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Steam volatiles ol'freqj~ly cut hanana stem were analyzed lly comhined . gas cbromato~~apl~y- electroai~l;enno~apl~ic detection (GC-EAD) ailtl comhined gas cl~i~c~matograplly-niass spect~.ometry (GC-MS) to iclentifi n-hexan.ol, n-hcxanal, n-pentanol and cis-3-hexc?nol as host attractants for the banana stem borer, Cldotl~oi~c~s loir,qicollis. .Idcnlities of the ahovc compounds were confirmed 1,y comparalivc studies with aulhcntics. Female weevils responded sligl~tly mo1.c (:EAG 1.41k !).()I) t1:han male weevils (EAG 1.04 f 0.03) to tho steam distillate. Synthel;ic eclu~.valents of the ahove aktractant,~, were sul?iect;ed to EAG assay and 11-hexan0l elicitcd the l~iglicst EAG lesponse (0.39 k 0.02 mV)'in Ihc antelma clt' tllis weevil. The other synthetic at.Lractants, 11-hexanal, n-pentanol and cis-3-hexello1 elicited EAG responses in t.ba fi~llowing order; 0.15 mV, 0.10 mV, 0.0t) niV. Aniix(;u~.c ofthe ahovc synL11etic attraclants (SAM) also elicited a poor EAG response (0.2 nlV) in. O.loii,gicolli,<. In lield ,xpcljments n-hexanol singly o)..,in comhiuation with the agglogation phcromone o.TO, lorrgicollls Cailcd tc.) attract any weevils into traps. The synthetic nttractanl; mnix(;lli~e (SAM) also was not field nt.tractive while it,s combination wit11 lhe aggregation pl1er1)nlone of 0. loitgicollis was attractive wit,h a maximum rrleail catch of' ().(Xi k 0.21 weevils ILrapIweek. Undei the same contlitions, Ilowcvc~; thepest's known atlraclant system, the aggregation phcromone + banana stem tissue haited trap, 11ad a maximum mean catch of 29.16 + 7.02 weevils1 traplweek.

journal of the national science foundation of sri lanka/journal of the national science foundation

Host attractants for the banana stem borer, Odioporus longicollis (Coleoptera: Curculionidae): identification, electrophysiological activity and behavioural bioassay