Evaluation of the Efficacy of the Volk Oil and chlorpyrifos (EC 40.8%) on Aonidiella orientalis and Chilocorus bipustulatus

One of the important citrus pests in Jiroft region is Aonidiella orientalis, that cause extensive damage to some kinds of citrus trees annually. Therefore, it is essential to control the pest to prevent damage. In this study to evaluate the efficacy of chlorpyrifos insecticide alone and along with Volk oil, the experiment was carried out based on Randomized Complete Block Design (RCBD) with 5 treatments including chlorpyrifos (1.5 ml/L) and 3 concentrations of Volk oil (0.5, 1 and 1.5 %), and chlorpyrifos (1 ml/L Volk oil 1% in 4 replications in the year 2015. The toxicity of the treatments on Chilocorus bipustulatus lady bird was also checked. The pest population was counted one day before and 3, 7 and 14 days after the treatment. Percent efficacy was calculated using Henderson-Tilton method. The results show that, the most efficient treatment was chlorpyrifos with Volk oil on 1 st nymph of A. orientalis during all the days after spraying in the showing 50-68 % efficacy. The highest mortality which is 68.42% was observed 7 days after spraying with chlorpyrifos with Volk oil. The most effective treatment on adult was 3 days after spraying with chlorpyrifos along with Volk oil which 49.5%. According to IOBC grouping, the toxicity of the three Volk oil concentrations on larvae and adult ladybird were harmless and slightly harmful group during all the days after spraying. chlorpyrifos along with Volk oil and alone was moderately harmful on larvae of ladybird was ladybird 1 day after the treatment, slightly harmful and harmless 3 and 7 days after spraying. chlorpyrifos with Volk oil and alone were slightly harmful on adult ladybird after spraying. Based on the results, it is recommended to use chlorpyrifos along with Volk oil in rotation with Volk oil alone in the control of A. orientalis.