Document Type : Research Paper
Authors
1
Department of Plant Protection, School of Agriculture, Shiraz University, Shiraz, Iran
2
Department of Plant Protection, School of Agriculture, Shiraz University, Shiraz, Iran.
3
Department of Plant Protection, school of agriculture, Shiraz University, Shiraz, Iran
4
Department of Horticultural Sciences, School of Agriculture, Shiraz University, Shiraz, Iran
Abstract
Tetranychus urticae Koch is one of the most damaging agricultural pests. The present study investigated the inhalation toxicity of essential oils from two species of angouze (Ferula assafoetida and F. persica) and one species of gerbera (Otostegia persica) against this mite as a single application, an equal proportion of a mixture of two types of angouze, and an equal ratio of two types of angouze and one type of golder. Several adult mites were placed on the leaf discs of the pinto bean. Each experiment was performed at six concentrations, with three repetitions for each concentration. Twenty adult ticks of the same age (24 hours) were used in this study. The experiment was conducted using a completely randomized design. The number of casualties was counted after 24 hours. The results of this study showed that the LC50 values for the essential oils of F. persica, F. assafoetida, and O. persica, a binary mixture of two species of angouze, and a ternary mixture of essential oils of two species of angouze and golder were 0.054 and 0.2, respectively. It was 0.407, 0.17, and 0.93 µl/L. The comparison of 50% lethal concentrations of essential oils and their mixtures showed that F. persica essential oil has significantly higher inhalation properties than other essential oils and their mixtures, and toxicity The mixtures were considerably less than the toxicity of each essential oil alone. Based on these comparisons, we determined that there was an antagonistic relationship between them.
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