PHEROMONES OF IPS PINI (COLEOPTERA: SCOLYTIDAE). RESPONSE TO INTERPOPULATIONAL HYBRIDS AND RELATIVE ATTRACTIVENESS OF MALES BORING IN TWO HOST SPECIES

Publisher Website
Google Scholar
Abstract
Two types of field bioassays of the relative attractiveness of various pheromone sources to Ips pini were conducted at Wanakena, N.Y., and at Warrensburg, N.Y. In the first test, the numbers and sex ratios of beetles responding to boring males from New York, Idaho, and their F1 and backcross hybrids graded down in the order of "blood relationship." The intermediate attractiveness of hybrids indicates that hybrids produce pheromones of both parents. In the second test, New York males reared in white pine attracted greater numbers of beetles than those reared in red pine and beetles boring in white pine were more attractive than those boring in red pine.