Optimization of Orius majusculus release: photoperiodic sensitivity at different temperatures and storage of diapausing adults

Authors : Şerife Ünal BAHŞİ, İrfan TUNÇ

Pages : 935-941

Doi:10.3906/tar-1403-144

View : 20 | Download : 12

Publication Date : 2014-12-01

Article Type : Research Paper

Abstract :The photoperiodic sensitivity and storage of Orius majusculus insert ignore into journalissuearticles values(Reuter); from Antalya was investigated to obtain data for the optimization of its release. In the current study, it was not possible to induce a high insert ignore into journalissuearticles values(up to 100%); incidence of diapause unless all the nymphal instars and adults were successively exposed insert ignore into journalissuearticles values(i.e. full exposure); to a short day length insert ignore into journalissuearticles values(11.5 h); at constant temperatures of 18 and 26 °C, and fluctuating temperatures of 10/26 °C. Hence an intermittent exposure to long day lengths, even for short periods of time insert ignore into journalissuearticles values(only during instars IV–V or adult stage);, would avoid a high incidence of diapause at 10/26 °C and 26 °C. The response of O. majusculus nymphal instars and adults to a short day length with a low incidence of diapause under fluctuating temperatures suggests that greenhouses, where such temperatures prevail, provide an environment that is conducive to diapause prevention. The release of adults is a better approach than the release of nymphs, since the adults and their nymphs, until the eclosion of new adults, are expected to respond to short day lengths with a low incidence of diapause in greenhouses. When nymphs are released, on the other hand, a high incidence of diapause would be inevitable. Increasing the constant temperature to 30 °C at full exposure did not prevent diapause and consequently did not change the incidence of diapause. Storage of diapausing O. majusculus adults was possible for 1 month with a higher survival rate and fecundity than in a study based on the storage of nondiapausing adults at a lower temperature.
Keywords : Biological control, diapause, Frankliniella occidentalis, Orius majusculus, photoperiodic sensitivity, storage