著者

高田 亘啓

出版者

日本生態学会

雑誌

日本生態学会誌 (ISSN:00215007)

巻号頁・発行日

vol.4, no.4, pp.145-148, 1955-03-31

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The present paper states the results of some observations on the function of the biotic factor to daily infestation of A. femoralis. (1) During night they rest quietly on the under sides of leaves of various tall plants standing by the feeding place. Their nocturnal resting place seems to be selected by their negative geotaxis. Therefore, as the crops such as cucumber grow taller, the number of insects remaining throughout night at the diurnal feeding place become larger. The dietary crops such as pumpkin which are trained to creep on the ground seem to have no value for this insect as a nocturnal resting place. (2) The values of dietary crops as food varies by species and growing stages. (3) Because various dietary crops have different values as food or as nocturnal resting place for A. femoralis, the pattern of the daily rhythmic activity of infestation exhibited in some crop fields is easily modified when other species of crops are cultivated in the adjoining furrows.