Bio-rational Management of Insect Pests of Sword Lily (Gladiolus hybrida L.)
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Date
2017
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Publisher
MPUAT, Udaipur
Abstract
The investigation on “Bio-rational Management of Insect Pests of Sword
Lily (Gladiolus hybrida L.)” was carried out during rabi, 2016-17 in collaboration
with the AICRP on Floriculture at the Horticulture Farm and the laboratory of
Department of Entomology, Rajasthan College of Agriculture, Udaipur. Twenty five
varieties of sword lily were screened for infestation of thrips. Among coloured
varieties, Phule Ganesh (dark red) and Pusa Green Willow (yellow colour) were
highly susceptible with 20.86 and 20.82 thrips per 5-plants, respectively, and recorded
the maximum foliage damage (76.32% and 86.11%); while, Suchitra (light yellow)
variety was least susceptible to thrips with a population of 7.80 per 5 plants
throughout the crop period, besides having the lowest damage (20.51%) by thrips to
foliage, followed by Big Time Supreme (23.81%) and Pusa Subham (24.32%) that
also had the lowest damage by thrips. Light coloured varieties were comparatively
less susceptible to thrips as compared to dark coloured varieties; however, white floret
variety Snow Princess (16.92 thrips/5 plants) was highly susceptible to thrips. The
incidence of thrips initiated in the IV-week of December 2016 (52th SMW) on all
varieties except on variety Suchitra on which the incidence was observed in I-week of
January 2017 (1st SMW). Thrips remained active throughout the crop season; initially,
the population of thrips was very low and gradually increased and reached to the peak
on 26th March, 2017 (12th SMW) at the full bloom in all varieties. The population of
thrips evinced a positive significant correlation with mean atmospheric temperature
and negative significant correlation with mean relative humidity.
The efficacy of bio-rational insecticides evaluated against sword lily thrips in
seven treatment schedules evinced that the treatment schedule comprising two
applications of acetamiprid 20 SP (0.02%) was most effective in reducing the
population of thrips (47.22 and 61.60% 1 and 3 days after spray, respectively). Seven
days after spray, treatment schedule neem oil (1%) followed by emamectin benzoate
5G (0.02%) was most effective in reducing the population of thrips (53.49%). The
treatment schedules comprising two applications of neem oil was least effective with
28.20, 50.99 and 47.31 per cent population reduction at 1, 3 and 7 days after spray,
respectively.
Description
Bio-rational Management of Insect Pests of
Sword Lily (Gladiolus hybrida L.)
Keywords
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Citation
Kumar and Swaminathan, 2017