Study of ultrasonic waves influence on spodoptera littoralis biology

Abstract EN

Chemical pesticides used as a quick solution for insects control.

However, these pesticides lead to environmental pollution and residues on plants that reduce their safety and exporting chances, as well as the consequences of wrong use such as non-compliance with the recommended concentrations or following spraying precautions.

Additionally, draft and run off problems in soil, water and neighboring crops which may meet it’s harvesting time.

So, this research aims to use and test ultrasonic technology as an environmentally friendly and cost-effective method that can be integrated without conflict with the integrated pest control chain for human safety, safe environment and agricultural exports flourish.

This work proposed to study the influence of ultrasonic sound based technology on activity of Spodoptera littoralis insects.

The experiment was conducted at Faculty of Agriculture, Zagazig University, Sharkia Governorate, Egypt.

The experimental procedure started by ultrasonic generator testing under spectrums range of 5 to 12.5 kHz which simulated the human ear for distances range of 2.5 to 40 m.

The insects were divided to two groups: the first group was treated by ultrasonic waves for 3, 6 and 9 hours; the second group was the control treatment.

The effect of ultrasonic on the insects was evaluated by continuously noticing their activity, movement and feeding.

The obtained results showed that, the maximum reduction percentages of feeding rate were 57.5, 51.1 and 51.5% for instars of 4, 5 and 6, respectively.

By continued observation, it is observed that, the insects gathered in a form of groups away from the feeding leaves.

The T-test statistical analysis showed high significant effect of using ultrasonic waves on activity of insects.

So, it is recommended to use ultrasonic as a safe and environmental method for insect control.