CODLING MOTH (CYDIA-POMONELLA) - DISRUPTANTS OF SEX PHEROMONAL COMMUNICATION

In a small section of an apple orchard, six traps were placed each in control and test areas and baited with live virgin female codling moth s. Gray elastomer septa were used to dispense communication disruptant s around the traps. Dyed male codling moths were released in control a nd test areas, and the numbers of males captured in control and test t raps were compared. In 1991, linear regression curves of percent commu nication disruption versus logarithm of dose were obtained for three c ompositions: (E,E)-8,10-dodecadien-1-ol, codlemone (1); codlemone + do decan-1-ol + tetradecan-1-ol (2): and an equilibrium mixture of the fo ur isomers of 8,10-dodecadien-1-ol (30, (61% EE, 14% ZE, 20% EZ and 5% ZZ). All three regressions gave r(2) values greater than 0.90. At the 95% confidence limits, slopes and intercepts of compositions 1 and 2 were equivalent, and different from that of composition 3, which produ ced the greatest percentages of disruption at all doses. In 1992, five treatments were compared at a single dose: 1, 3, none (4), (Z,E)-8, 1 0-dodecadien-1-ol (5), (E,Z)-8,10-dodecadien-1-ol (6). Compositions 5 and 6 gave the greatest and similar percentages of disruption and were different from codlemone (1) and 4 (95% confidence), but not from com position 3. Communication disruption produced by composition 3 was gre ater than (codlemone), which was greater than 4.