| УДК |
Аннотация: Field observations and objective data from "hidden-log" and other study situations, relating to attack flight behaviour of the ambrosia beetle, Trypodendron, lead to the conclusion that beetles are guided to attack by odours from logs. They indicate, also, that when searching for logs, beetles fly against the wind until they are near a source of attraction and then alight and continue their search by crawling. They suggest, furthermore, that stimuli different from those guiding beetles to logs are involved in initiation of burrowing activity. Attractiveness may differ markedly in logs similar in many other respects and may change greatly during a flight season; that of heavily attacked logs decreases while that of lightly- or non-attacked logs may remain low or increase considerably.
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