DEVELOPMENT AND EVALUATION OF FORMULATIONS OF Lecanicillium lecanii (Zimm.) Zare AND Games AGAINST Myzus persicae (Sulzer)
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Date
2018-07
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University of Horticultural Sciences, Bagalkot
Abstract
The research entitled “Development and evaluation of formulations of
Lecanicillium lecanii (Zimm.) Zare and Games against Myzus persicae (Sulzer)” was
carried out at Bio control laboratory, Department of Entomology, Kittur Rani
Chanamma College of Horticulture (KRCCH) Arabhavi, UHS, Bagalkot during
2017-18. The objectives of present investigation were development and laboratory
evaluations of formulations, virulence of formulations of L. lecanii and evaluation of
their effectiveness in controlling M. persicae in field condition. Among the 26
formulations screened, the formulations of ground nut and sesamum oil recorded
highest mean mortality of 96.66 per cent followed by sunflower oil (95%), coconut oil
(94.15%) and mustard oil (93.33%). However most of the formulations of L. lecanii
developed were recorded more than 81.50% mean mortality of M. persicae under
laboratory conditions.
The virulence of four selected formulations of L. lecanii were highest in the
sesamum and groundnut oil based formulations followed by groundnut oil in
combination with rice grain based formulation at different storage condition and
storage period. The storage of selected formulations in refrigerator and mud pot filled
with wet sand recorded the highest mortality of M. persicae compared to storage
under room temperature and incubator conditions after three months of storage.
Further, selected formulations of L. lecanii were evaluated against M. persicae
under semi field and field conditions. Among the selected formulations, the maximum
per cent reduction M. persicae was recorded in sesamum oil followed by groundnut
oil, combination of groundnut oil with rice grain, rice grain alone and commercial
formulation of L. lecanii. However, Imidacloprid and NSKE treatments recorded
highest per cent reduction of M. persicae as compared to selected formulations of
L. lecanii. Considering the cost of cultivation and the gross returns in different
treatments, the benefit cost ratio (BCR) and net returns was calculated. Among the
different treatments, Imidacloprid recorded highest net returns and benefit cost ratio
while, sesamum oil formulation of L. lecanii recorded highest net returns and
B:C ratio as compared to other selected formulations of L. lecanii.