Pakistan Journal of Zoology Volume 42, Issue 5, 2010, Pages 551-557

Insecticidal activities of essential oils from fruits of Litsea salicifolia Roxb. ex Wall. Against Sitophilus zeamais motschulsky and Tribolium castaneum (Herbst)

Ko, K.^a b , Juntarajumnong, W.^a , Chandrapatya, A.<sup>a 

a</sup>  Department of Entomology, Faculty of Agriculture, Kasetsart University, 50 Paholyothin Road, Jatuchak, Bangkok 10900, Thailand
^b  Plant Protection Division, Myanma Agriculture Service, Bayint Naung Road, West Gyogon, Insein P.O 11011 Yangon, Myanmar


ABSTRACT

The insecticidal activities of essential oil extracted from Litsea salicifolia to Sitophilus zeamais and Tribolium castaneum were investigated under laboratory conditions. Essential oil was extracted by hydro-distillation method and then analyzed by GC/MS. The major components of I. salicifolia were (E)-citral and (Z)-citral. Litsea salicifolia had repellency effect on both insect species even at the lowest application rate (0.16 μg/cm²). In addition, it exhibited fumigant toxicity to S. zeamais, contact toxicity to both species and high antifeedant toxicity to T. castaneum compared to S. zeamais. Hence, L. salicifolia might be considered as a grain protectant to major stored product insects. Copyright 2010 Zoological Society of Pakistan.