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Laboratory evaluation of sulfur bearing chemicals as attractants for larvae of the onion fly delia antiqua diptera anthomyiidae



Laboratory evaluation of sulfur bearing chemicals as attractants for larvae of the onion fly delia antiqua diptera anthomyiidae



Bulletin of Entomological Research 69(2): 291-298



A laboratory method was developed to evaluate the effectiveness of volatile sulfur-bearing chemicals as attractants for newly hatched larvae of D. antiqua (Mg.). The 27 chemicals evaluated included mono-, di- and trisulfides, mercaptans, thiosulphinates, thiosulphonates, thiopropanal S-oxide and onion oil (a complex misture of volatiles). Larvae were placed in the center of a petri dish and chemicals were presented either in glass tubes or on white absorbent discs 6 mm in diameter. One tube or disc contained 10,000, 1000, 100, 10, 1 or 0.1 nl of the test chemical; the other, a similar amount of diethyl ether. The solvent did not attract the larvae and was used to dispense 0.1-100 nl amounts of the test chemicals. Most of the chemicals tested were unattractive at 0.1 nl and repellent at 10,000 nl. At the intermediate amounts, all attracted at least 40% of the larvae and 13 attracted more than 80%. Onion oil at 1 nl and methyl trisulfide at 10 nl elicited the greatest response, attracting 95% of the larvae. A possible method is suggested for using these chemicals in the field to attract newly hatched larvae away from onion seedlings [Allium cepa].

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