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Assessment of the granulosis virus of Cydia pomonella L. (CpGV) as a tool to control the pea moth Cydia nigricana F. in grain peas

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In Germany pea moth (Cydia nigricana, Lepidoptera: Tortricidae) is a serious problem especially for organic vegetable peas. CpGV is a natural virus causing death in Cydia pomonella. The virus does not act by contact, but ingestion. Small scale field-tests with CpGV were conducted according to EPPO-guidelines with grain pea cv. "Santana" in a randomised block design in 4 replicates. At the time of egg hatching peas were sprayed with CpGV. Efficacy assessments were based on the percentage of damaged peas, the numbers of larvae per pod, larval stage and yield loss. In 2004 an UV-protection powder combined with CpGV was tried unsuccessfully. Even very high application rates of CpGV did not result in a significant reduction of pea moth larvae in the pods, rendering CpGV not useful for their control under the conditions tested.

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