Effect of orange, Citrus sinensis (L.) peel oil on reproduction in Phthorimaea operculella (Zell.).
The effect of orange peel oil on reproduction in the gelechiid Phthorimaea operculella, a pest of potatoes, was investigated. Newly emerged males and females were exposed for 30, 60 or 120 min to the vapour of orange peel oil emanating from filter paper discs impregnated with 40, 80, 160 or 220 µl. After the required exposure, males and females subjected to identical or different treatments were paired singly to facilitate mating and subsequent oviposition by the females. Reproduction was significantly reduced when either males or females were exposed to the oil vapour. The effect increased with an increased of oil dose and exposure time. Egg hatch ranged from 0 to 30% when the moths were exposed to 160 µl of oil for 30-120 min. A further pronounced reduction in egg production and egg viability occurred when the moths were exposed to the vapours arising from paper discs treated with 220 µl.