Abstract:
:The onion fly Delia antiqua is a specialist herbivore attacking only onions and closely related Allium species. n-Dipropyl disulfide (Pr2S2) has long been known to be attractive to onion flies in the laboratory and in the field. However, the insect's response is highly variable. Using behavioral bioassays we found that Pr2S2 was highly attractive to gravid, mated female onion flies,but did not stimulate oviposition. The response of female onion flies was concentration dependent. The physiological state of the flies (i.e., age, mating status, egg load/oviposition experience) also affected their responsiveness. The response of both sexes of onion flies varied with age, but females were always more strongly attracted than males. Responsiveness of females increased during the first 10 days after emergence. It stayed at a high level until 21 days after which the experiment was terminated. The responsiveness of males reached a maximum at 6-7 days after which it declined. Mated, gravid females responded more strongly to Pr2S2 than unmated, gravid females. Females deprived of the opportunity to oviposit were more attracted compared to females that had oviposited on cut onions prior to the experiment. Electroantennograms (EAG) of females revealed a higher response to stimulation compared to males. The EAG-response of females was not affected by mating status.
journal_name
J Chem Ecoljournal_title
Journal of chemical ecologyauthors
Romeis J,Ebbinghaus D,Scherkenbeck Jdoi
10.1023/a:1025642703888keywords:
subject
Has Abstractpub_date
2003-09-01 00:00:00pages
2131-42issue
9eissn
0098-0331issn
1573-1561journal_volume
29pub_type
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