ELECTROANTENNOGRAMS FROM SPRUCE BUDWORM MOTHS (CHORISTONEURA FUMIFERANA) (LEPIDOPTERA: TORTRICIDAE) OF DIFFERENT AGES AND FOR VARIOUS PHEROMONE CONCENTRATIONS

1979 ◽  
Vol 111 (7) ◽  
pp. 807-816 ◽  
Author(s):  
R.J. Ross ◽  
P. Palaniswamy ◽  
W.D. Seabrook
Keyword(s):  
Sex Pheromone ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Response Curves ◽  
Peak Response ◽  
Antennal Response ◽  
Pheromone Reception ◽  
Males And Females ◽  
Regular Increase ◽  
Source Concentration

AbstractAn electroantennogram (EAG) technique, which indicates electrochemical activity in a whole antenna, was used to study sex pheromone reception in spruce budworm moth antennae. For both males and females the EAG exhibited a phasic depolarization, reaching maximum near the end of a puff stimulation, followed immediately by repolarization which was prolonged by increasing amounts as the source concentration of the pheromone was increased. The dose–response curves for both sexes were sigmoid in shape, but they indicated that female antennae have a higher threshold and a lower peak response than that of males. Antennal response changed with age, being a regular increase and decrease for females and irregular for males.

scholarly journals Monitoring Spruce Budworm with Light Traps: The Effect of Trap Position

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Marc Rhainds ◽  
Edward G. Kettela
Keyword(s):  
New Brunswick ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Flight Period ◽  
Light Traps ◽  
Tree Canopies ◽  
Trap Location ◽  
Median Date ◽  
Males And Females ◽  
Highly Correlated

Daily records of adult spruce budworms,Choristoneura fumiferana(Clemens) (Lepidoptera: Tortricidae), captured at light traps at multiple locations in New Brunswick in the 1970s, are analyzed in relation to the physical position of light traps (tree canopies or forest clearings). Captures at light traps deployed in tree canopies were 4–400 times greater than those in forest clearings, especially for males. The phenology of captures (median date or duration of flight period) did not differ in relation to trap location. Captures of both males and females in tree canopies were highly correlated with egg densities, whereas no significant relationship was observed for either sex in forest clearings. Monitoring programs for spruce budworm adults using light traps should be standardized by deploying traps in tree canopies.

EFFECTS OF BLENDS OF SEX PHEROMONE ISOMERS ON MATING AND ELECTROANTENNOGRAMS OF SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)

1982 ◽  
Vol 114 (12) ◽  
pp. 1143-1149 ◽  
Author(s):  
R. J. Ross ◽  
W. D. Seabrook ◽  
G. C. Lonergan ◽  
P. Palaniswamy ◽  
B. Ponder
Keyword(s):  
Sex Pheromone ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
The Other ◽  
Conifer Forest ◽  
Male And Female ◽  
A Current ◽  
Female Laboratory

AbstractMale and female laboratory reared spruce budworm moths, Choristoneura fumiferana (Clem.), were placed in cages in a conifer forest, and the surrounding air permeated by each of four blends of the E and Z isomers of the sex pheromone (11-tetradecenal) at two concentrations. Mating suppression of 53–83% was found for each blend tested. At one concentration the four suppressions were similar, while at the other only one was significantly different. Electroantennograms (EAGs) were obtained from male moths for each of six E:Z blends at four concentrations. EAGs were similar for most blends at a given concentration, but tended to be larger than at a blend of 0E:100Z.These results were discussed using a current hypothesis on the ability of males to detect sex pheromone in air containing pockets of different isomeric blends.

NON-TARGET LEPIDOPTERA CAPTURED IN TRAPS BAITED WITH SPRUCE BUDWORM PHEROMONE IN ONTARIO

1993 ◽  
Vol 125 (6) ◽  
pp. 1067-1076
Author(s):  
C.J. Sanders
Keyword(s):  
Sex Pheromone ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Choristoneura Conflictana

AbstractTraps baited with a 95:5 blend of E:Z-11-tetradecenal, the sex pheromone of the spruce budworm, Choristoneura fumiferana (Clem.), were deployed throughout several summers in Ontario to determine what other Lepidoptera were captured that might be confused with the male C. fumiferana. Eight other species of Tortricidae were captured with sufficient frequency to suggest that they were attracted to the traps: Choristoneura conflictana Wlk. (the large aspen tortrix), six species of Acleris, and one Gretchena species. Of these, C. conflictana can easily be confused with C. fumiferana. The evidence suggests that male C. conflictana were not attracted by the pheromone, but blundered into the traps. They are very similar morphologically to male C. fumiferana, but can be differentiated with care.

LABORATORY BIOASSAY OF THE SEX PHEROMONE OF THE FEMALE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

1971 ◽  
Vol 103 (5) ◽  
pp. 631-637 ◽  
Author(s):  
C. J. Sanders
Keyword(s):  
Sex Pheromone ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Maximum Response ◽  
Continuous Illumination ◽  
Natural Lighting ◽  
Eastern Spruce Budworm ◽  
Minor Peak ◽  
A Minor ◽  
Number Of Males

AbstractA simple and inexpensive olfactometer based on that of Gaston and Shorey (1964) is described for bioassaying the sex pheromone of the eastern spruce budworm. The number of males buzzing (rapidly beating their wings while circling on the substrate) after the introduction of the sample into the airstream of the olfactometer was used as measure of response. Males held under continuous illumination showed maximum response when 2 to 3 days old. Under natural lighting males showed a circadian rhythm, with peak response shortly after dark and a minor peak in mid-morning. Since per cent response under continuous illumination exceeded the maximum response under natural lighting, it is recommended that bioassays be carried out with 2- to 3-day-old males held under continuous illumination.

EFFECT OF SUBLETHAL INFECTION LEVELS OF NOSEMA SP. ON THE PHEROMONE-MEDIATED BEHAVIOR OF THE WESTERN SPRUCE BUDWORM, CHORISTONEURA OCCIDENTALIS FREEMAN (LEPIDOPTERA: TORTRICIDAE)

1987 ◽  
Vol 119 (6) ◽  
pp. 587-594 ◽  
Author(s):  
J.D. Sweeney ◽  
J.A. McLean
Keyword(s):  
Sex Pheromone ◽  
Spruce Budworm ◽  
Choristoneura Occidentalis ◽  
Adult Males ◽  
Western Spruce Budworm ◽  
Infection Level ◽  
Microsporidian Parasite ◽  
Wing Fanning ◽  
Antennal Response ◽  
Synthetic Sex Pheromone

AbstractWestern spruce budworm, Choristoneura occidentalis Freeman, adult males were observed in a wind tunnel for their response to synthetic sex pheromone and subsequently examined to determine their degree of infection with a microsporidian parasite, Nosema sp. A subsample of C. occidentalis was randomly selected and electroantennograms (EAG) of individual moths were measured for response to pheromone. The Nosema infection level ranged from 0 to 21.8 × 106 spores per milligram and was significantly negatively correlated with the proportion of males wing-fanning, taking off, and flying upwind to contact the pheromone source. The level of Nosema infection and the amplitude of the antennal response (EAG) to pheromone were not significantly related. These results suggest that Nosema affects the response of C. occidentalis males to pheromone in some way other than directly reducing the sensitivity of the antennae. We hypothesize that sublethal infections of Nosema sp. may reduce mating success of the western spruce budworm in field populations.

CONTROLLED-RELEASE SEX PHEROMONE LURES FOR MONITORING SPRUCE BUDWORM POPULATIONS

1987 ◽  
Vol 119 (4) ◽  
pp. 305-313 ◽  
Author(s):  
C.J. Sanders ◽  
E.A. Meighen
Keyword(s):  
Controlled Release ◽  
Sex Pheromone ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Significant Loss ◽  
Hollow Fibers ◽  
Rate Data ◽  
Pheromone Components ◽  
Over Time ◽  
Capture Rates

AbstractFive formulations of the primary sex pheromone components of the spruce budworm (Choristoneura fumiferana [Clem.]) were evaluated as lures for monitoring spruce budworm populations: Biolures (Consep Membranes Inc.), Luretape plastic flakes (Hercon, Healthchem Corp.), polyethylene vials (International Pheromone Systems), hollow fibers (Albany International), and polyvinyl chloride (PVC) pellets. PVC pellets showed significant loss in attractiveness over the required 6-week period. Also, different batches of PVC pellets had very different rates of pheromone release and attraction; the oldest lures, stored for the longest period, were the most attractive. Luretape caught fewer moths than anticipated from the release-rate data and showed wide variation in catch among individual lures. Fibers were inconsistent. Biolures and polyethylene vials showed the lowest decline in attractiveness over time and the lowest variation in catch among individual lures, but their capture rates were higher than necessary.

BEHAVIOURAL EFFECTS OF SECONDARY COMPONENTS OF THE SEX PHEROMONE OF THE EASTERN SPRUCE BUDWORM, CHORISTONEURA FUMIFERANA (LEPIDOPTERA: TORTRICIDAE)

1983 ◽  
Vol 115 (9) ◽  
pp. 1053-1058 ◽  
Author(s):  
A. R. Alford ◽  
P. J. Silk ◽  
M. McClure ◽  
C. Gibson ◽  
J. Fitzpatrick
Keyword(s):  
Sex Pheromone ◽  
Wind Tunnel ◽  
Choristoneura Fumiferana ◽  
Spruce Budworm ◽  
Field Observations ◽  
Eastern Spruce Budworm ◽  
Behavioural Effects ◽  
Low Levels ◽  
Number Of Males

AbstractLaboratory wind tunnel and field observations have demonstrated an important behavioural role of tetradecanal (14:Ald) in the chemical communication system of the spruce budworm, Choristoneura fumiferana (Clemens). A greater number of males initiated upwind flight and continued on to contact the source when 14:Ald was present than with 95/5 E/Z11-tetradecenal (E/Z11-14:Ald) alone. The presence of E11-tetradecen-1-ol acetate (E11-14:Ac) decreased the males' responsiveness to the aldehydes. Its effect appeared to be attenuated, when present at low levels with 95/5 E/Z11-14:Ald, by the presence of 14:Ald, but it is still unclear what effects low levels of E11-14:Ac have on male behaviour.

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