Infestation of gorse pods by Cydia ulicetana and Exapion ulicis in the South Island of New Zealand

Craig R. SixtusA, R. Roderic ScottA and George D. HillB
A Bio-Protection and Ecology Division, PO Box 84, Lincoln University, New Zealand.
B Agriculture and Life Sciences Division, PO Box 84, Lincoln University, New Zealand.


Summary

The effectiveness of Cydia ulicetana (Haworth) (gorse pod moth) and Exapion ulicis (Förster) (gorse seed weevil) at reducing annual production of gorse seed (Ulex europaeus L.) was compared at six sites over the South Island, New Zealand. The highest percentage (45%) of pods damaged by C. ulicetana was at East Takaka in May 2002, and E. ulicis, was most effective at Lake Ohau (76%) in January 2003. The percentage of damaged pods fluctuated. Although there were climatic differences among sites, they did not differ significantly in the proportion of gorse pods damaged by C. ulicetana. However, there was a significant seasonal difference (P <0.001) over all observations and C. ulicetana was responsible for damaging approximately 20% of gorse pods.

Key words: Gorse, Ulex europaeus, gorse pod moth, Cydia ulicetana, gorse seed weevil, Exapion ulicis, effectiveness.

 

Plant Protection Quarterly (2006) 21 (1) 39-42.