Efficacy of the green lace wing, Chrysoperla zastrowi sillemi (Esben-Peterson) (Neuroptera: Chrysopidae), against sucking pests of tomato: an appraisal under protected conditions

Abstract

Pest infestations in net-houses are not sometimes different from that under open-field conditions, necessitating usage of pesticides. To examine the hypothesis that bioagents may have more potential under restricted plant growing conditions, the predatory potential of green lace wing, Chrysoperla zastrowi sillemi Esben-Peterson (Neuroptera: Chrysopidae) was evaluated against the sucking pests of tomato under screen-house conditions. The rates of release were fixed as 4, 5, and 6 s instar grubs plant⁻¹ and a total of 3 releases were made at 7 days interval, with first release at appearance of the aphid, Myzus persicae (Sulzer) and whitefly, Bemisia tabaci (Gennadius). The pooled data for the years 2018 and 2019 revealed that, the release rates 4, 5, and 6 grubs plant⁻¹ were not statistically different in reducing the population of these pests. The factorial analysis based on the release rate and time of these releases suggested that single release of C. zastrowi sillemi at 4 grubs plant⁻¹ was effective against sucking pests in tomato grown under screen-house conditions.