Effects of feeding experience on the odour-condit ioned anemotaxes of Colorado potato beetles

ences are significantly different it must be concluded that a strong aphid presence causes relatively little increase in the overall amount of cell damage. The length of time that aphids were allowed to feed hardly affected the amount of damage but it is possible that over substantially longer periods, such as experienced by a crop plant in the field, damage could accumulate. There was a noticable amount of cell damage in tissue not subjected to aphid attack. It seems most likely that this results from fixation of the plant material but the possibility exists that cells are influenced by other biological agencies such as leaf senescence or fungal infection. We conclude that in the short term aphid probing and feeding will not inflict substantial damage to the plant photosynthetic machinery and there is little suggestion that longer term problems will develop.