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Antifeeding activities ofclerodin and chlordimeform in a topical application on the larval olfactory and various gustatory chemosensilla wcre studied. The morphological and histological characteristics of these chemosensilla of the tobacco cutworm are similar to those of other lepidopterous larvae. Clerodin produced antifeeding activity and slight excitation symptoms when it was applied to thc scnsilla basiconica of the apical segments of both maxillary palps, while chlordimeform produced antifeeding activity and extreme excitation symptoms when it was applicd to the hypopharynx. Chlordimeform's obvious excitatien syrnptorns were hyperactivity in locornotion with several rubbing trials of the mouth parts on the fiIter paper and biting trials to the thoracic lcgs, fo11owed by uncoordinated movements as a result of

applied entomology and zoology

Mode of Action of Antifeeding Compounds in the Larvae of the Tobacco Cutworm, Spodoptera litura (F.) (Lepidoptera : Noctuidae) III. Sensory Responses of the Larval Chemoreceptors to Chlordimeform and Clerodin