Abstract

This study was carried out in order to determine the effect of the volatile oil of the Myrtle plant leaves (Myrtus communis L.) and Eucalyptus (Eucalyptus camaldulensis Dehnh.) with Concentrations 1, 2 ,3 µL / 100 ml from volatile oil for the two plants on the biological activities of the beetle cowpea Callosobruchus maculatus (Fab.), as well as to test the effectiveness of the volatile oil of the two plants with concentration 30 µL / liter to protect chickpea seeds from infestation for a period of 3 months. The results of exposure eggs of cowpea beetle to the volatile oil of Myrtle and Eucalyptus plants with different concentrations and incubation periods had shown a high effectiveness of oil in inhibition eggs hatching, They were 77.2% and 75.9% for Myrtle and Eucalyptus plants respectively, The results also indicated that exposing the adult to the volatile oil of Myrtle and Eucalyptus plants in different concentrations and periods of exposion (24,48,72 hours) had led to the die of adults so the die reached about 84.5% and 84.7% for Myrtle and Eucalyptus plants respectively and an increase in the mortality with increasing of concentration and duration of exposion, The highest mortality was 100% at the highest concentration of 3µL ̸ L after a 72 hour exposure , The exposure of adults to the volatile oil decrease in the average number of eggs laid by the exposure adult, so the average number of eggs laid seen to be 25.8 egg / 5 females and 26.4 egg / 5females after 72 hours of exposion period while about 80 egg ̸ 5 females in control treatment. As a results of testing, the efficiency of the volatile oil for Myrtle and Eucalyptus plant in concentrate of 30 µL ̸ L to protect chickpea seeds from infestation for 3 months. The results were shown a high efficiency to the volatile oil for both plants in providing significant protection for seeds from infestation for a period of three months where the infestation percentage had been decreased considerably. They were 0.67% and 1% for Myrtle and Eucalyptus plants respectively, while it was 50.11% in control treatment. The results were also indicated that the infestation percentage in the seeds had been increased by increasing the time of storage, but the increment is not significant in seeds exposed to Myrtle and Eucalyptus volatile oil, while in the seeds of the control treatment reaching the highest infestation percentages of 70% after 3 months of storage while it was 23.67 after a month of storage.

The article was added to IASJ on 2016-12-05

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