Journal of Food, Agriculture and Environment

Toxicity evaluation of abamectin against the date palm mite, Oligonychus afrasiaticus (McGregor) (Acari:Tetranychidae)

Author(s):

 Saleh S. Alhewairini ¹*, Mahmoud M. Al-Azzazy ^1,2

Recieved Date: 2018-09-28, Accepted Date: 2018-12-14

Abstract:

This study has provided important information regarding the toxicity of abamectin against the date palm mite, Oligonychus afrasiaticus (McGregor) including the eggs. Abamectin was moderately toxic to adults of O. afrasiaticus with lower toxicity to its eggs whereas abamectin with 1000 ppm of Huwa-San TR50 was more toxic to all developmental stages including eggs under laboratory conditions. Furthermore, Injo200 only increased the toxicity of abamectin to the adults of O. afrasiaticus. The mortality percentages of O. afrasiaticus were 36.66, 51.52 and 65.41% and 52.52, 62.16 and 75.36% and 70.26, 72.69 and 85.11% after one week of exposure to recommended dose (RD), half of the recommended dose (1/2RD) and one quarter of the recommended dose (1/4RD) of abamectin only and with Injo200 or 1000 ppm of Huwa-San TR50, respectively. A marked reduction in the number of larvae hatching from eggs was only seen after the application of abamectin with 1000 ppm of Huwa-San TR50. The percentages of larvae hatching from eggs of O. afrasiaticus were 96.42, 94.68 and 90.90% and 96.75, 95.20 and 93.40% and 55.75, 52.92 and 50.74% after one week of exposure to 1/4RD, 1/2RD and RD of abamectin only and with Injo200 or 1000 ppm of Huwa-San TR50, respectively. This study has proven that the toxicity of abamectin against O. afrasiaticus can be increased by the addition of Huwa-San TR50. The addition of 1000 ppm Huwa-San TR50 was found to be significant in increasing the toxicity of abamectin against all stages of O. afrasiaticus including eggs. These findings would be helpful in creating a new strategy for controlling O. afrasiaticus in terms of reducing costs, residual effects as well as side effects on beneficial insects and predatory mites.

Keywords:

Abamectin, Huwa-San TR50, mite,  Oligonychus afrasiaticus, date palm fruits

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Journal: Journal of Food, Agriculture and Environment
Year: 2019
Volume: 17
Issue: 1
Category: Agriculture
Pages: 30-35

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