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Modifying effects of (Z)-5-decenyl acetate, an attraction-inhibitor of maleC. laricella, were studied at different levels of the pheromonal behavioral sequence. When blended with the attractant alcohol (Z)-5-decen-1-ol, 0.001% acetate significantly reduced and 1% almost abolished orientation flights followed by landing at the source. By contrast, 1000% of the acetate placed 5 cm apart did not suppress orientation flights to the alcohol source. Differential modifying effects of the acetate in blends vs. separate sources also occurred with respect to orientation flight duration, landing position, close-range behavior at the source, and the rate of unsuccessful orientation attempts. Our findings support the view that, inC. laricella, pheromonal inhibition results from simultaneous (as opposed to intermittent) perception of attractant and inhibitor. The various effects of the inhibitory acetate observed in the wind tunnel compare to results of earlier field observations.

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Forstliche Versuchs-und Forschungsanstalt B a d en -W ü rt tem berg, D-7801 Stegen-W ittental Sex Pherom one, (Z ,£ )-5 ,7 -D o d ec ad ie n al, P h ero m o n e In hibitors, Olfactory Receptors, D endrolim us pini, L asiocam pidae The principal com ponent o f the fem ale sex p h e ro m o n e of the E uropean pine m oth Dendrolimus p in i L. (L asiocam pidae) was identified as (Z ,E )-5 ,7 -dodecadienal by capillary gas chrom atography, m ass spectrom etry, single receptor analyses, and field trap p in g tests. T rap s initially baited with 1000 ng o f (Z ,£ )-5 ,7 -d o d e c ad ien a l (> 9 9 % Z E ) effectively m onitored low D. p in i p o p u latio n s over 6 weeks w ithout rebaiting. C aptures d isa p p ea red upon addition o f ^ 1% o f either (£ ,Z )-5 ,7 -d o d e c ad ien a l or (Z ,£)-5,7-dodecadienyl acetate, the key stim u la n ts for additional receptor cell types located in m ale an ten n al h a ir sensilla. The Forest Services o f central E uropean coun tries w ith stands o f Scots pine (Pinus sylvestris L.) en dangered by the feeding o f Panolis flam m ea Schiff. (Noctuidae), Lymantria monacha L. (L ym antriidae), Dendrolimus pini L. (L asiocam pidae) and Bupalus piniarius L. (G eom etridae), are req u ired by law to survey for population densities o f these lepidopterous pests. Bogenschütz [1,2] has em phasized th e p o te n tial o f traps baited w ith sex-attractant chem icals for early detection o f population increases am ong low (non-dam aging) populations o f P. flam m ea and L. monacha. We report here the id en tificatio n o f the prim ary sex pherom one com ponent p ro d u ced by the female European pine m oth, Dendrolimus pin i L. We also describe a synthetic chem ical fo rm u latio n suitable for use in population m onitoring o f this species by survey traps. Fem ale sex pherom one com ponents are c h e m i cally known for four species o f the fam ily L asioReprint requests to E. Priesner or M. D. C hisholm . 0341-0382/84/1100-1192 $ 0 1 .3 0 /0 cam pidae. The tent caterpillars Malacosoma disstria Hbn. and M. californicum Pack, produce sex p heromones whose principal com ponents are (Z ,£ )-5 ,7 -dodecadienal ( Z 5 ,£ 7 -1 2 ;A id) and (£ ,Z )-5 ,7 -d o d e cadienal (£ 5 ,Z 7 -1 2 : Aid) [3, 4], T he sex p h ero m o n e o f the Japanese pine m oth Dendrolimus spectabilis Butl. was reported as (Z ,£ )-5 ,7 -d o d e c a d ie n -l-o l (Z 5 ,£ 7 -1 2 : O H ) [5, 6], and th at o f the M asson pine m oth D. punctatus Wlk., as a co m b in atio n o f this alcohol with the corresponding acetate and p ro p io n ate [7, 8].All four geom etrical isom ers o f the 5,7-dodecadien-l-ols and their acetate and ald ehyde a n a logues were included in o u r study o f the D. pini pherom one. The 5,7-dodecadienes were synthesized and purified by W ittig condensation reactions previously described [9,10]. T he purity o f all final products was b etter th an 98%; the Z 5 ,£ 7 -1 2 :A ld had a purity o f b etter th an 99%.N erve im pulse responses o f single recep to r cells located in h air sensilla (S. trichodea) ...