Trials on the use of Trichogramma spp. to control the codling moth Cydia pomonella L. and the summer fruit tortrix moth Adoxophyes orana F.R

Hassan, S.A.

Mitteilungen der Deutschen Gesellschaft fur Allgemeine und Angewandte Entomologie 8(1-3): 70-74

1992


ISSN/ISBN: 0344-9084
Accession: 002725043

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Abstract
Field experiments to optimize the use of Trichogramma to control Cydia pomonella and Adoxophyes orana were conducted between 1988-90 in apple orchards in Germany. In 3 field experiments, a combination of the egg parasitoids Trichogramma dendrolimi and T. embryophagum gave an increased level of control by about 10% compared to the release of T. dendrolimi alone. Four releases, each at 2 500 000 parasites/ha, were conducted in each case. With the mixture of species, the reduction in damage caused by C. pomonella was 52.9, 84.3 and 74.1% compared to 42.0, 78.0 and 66.7% for the release of T. dendrolimi alone. Damage caused by A. orana was reduced by 39.2 and 85.4% when the mixture was used compared to 23.5 and 70.7% when only T. dendrolimi was released. Although the production of T. dendrolimi for commercial use was started in 1989, the treated area was still very limited. This was principally due to difficulty met by plant protection services to conduct model experiments to demonstrate the effectiveness of Trichogramma, and the limited market for the parasitoid - the price for production and distribution is still very high compared to chemical pesticides.