Experimental Aerial Application of Insect Growth Regulators Against the Spruce Budworm, Choristoneura Fumiferana (Clemens) in Thessalon (1976) and Hearst (1977) – (1978)
- Retnakaran, Arthur
Forest Pest Management Institute, Sault Ste. Marie, Ontario - Kaupp, William
Forest Pest Management Institute, Sault Ste. Marie, Ontario - Howse, Gordon
Great Lakes Forest Research Centre, Sault Ste. Marie, Ontrio
Experimental aerial application of several Insect Growth Regulators against the spruce budworm at Thessalon (1976) and Hearst (1977) showed that -
Dimilin at 140 g/ha (2 oz./ acre) is ineffective with or without a sticker.
Dimilin when applied twice with an interval of 1 week between sprays at 140 and 70 g/ha (2 and 1 oz./ acre) caused 78.1% reduction in spruce budworm population and provides good foliage protection on white spruce. However, it is less effective on balsam fir.
RO - 103108, like other juvenile hormone analogs has marginal effects and does not merit further testing.
PH - 60-41, which is not a moult inhibitor even though it is an analog of Dimilin at 140 g/ha (2 oz./ acre) Caused 70.1% population reduction on both balsam fir and white spruce and warrants further study.
EL - 494 which is a moult inhibitor, at 140 g/ ha (2 oz. / acre) caused 60.1% reduction in population on both trees species and requires further testing.
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