STANDARDIZATION AND EVALUATION OF BOTANICAL OIL FORMULATIONS AGAINST SUCKING PESTS OF CHILLI (Capsicum annuum L.)
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Date
2021
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Publisher
University of Horticultural Sciences, Bagalkot. (College of Horticulture, Bagalkot).
Abstract
Considering the demand to use ecofriendly products and finding out
alternative to synthetic pesticides for management of sucking pests in chilli
ecosystem, the experiment was conducted to evaluatebio efficacy of newly formulated
botanical oil combinations from pongamia (Millettia pinnata), neem (Azadirachta
indica), cotton (Gossypium spp.) seed and citronella (Cymbopogon nardus) oil against
sucking pests of chilli in field condition during 2018-19. Investigation carried in
laboratory for standardization of spreader (Detergent powder) concentration for
various pongamia oil concentrations indicated that, 0.3 per cent spreader
concentration was more efficient for stable emulsification of pongamia oil @ 2.5, 5.0
and 10 per cent concentration.
Results from the investigation of phytotoxicity effects of pongamia oil on
chilli plantsshowed that, pongamia oil @ 0.5, 1.0 and 2.5 per cent concentration were
safer to chilli plants. Whereas, at double the dose of pongamia oil @ 5.0 and 10 per
cent concentration recorded the moderate and high phytotoxicity on chilli plants.
Hence, the lower dose of 2.0 per cent of botanical oil was selected as optimal dose for
application in field for chilli pest management.
Further, evaluation of bio efficacy of botanical oils and their combinations @
2.0 per cent against sucking pests of chilli revealed that, combination of Pongamia
oil+ Neem oil+ Cotton seed oil + Citronella oil @ (50:25:15:10 ratio) was superior in
management of sucking pests followed by Pongamia oil+ Neem oil @ (50:50 ratio).
Botanical oils and their combinations were found effective against sucking pests with
no direct impact on honey bees and natural enemies. Significantly higher yield was
obtained from plots treated with Pongamia oil+ Neem oil+ Cotton seed oil +
Citronella oil @ (50:25:15:10 ratio) with 24.07 t/ha with a benefit cost ratio of 2.33
and can be recommended for management of sucking pests in chilli.