scholarly journals Male Scent Emitted by Armyworms, Pseudaletia unipuncta and P. separata (Lepidoptera : Noctuidae)

1980 ◽  
Vol 15 (3) ◽  
pp. 310-315 ◽  
Author(s):  
Kazuo HIRAI
1988 ◽  
Vol 120 (S146) ◽  
pp. 131-151 ◽  
Author(s):  
Sheila M. Fitzpatrick ◽  
Jeremy N. McNeil

AbstractPseudaletia unipuncta (Haw.) males, experimentally deprived of hairpencils (male-specific scent organs), were less acceptable to females than were intact males. The degree to which females discriminated against males lacking hairpencils depended on the experimental protocol. When females were placed with males before scotophase onset, they tended to evade repeatedly and/or terminate genital contact with hairpencil-less males before eventually copulating, although this tendency was not statistically significant. When males were introduced after females had initiated calling, females refused hairpencil-less males significantly more often than intact ones. The incidence of copulation by hairpencil-less males was also lower than that of intact males, significantly so in one of the two populations tested. Neither copulation duration nor the dimensions of the cuticular portion of the spermatophore were correlated with the presence of hairpencils. Yet in all cases, females that mated with hairpencil-less males were more fecund and laid more fertile eggs than those mated to intact males. Hairpencil eversion could not be seen during courtship, nor did females show any obvious change in calling behaviour in response to scent from a freshly excised hairpencil. However, gas chromatographic analysis of hairpencils showed a decrease in titre of two scent components, acetic acid and benzaldehyde, just before the moment of genital contact between male and female, indicating that the pheromone was released at this time. These results suggest that P. unipuncta male pheromone facilitates female acceptance of males. The hypothesis that male pheromone carries information about the quality of a courting male is discussed in relation to recent work on arctiids, nymphalids, pierids and pyralids. An appendix of lepidopteran species possessing male scent structures is included.


1980 ◽  
Vol 6 (3) ◽  
pp. 565-572 ◽  
Author(s):  
L. M. McDonough ◽  
J. A. Kamm ◽  
B. A. Bierl-Leonhardt

2008 ◽  
pp. 294-297
Author(s):  
George Hangay ◽  
Severiano F. Gayubo ◽  
Marjorie A. Hoy ◽  
Marta Goula ◽  
Allen Sanborn ◽  
...  

1993 ◽  
Vol 28 (4) ◽  
pp. 376-386 ◽  
Author(s):  
D. C. Steinkraus ◽  
A. J. Mueller ◽  
R. A. Humber

An epizootic caused by Furia virescens (Thaxter) Humber (Zygomycetes: Entomophthorales) was studied in a population of armyworms, Pseudaletia unipuncta (Haworth), in a tall fescue, Festuca arundinacea Schreber (Poaceae), pasture in Arkansas. Prevalence rates in live larvae collected from the field were 21.6, 8.1 and 13.5% for F. virescens, the braconid parasitoid Glyptapanteles militaris (Walsh), and an unidentified mermithid nematode, respectively. In a laboratory trial one Heliothis virescens (F.) larva was infected by F. virescens. Previously unrecorded aspects of the morphology and life cycle of F. virescens are described. Pseudaletia unipuncta and H. virescens are new host records for F. virescens.


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