Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract Full Text

Use of Trichogramma ostriniae to control Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae) in sweet pepper in Québec, Canada.

Abstract

The efficacy of the parasitoid Trichogramma ostriniae was evaluated in 2009 and 2010 for the control of European corn borer (ECB, Ostrinia nubilalis) in sweet pepper in Québec. A strategy of four releases of 250 000 T. ostriniae per hectare including two cohorts per release was compared to a control treatment. Depending on the year and the release date, the trichogramma wasps released had emergence rates ranging from 79,0 to 87,0%; less than 5% of the trichogramma had atrophied wings and the number of female wasps was slightly higher than the male wasps. The percentage of egg masses which were totally parasitized was respectively 58,8% and 42,9% in 2009 and 2010. In the release plots, the percentage of fruits with ECB damage (5,7%) was significantly lower than the one in the control (9,7%) in 2009. This study demonstrates the potential of T. ostriniae to reduce the damage of ECB in field sweet pepper in Québec.