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Dispersal and field progeny production of Trichogramma species released in an olive orchard in Egypt

Affiliation
Faculty of Agriculture, Alexandria University, Alexandria, Egypt
Hegazi, Esmat;
Affiliation
Plant Protection Research Institute, Sabahia, Alexandria, Egypt
Khafagi, Wedad;
GND
115662456
Affiliation
Julius Kühn-Institute (JKI), Institute for Biological Control, Germany
Herz, Annette;
Affiliation
Chemical Ecology and Natural Products Laboratory, NCSR ‘‘Demokritos’’, Attikis, Greece
Konstantopoulou, Maria;
GND
121116492
Affiliation
Julius Kühn-Institute (JKI), Institute for Biological Control, Germany
Hassan, Sherif Ali;
Affiliation
Faculty of Agriculture, Cairo University, Cairo, Egypt
Agamy, Essam;
Affiliation
Plant Protection Research Institute, Giza, Cairo, Egypt
Atwa, Atwa;
Affiliation
Plant Protection Research Institute, Sabahia, Alexandria, Egypt
Shweil, Sania

Dispersal ability and field progeny production of augmentative released biological control agents depend on ecological adaptations of the particular species or strains used. Four species of the egg parasitoid genus Trichogramma were compared aiming to select suitable candidates for control of lepidopteran olive pests. Three of them (T. bourarachae Pintureau and Babault, T. cordubensis Vargas and Cabello, T. euproctidis Girault) had been previously collected from olive groves, whereas the commercially available strain used (T. evanescens Westwood) was originally isolated from sugarcane fields. During five consecutive field releases in an olive orchard near Cairo, dispersal and/or progeny production of these species was monitored using sentinel eggs placed at different heights in the release tree canopies as well as in neighboring trees (“distance effect”). The cardinal direction of dispersal was random for T. euproctidis and T. evanescens. Significant higher parasitism occurred on sentinel eggs placed on the middle part of tree canopy and highest parasitism was observed in trees where wasps had been released. Field progeny production was highest for T. bourarachae, followed by T. euproctidis and T. cordubensis. T. evanescens propagated less under field conditions. Inter-tree dispersal of all species except T. bourarachae was limited and, for biological control, releasing material should therefore be distributed on each olive tree, preferably also at different levels of the canopy.

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