Efficacy of a hydroxytyrosol-rich preparation from olive mill wastewater for control of olive psyllid, Euphyllura olivina, infestations |
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Authors: | Ali Debo Thabèt Yangui Abdelhafidh Dhouib Moheiddine Ksantini Sami Sayadi |
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Institution: | aUnité de Recherche Protection des Plantes Cultivées et Environnement, Institut de l’Olivier de Sfax, 3003 Sfax, Tunisia;bLaboratoire des Bioprocédés Environnementaux, Pôle d’Excellence Régionale AUF, (PER-LBPE) Centre de Biotechnologie de Sfax, BP “1177”, 3018 Sfax, Tunisia |
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Abstract: | Olive mill wastewater (OMW) is a problematic by-product in Mediterranean countries. Despite this, it is a raw material that is an unfailing source of bioactive molecules. A hydroxytyrosol-rich preparation (HRP) (49.6% weight:dry weight) was extracted from fresh OMW using a hydrolysis and post-hydrolysis purification process. The field efficacy of HRP as a spray treatment (2500 l ha−1) against olive psyllid, Euphyllura olivina (Hemiptera: Psyllidae), was evaluated in 2008 and 2009 in a drip-irrigated olive orchard.The HRP showed strong insecticidal activity against E. olivina at a concentration of 2 g l−1 hydroxytyrosol. Application of HRP resulted in 41.1 and 72.1% control of nymphs and adults, respectively. However, HRP application did not reduce egg hatch. Neither phytotoxicity nor toxicity to auxiliary-fauna was recorded with concentrations of 1.25 g l−1 or 2 g l−1 HRP. But, the 2.5 g l−1 concentration was slightly phytotoxic, especially at the E and F floral phenological stages of the grapes. HRP offers a natural and effective extract for control of olive psyllid and opens a new opportunity for the reuse of OMW. |
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Keywords: | Olive mill wastewater Hydroxytyrosol Euphyllura olivina Liothrips oleae Phytotoxicity Fauna auxiliary |
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