Abstract
This paper reviews studies on adult Chrysomelid beetles which have provided insight into the role of phytochemicals as feeding attractants, stimulants, deterrents and host-recognition factors in general. Available evidence is discussed in the following major contexts: (1) attractants and distance recognition of host plants; (2) close range host-plant recognition; (3) concepts and mechanisms of feeding deterrents. Behavioural and sensory physiological data are emphasized, and the extent to which these can be correlated are discussed. Comparisons among closely related species are made whenever possible in order to explore the subtle differences in chemosensitivity which may underlie major differences in host-plant relationships which are known to exist. Six genera have received the greatest attention in the literature and data on them are discussed in some detail. These genera are Leptinotarsa, Chrysolina, Entomoscelis, Diabrotica, Galerucella, Phyllotreta. It is clear from the data available that the chemical and the chemosensory basis of host-plant recognition, in general, is complex. Details underlying recognition and non-recognition will be pursued most fruitfully using a few model species for which we have a reasonable amount of basic sensory information. Chrysomelid beetles provide excellent models for future studies in this field.
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