Effects of temperature on the host preference of pine processionary caterpillar Thaumetopoea wilkinsoni Tams, 1924 (Lepidoptera: Notodontidae)

The work reported here analyzes the effects of temperature on host consumption and preference of eastern pine processionary caterpillar Th aumetopoea wilkinsoni (Lepidoptera: Notodontidae). Nest censuses were taken in the fi eld and food choice tests were conducted in the laboratory. Two pine species (Pinus nigra and P. brutia) were considered. Caterpillars hatched on both pine species were collected and included in experiments that were conducted under 4 different temperature regimes (15, 20, 25, and 30 °C). Needles of both pine species were off ered as food. Results showed that increasing the temperature caused an increase in the feeding amount of the caterpillars and also a blurring eff ect on preference. Early instar diet was found to have effects on late instar diet.