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Preliminary Study On The Combined Effect Of Mating Disruption And Inundative Releases Of Trichogramma Evanescens West. Against The Olive Moth, Prays Oleae Bern.
- 1E.M. Hegazi, 2E. Agamy, 3S. Hassan, 3A. Hertz, 4W. Khafagi, 4S. Showel, 4L. Abo-Abdala, 1A. Ziton, 1S. El-Said, 1A. El-Shazly, 1A. El-Menshawy, 1H. Karam, 1N. Khamis and 1S. El-Kemny
- (1) Faculty of Agriculture, Alexandria University, Egypt
- (2) Faculty of Agriculture, Cairo University, Egypt.
- (3) Institute for Biological Control, Darmstadt, Germany.
- (4) Plant Protection Research Institute, Sabahia, Alexandria, Egypt.
Abstract
Three comparable olive groves (3.1 ha, each) of the same olive varieties (Toffahi and Shamy) were chosen to study the combined effects of mating disruption and releases of the egg-parasitoid Trichogramma evanescens West. (Hymenoptera: Trichogrammatidae) on the olive moth, Prays oleae Bern. (Lepidoptera: Hyponomeutidae). Field releases of 900,000 wasps/ha/release were applied on olive trees against the anthophagous and carpophagous generations of the olive moth on plots at the first and second olive groves. In addition to Trichogramma releases at the plots of the first olive grove, mating disruption technique was performed against the carpophagous generation of the same pest. The third olive grove was left without treatments for comparison (control). Olive groves received both treatments characterized by lowest male catches in delta-wing traps, lowest weight of pre-mature fallen olive fruits and highest weight of fruit harvest/tree. No significant differences were detected between number of eggs/20 olive shoots/tree of trees treated only with Trichogramma and those treated with wasps and P. oleae pheromone together. However, the quality and quantity of the fruit harvest/tree were higher on trees received both treatments compared with the trees treated only with the wasps. Importantly, two different endemic Trichogramma species other than T. evanescens were collected during the present work. The new species will be mass-reared and tested during the next olive season. The outcome of the combined effect of inundative releases of egg wasps and mating disruption techniques was successful and could provide a model for the control of lepidopterous pests on olive trees.
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