Testing several species of Trichogramma to control the codling moth Cydia pomonella L. and the summer fruit tortrix moth Adoxophyes orana F.R. (Lep., Tortricidae)

Hassan, S.A.; Kohler, E.; Rost, W.M.

Nachrichtenblatt des Deutschen Pflanzenschutzdienstes 40(5): 71-75

1988


Accession: 001964925

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Abstract
The effectiveness of Trichogramma dendrolimi, T. embryophagum and Trichogramma spp. strains 45 and 48 as biological control agents against Cydia pomonella and Adoxophyes orana was tested in 7 field trials on apples in the German Federal Republic in 1984-87. Four to 6 treatments with the parasitoids (depending on the temperature) each at 9000 parasitoids/tree were carried out between June and September, to ensure the continuous presence of the natural enemies in the plots. T. dendrolimi reduced damage to the fruits by 61.2% for C. pomonella and 57.8% for A. orana. The corresponding reductions were 43.0 and 28.9% for T. embryophagum, 41.6 and 87.9% for Trichogramma sp. strain 45, and 38.8 and 34.4% for strain 48. The mass rearing of T. dendrolimi strain 22 for use against the tortricids in apple orchards is recommended.