DEVELOPMENT AND EVALUATION OF FORMULATIONS OF Nomuraea rileyi (Farlow) Samson AGAINST Spodoptera litura (Fabricius) ON CABBAGE
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Date
2018-12
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University of Horticultural Sciences, Bagalkot
Abstract
The present investigation on development and evaluation of formulations of
Nomuraea rileyi (Farlow) Samson against Spodoptera litura (Fabricius) was carried
out at Bio control laboratory, Department of Entomology, Kittur Rani Chanamma
College of Horticulture (KRCCH), Arabhavi during 2017-18. A total of 26 different
formulations (edible oil, talc powder and combination of edible oil + talc powder) of
N. rileyi were developed and screened against laboratory reared third instar larvae of
S. litura. Among all the formulations tested against S. litura, the formulations of
groundnut oil recorded highest mean mortality of 83.33 per cent followed by
combination of groundnut oil + rice grain (80.00%), combination of groundnut oil +
wheat grain (73.33%), mustard oil + rice grain (73.33%), combination of mustard oil
+ ragi grain (70.00%) and mustard oil + wheat grain (70.00%). The most of the
formulations of N. rileyi developed were recorded more than 50.00 per cent mean
mortality of S. litura under laboratory conditions. Four best formulations (groundnut
oil formulation, combination of groundnut oil + rice grain, mustard oil + rice grain
and mustard oil + wheat grain) of N. rileyi were tested for their virulence under
different storage period (3 months) and temperature. The storage of selected
formulations in refrigerator (4˚C) and mud pot filled with wet sand recorded the
highest mortality of S. litura compared to storage under room temperature (27.0 ±
1.0˚C) and incubator conditions (35˚C) after three months of storage period and
storage conditions. Further, selected formulations of N. rileyi were evaluated against
S. litura on cabbage under semi-field condition. Among the different formulations of
N. rileyi, the maximum mean per cent mortality was recorded in the groundnut oil
(31.73 %) followed by combination of groundnut oil + rice grain (29.07%), mustard
oil + rice grain (27.20%) and mustard oil + wheat grain (27.47%) formulations.
However, it is inferior to the NSKE (39.20%) and indoxacarb 14.5% SC (69.07%).