The Efficacy of The Integration of Plant Extracts, Chemical Pesticides and Releasing The predator Phytoseiulus  persimilis A-H in Controlling The Population of Tetranychus urticae K on Tomato in The Greenhouse Conditions

Ibrahim Aziz Saqr(1) Magedah Mohammad Mofleh(2) and Randa Suleman*(1)

(1). Plant Protection Department, Faculty of Agriculture, Tishreen University, Latakia. Syria.

(2). General Commission of Agricultural Scientific Research (GCSAR), Damascus, Syria.

(*Corresponding author: Eng. Randa Suleman. E-Mail:

Received: 18/05/2018                                Accepted: 05/06/2018


The research was conducted in order to assess the efficacy of the integration between the use of the aqueous extracts of both Melia azedarach L. and Styrax officinalis L. and the pesticides Acetamiprid, Abamectin and Pyridaben and releasing the predator Phytoseiulus persimilis Athias-Henriot in controlling the population of Tetranychus urticae Koch on tomato Lycopersicum esculentum under the greenhouse conditions. Results showed that both extracts M. azedarach L. and S. officinalis  L. have an effect reached to 50.99 % and 40.29 %, respectively after 24 hours of the experiment with no significant difference between them. The efficacy increased to 77.19 % and 70.18 %, respectively in the fourth week after releasing the predator Ph. persimilis with a significant difference. The acaricide Pyridaben surpassed the Abamectin where the efficacy recorded 63.13 and 62.07%, respectively after 24 hours of the experiment but with no significant difference. The predator Ph. persimilis was able to generate a population that was able to control the population of T. urticae with integration of Abamectin in the fourth week of the experiment after releasing the predator. The efficacy recorded 86.03%, it had the highest effect comparing to the other treatments with a significant difference except with the Pyridaben treatment.

Key words: Plant extracts, Chemical pesticides, Tetranychus urticae, Phytoseiulus persimilis, Lycopersicum esculentum, syria.

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