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Essigella californica (Monterey pine aphid) populations were monitored in the Bay of Plenty forests of Rotoehu and Kaingaroa over two years to determine what influence E. californica has on the health of Pinus radiata, and to identify any associated predators and parasites. Populations were sampled throughout the canopy height of forests stands at three altitudinal ranges ( 600 m above sea level) and three age classes (1–10, 11–20 and 21–30 years old). Findings clearly show that although E. californica populations vary markedly from one year to the next, highest populations occurred in low altitude, mid-aged P. radiata in autumn. Even at relatively high population levels in mid-aged stands, E. californica did not appear to have any visible effect on tree health. The monitoring programme has shown that E. californica cannot be considered a pest of P. radiata in New Zealand.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Monitoring <i>Essigella californica</i> populations in Bay of Plenty forests