The effect of photoperiod on the calling behaviour of virgin females of the true armyworm, Pseudaletia unipuncta (Haw.) (Lepidoptera: Noctuidae)

1986 ◽  
Vol 32 (3) ◽  
pp. 199-206 ◽  
Author(s):  
Johanne Delisle ◽  
Jeremy N. McNeil
Keyword(s):  
Pseudaletia Unipuncta ◽  
Calling Behaviour ◽  
True Armyworm ◽  
Lepidoptera Noctuidae

Survival and Development of the True Armyworm Pseudaletia unipuncta (Haworth) (Lepidoptera: Noctuidae), on Endophyte-infected and Endophyte-free Tall Fescue

1993 ◽  
Vol 28 (4) ◽  
pp. 462-467 ◽  
Author(s):  
Herbert Eichenseer ◽  
Douglas L. Dahlman
Keyword(s):  
Tall Fescue ◽  
Survival Rates ◽  
Acremonium Coenophialum ◽  
Pseudaletia Unipuncta ◽  
Symbiotic Fungus ◽  
Lepidopteran Larvae ◽  
Endophyte Infection ◽  
Survival And Development ◽  
True Armyworm ◽  
Lepidoptera Noctuidae

True armyworms, Pseudaletia unipuncta (Haworth), were fed tall fescue leaves either infected or uninfected with the symbiotic fungus, Acremonium coenophialum Morgan-Jones and Gams. Young larvae fed endophyte-infected leaves weighed less than cohorts fed endophyte-free leaves, but developmental and survival rates were unaffected by endophyte infection. Older instar larvae fed endophyte-infected leaves weighed the same as those larvae fed endophyte-free leaves. Pupal weights also were unaffected by endophyte infection. These results were similar to recent studies conducted with other armyworm species and suggest that endophyte infection in tall fescue does not enhance resistance to a number of lepidopteran larvae.

Impact of True Armyworm (Lepidoptera: Noctuidae) Feeding on Wheat Yields in Arkansas

2003 ◽  
Vol 38 (3) ◽  
pp. 431-438 ◽  
Author(s):  
Donald C. Steinkraus ◽  
Arthur J. Mueller
Keyword(s):  
Leaf Area ◽  
Pseudaletia Unipuncta ◽  
Wheat Field ◽  
Leaf Consumption ◽  
Wheat Leaf ◽  
True Armyworm ◽  
Field Plots ◽  
Lepidoptera Noctuidae

Wheat leaf consumption by the true armyworm, Pseudaletia unipuncta Haworth, was determined in the laboratory in 1993, 1994, and 1995. Total mean wheat leaf area consumed per larva from eclosion to pupation varied significantly from year to year (77.4–135.4 cm2) with an overall mean leaf area consumed of 103.2 cm2. Wheat field plots were infested with third-instar armyworms and allowed to consume wheat foliage at boot and anthesis stages until preset defoliation levels were met (0, 10, 25, and 50% defoliation in 1993, and 0, 35, 50, 65, and 75% defoliation in 1994, and 0, 35, 50, 65, and 75% defoliation in 1995, and 1996). Overall, no significant differences were seen between treatments in number of heads or mean weight of seeds per head in any year suggesting that at boot and anthesis stages Arkansas wheat can sustain up to 75% defoliation by armyworms with little loss in yield. Even at population levels that resulted in 75% defoliation head cutting was negligible.

MALE SCENT IN LEPIDOPTERAN COMMUNICATION: THE ROLE OF MALE PHEROMONE IN MATING BEHAVIOUR OF PSEUDALETIA UNIPUNCTA (HAW.) (LEPIDOPTERA: NOCTUIDAE)

1988 ◽  
Vol 120 (S146) ◽  
pp. 131-151 ◽  
Author(s):  
Sheila M. Fitzpatrick ◽  
Jeremy N. McNeil
Keyword(s):  
Mating Behaviour ◽  
Male Pheromone ◽  
Pseudaletia Unipuncta ◽  
Calling Behaviour ◽  
Male Scent ◽  
The Moment ◽  
Male Specific ◽  
Lepidoptera Noctuidae

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.

THE OVERWINTERING POTENTIAL OF TRUE ARMYWORM, PSEUDALETIA UNIPUNCTA (LEPIDOPTERA: NOCTUIDAE), POPULATIONS IN QUEBEC

1984 ◽  
Vol 116 (12) ◽  
pp. 1647-1652 ◽  
Author(s):  
Paul G. Fields ◽  
Jeremy N. McNeil
Keyword(s):  
Seasonal Changes ◽  
Developmental Stages ◽  
Supercooling Point ◽  
Pseudaletia Unipuncta ◽  
Freeze Tolerant ◽  
True Armyworm ◽  
Lepidoptera Noctuidae

AbstractThe true armyworm, Pseudaletia unipuncta (Haw.), has no evident diapausing stage, is not freeze tolerant, shows no consistent seasonal changes in either supercooling-point values or longevity at 0 °C for different developmental stages, and did not survive when held in overwintering cages in the field. These facts support the hypothesis that this species cannot overwinter in Quebec and that the adult populations observed each spring must therefore be the result of a northerly migration from sites, such as Tennessee, where overwintering is known to occur.

Differentiation and gene flow among island and mainland populations of the true armyworm, Pseudaletia unipuncta (Haworth) (Lepidoptera: Noctuidae)

2003 ◽  
Vol 81 (8) ◽  
pp. 1367-1377 ◽  
Author(s):  
V Vieira ◽  
B Pintureau ◽  
J Tavares ◽  
J N McNeil
Keyword(s):  
Gene Flow ◽  
Polyacrylamide Gel Electrophoresis ◽  
Aldehyde Oxidase ◽  
Pseudaletia Unipuncta ◽  
Island Populations ◽  
The North ◽  
Enzyme Systems ◽  
True Armyworm ◽  
Santa Maria ◽  
Lepidoptera Noctuidae

The genetic structure of populations of the true armyworm, Pseudaletia unipuncta (Haworth) (Lepidoptera: Noctuidae), in the Azores archipelago was studied using polyacrylamide-gel electrophoresis. Four enzyme systems (aldehyde oxidase, esterase, phosphoglucomutase, and phosphoglucose isomerase) were examined in six populations from islands in the Azores (Santa Maria, São Miguel, Terceira, Pico, Faial, Flores) and compared with those from populations from mainland Portugal and Canada. The North American and European populations are not clearly separated from the Azorean ones. Similarly, studies of different enzyme systems (aldehyde oxidase, esterase, malic enzyme, sorbitol dehydrogenase, manose-6-phosphate isomerase, and phosphoglucomutase) over 2 years (1997 and 1998) at different times of the year (spring, summer, and autumn) and at three different altitudes (0, 250, and 500 m above sea level) on three different islands (Santa Maria, São Miguel, and Faial) uncovered no distinct differences. These results, obtained from classically used loci, suggest that there is still some gene flow between sites or that island populations have not been isolated for sufficient time to have diverged from founder populations.

scholarly journals Armyworm, Pseudaletia unipuncta (Haworth) (Insecta: Lepidoptera: Noctuidae)

EDIS ◽  
2007 ◽  
Vol 2007 (6) ◽  
Author(s):  
John L. Capinera
Keyword(s):  
North America ◽  
Rocky Mountains ◽  
Pseudaletia Unipuncta ◽  
Fact Sheet ◽  
Grain Crops ◽  
Mythimna Unipuncta ◽  
True Armyworm ◽  
High Level ◽  
Lepidoptera Noctuidae

EENY-394, a 5-page illustrated fact sheet by John L. Capinera, describes this "true armyworm", a light reddish brown nocturnal moth bundant in North America east of the Rocky Mountains, whose larvae are notorious for appearing out of nowhere to inflict a high level of defoliation in grain crops.  Includes selected references.  Published by the UF Department of Entomology and Nematology, October 2006. EENY-394/IN702: Armyworm, Mythimna unipuncta (Haworth) (Insecta: Lepidoptera: Noctuidae) (ufl.edu)

Sign in / Sign up

Export Citation Format

Share Document