Abstract
AbstractAn electrophysiological study of the sensilla styloconica of the galea in Choristoneura fumiferana Clem. (Lepidoptera: Tortricidae) larvae showed a differential response between fourth‐ and sixth‐instars to extracts of balsam fir foliage. Larvae raised on artificial diet were stimulated with the water soluble fraction of needle extracts obtained from terminal and lateral shoots of 30‐ and 70‐yr‐old balsam fir trees. An extract‐sensitive neuron was found in the lateral styloconic sensillum of both instars. The lateral styloconica in the fourth‐instar larvae were more sensitive to extracts from terminal than from lateral shoot foliage of both young and old trees. The lateral styloconica of sixth‐instar larvae were more sensitive to lateral shoot foliage of old trees. Results are discussed with respect to their relationship to feeding preferences and feeding rates observed in a previous behavioural study.
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