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SCOT capillary Chromatographic and SCOT capillary chromatographic-mass spectrometic analyses of gland washes and effluvia of virgin femaleChoristoneura occidentalis Free, have been conducted with both a diapausing and nondiapausing strain of this insect. The following compounds were identified in gland washes and effluvia in both strains:E andZ11-14∶Ald,E andZ11-14∶Ac,E andZ11-14∶OH and 14∶Ald, 14∶Ac, and 14∶OH. The average aldehyde: acetate: alcohol ratio found by analysis of single glands by virgin females (nondiapausing strain) was 1∶7∶0.73. Analysis of virgin female effluvia gave this ratio as 10∶3∶8 (diapausing strain: %Z=8, 11, 15, respectively) and 10∶3∶6 (nondiapausing strain: %Z=8, 11, 12, respectively). The saturated components were generally 1-2% of theE isomer in each case. Comparisons of EAG responses of bothC. occidentalis andC. fumiferana toE11-14∶Ald,E11-14∶Ac andE11-14∶OH were made. Correlations with both laboratory and field data previously published were also made betweenC. fumiferana andC. occidentalis.

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OH-target drijl and deposition of aerially applied deltamethrin sprays in an agricultural situation were determined using stainless steel (20 x 40 cm) ground deposit samplers and 'Rotorods'. Off-target spray deposition decreased exponentially with distance in situations where applications were made in winds with speeds equal to, or just above, maximum label limits for aerial application (8 km h-'). The results are compared with those of previous studies. The effectiveness of a 100-m 'no spray' bufSer zone in reducing offarget deposit is evaluated.