Table 1. Male/female sex ratios of catches of Pityogenes chalcographus and Ips typographus caught in funnel or entering pipe (total catches of 16-18 replicates in parentheses) during attraction to MD+CH (methyl decadienoate and chalcogran, pheromone components of P. chalcographus), MB+cV (methyl butenol and cis-verbenol, pheromone components of I. typographus, or various combinations (test C: 12 May - 14 June, tests D and E: 14-17 June 1986, Hillerod, Denmark). Descriptions of the pipe traps with funnel and chemical release rates are given in figure 3. | |||
Test ) Bait chemicals | Male/female sex ratio (n) Funnel |
Entering pipe | % Entering pine |
---|---|---|---|
P. chalcographus | |||
C) MD + CH | 0.68 (1022)***a | 0.68 (84) | 7.6*** |
C) MD + CH + MB + cV | 0.97 (1861) | 1.00 (538) | 22.4 |
D) MB + cV | 12.00 (26)** | 1.33 (7) | 21.4 |
D) MB + cV + 10 x MD | 1.23 (49) | 1.67 (24) | 32.9 |
E) MB + cV | 1.26 (436)*** | 1.33 (207)*** | 32.2** |
E) MB + cV + 10 x CH | 0.61 (2149) | 0.59 (762) | 26.2 |
Ips typographus | |||
C) MB + cV | 0.60 (391)*[***]b | 0.34 (295) | 43.0 |
C) MD + CH + MB + cV | 0.40 (225) | 0.24 (156) | 40.9 |
D) MB + cV | 0.81 (334)[***] | 0.31 (251) | 42.9 |
D) MB + cV + 10 x MD | 0.74 (236)[***] | 0.24 (148) | 38.5 |
E) MB + cV | 0.68 (374)[***] | 0.35 (295) | 44.0** |
E) MB + cV + 10 x CH | 0.63 (147)[**] | 0.24 (73) | 33.0 |
Table 2. Effect of (-)-verbenone on the attraction of Pityogenes chalcographus to their pheromone components MD+CH (methyl decadienoate plus chalcogran, chemicals released from a pair of sticky traps, 6 m apart, mechanically rotated at two rph31 during the afternoon; Hillerod, Denmark) | |||
Stiky trap catch | |||
---|---|---|---|
Bait chemicals | Males | Females | Total |
13 May 1988 | |||
C) MD + CH | 139 | 400 | 539 |
C) MD + CH | 160 | 422 | 582 |
17 May 1988 | |||
MD + CH + verbenone | 100a,b | 174b | 274b |
D) MD + CH | 165 | 409 | 574 |
JOHN A. BYERS Department of Animal Ecology, Lund University, SE-223 62 Lund, Sweden Present address: |
---|