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


  • C. Appleton
  • B.A. Gresham



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 (lt;300 m 300600 m and gt;600 m above sea level) and three age classes (110 1120 and 2130 years old) Findings clearly show that although E californica populations vary markedly from one year to the next highest populations occurred in low altitude midaged P radiata in autumn Even at relatively high population levels in midaged 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




How to Cite

Appleton, C., and B.A. Gresham. “Monitoring &lt;i&gt;Essigella californica&lt;/i&gt; Populations in Bay of Plenty Forests”. New Zealand Plant Protection 56 (August 1, 2003): 45–50. Accessed August 20, 2022.




Most read articles by the same author(s)