
M3-Chemi-intensive module bestowed with significantly higher yield (41.06 t/ha) but
resulted in lower B:C ratio (5.13). Therefore, It can be concluded that M2-Adaptable
module was found to be most effective, economical, eco-friendly and easily adoptable
by the farming community.