Nonanol, a Codling Moth Ovipositional Repellant, 1990

An infestation cage (35 cm wide × 50 cm long × 27 cm high) constructed of fiberglass screen over a wood frame was used to determine the acceptability of volatile plum compounds to CM oviposition. One end of the cage was covered with foam board that had 2 test holes (7 cm diam) across the width. A cylinder made from a plastic cup (4 cm high) that had the bottom removed was placed into each hole. The holes were covered with perforated waxed paper on the inside of the cage. Each test compound was dispensed on a 2.5 cm diam filter paper and placed in a randomly selected cylinder in front of a hole. The other hole was used for the control. One concentration of one test compound was tested in each cage. Each test was replicated 4 times using one cage/test. An air current from an oscillating 30.5 cm household fan was passed through the test holes into the interior of the cage to deliver an air flow pulse of 0.1 m/s every 5 s. About 170-240, 3- to 6-d-old CM adults in each cage were allowed to oviposit on the perforated waxed paper over each hole for 24 h. The acceptability of the test compound was determined by the no. of CM eggs laid over the test compound hole compared to the no. of eggs laid over the untreated control hole in the same cage. About 400 CM adults were placed in a glove box (70 wide × 50 long × 45 cm high) to study ovipositional behavior on 15 'Goldcrest' peach shoots and 15 plum shoots that had 4 - 16 leaves and one 2 - 5 cm diam fruit per shoot. The total no. of eggs and larvae were counted on the fruit and on the upper and lower leaf surfaces after 7 d in the glove box.