P. Jonsson et O. Anderbrant, WEATHER FACTORS INFLUENCING CATCH OF NEODIPRION-SERTIFER (HYMENOPTERA, DIPRIONIDAE) IN PHEROMONE TRAPS, Environmental entomology, 22(2), 1993, pp. 445-452
The variation in number of European pine sawflies, Neodiprion sertifer
(Geoffroy), caught in pheromone traps during 11 d of the peak flight
period was in part explained by the weather, measured by a weather sta
tion at the study site. Daily average air temperature was the most imp
ortant variable and was positively related to the log catch; it explai
ned 86% of the variation. A threshold for flight was determined to be
almost-equal-to +11-degrees-C. Rain during most of the day inhibited f
light, but occasional showers did not. Wind velocity and humidity did
not increase the explained part of the variation significantly in a mu
ltiple regression model after inclusion of air temperature. Trap simpl
e and weather-recording intervals <1 d did not enhance the correlation
s. An all-season study showed low correlation between catch and temper
ature because of varying background population and a considerable dist
ance to the meteorological stations where the temperature data were co
llected.