Journal of Food, Agriculture and Environment

Effect of application method on the interaction between Beauveria bassiana and neem tree extract when combined for Thrips tabaci (Thysanoptera: Thripidae) control

Author(s):

Mohammad S. Al-mazraawi ^1*, Amal Al-Abbadi ¹, Mohamad A. Shatnawi ², Mazen Ateyyat ³

Recieved Date: 2009-02-13, Accepted Date: 2009-04-17

Abstract:

The combined effect of the entomopathogen Beauveria bassiana and the neem tree extract were evaluated against the onion thrips Thrips tabaci by two application approaches on potted tomato plants in a greenhouse. The first approach was a topical application of a mixture of the two control agents while the second was a topical application of B. bassiana and a drenching application of neem tree extract. In the mixture application, onion thrips adults treated with B. bassiana and sub-lethal doses of neem tree extracts exhibited greater mortalities than insects treated with the fungus alone but with no synergistic interaction. However, the two control agents interacted antagonistically when neem tree extract was used at full field application rate. In the topical of B. bassiana and drenching application of neem tree extract, the treated insects exhibited mortalities higher than using each control agent alone and the two control agents interacted synergistically at sub-lethal doses of the neem tree extract. These results indicate that the application method affected the interaction between B. bassiana and the neem tree extract because drenching neem tree extract while applying B. bassiana topically enhanced the efficacy of the entomopathogen. Furthermore, using sub-lethal doses of neem tree extract with B. bassiana improved the effectiveness of the control process while reducing the amount of insecticide used. Consequently, better insect control is achieved with minimal impact on the environment.

Keywords:

Beauveria bassiana, Thrips tabaci, neem, interaction, microbial control

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Journal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 2
Category: Environment
Pages: 869-873

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