Bazı bitkisel uçucu yağların Ephestia kuehniella Zeller (Lepidoptera : Pyralidae)'ya fumigant etkileri

Abstract

The fumigant activity of essential oil vapours distilled from lavender ( Lavandula angustifolia Mill.), mint ( Mentha spicata L.), coriander ( Coriandrum sativum L.) and sage ( Salvia officinalis L.)were tested against eggs (1 day-old) and larvae (20-25 days-old) of Ephestia kuehniella Zellerunder 27± 2°C %65 ±5 RH conditions. Treatments were repeated three times; each replicate was conducted with 20 egss or 20 larvae. Exposure times were 24, 48 and 72 hours. Fumigant toxicity was changed according to oils, dose exposure times and biological stage of the pest. It was found that the sensitivities of the eggs and larvae varied according to LC50 values. While the eggs were more sensitive than the larvae against to the lavender oil; in case of coriander and sage oils larvae were found to be more sensitive than eggs. Sensitivity levels of eggs and larvae were similar in mint oil.The lavender oil caused over 95% mortality for the eggs at dose of 225 I¼l/l air in 72 hours. The effectiveness of the mint essential oil was 100 % to the eggs at a dose of 250 I¼l/l air in 72 hours. While mortality rate of the eggs was 98% at the dose of 125 I¼l/l of coriander oil, it was 82% at dose of 75 I¼l/l air of the sage oil.