Abstract
Two trap designs and eight formulations of potato tuberworm, Phthorimaea operculella (Zeller), sex pheromone, trans -4, cis -7-tridecadien-l-ol acetate (PTM 1) and PTM 1 + trans -4, cis -7, cis -10-tridecatrien-l-ol acetate (PTM 2) were tested in the field during 1982 in Lima, Peru. No significant differences ( P > 0.05) in trap capture were observed between the water pan trap at ground level and the funnel trap set at ground level and at 40 and 80 cm of elevation. All eight ratios of PTM 1 and PTM 2 tested were significantly superior to the use of virgin-female traps. Highest capture was obtained by using a 9:1 ratio of PTM 1 to PTM 2. Ratios of 1:1.5 and 3:1 were as effective as a 9:1 ratio of PTM 1 to PTM 2. PTM 1 alone had significantly lower captures than these ratios. The attractiveness of a 9:1 ratio appears to drop after 90 days of field use. The 1:1.5 ratio remained attractive for 90 days and beyond. Storage at −5°C for 2 months did not diminish the attractiveness of this pheromone blend.
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