Lifetime Mating Potential and Reproductive Success in Males of the True Armyworm, Pseudaletia Unipuncta (Haw.) (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.

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

Journal of Entomological Science ◽

10.18474/0749-8004-38.3.431 ◽

2003 ◽

Vol 38 (3) ◽

pp. 431-438 ◽

Cited By ~ 2

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.

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

The Canadian Entomologist ◽

10.4039/ent1161647-12 ◽

1984 ◽

Vol 116 (12) ◽

pp. 1647-1652 ◽

Cited By ~ 27

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.

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Juvenile hormone production and sexual maturation in true armyworm,Pseudaletia unipuncta (HAW.) (lepidoptera: noctuidae): A comparison of migratory and non-migratory populations

Archives of Insect Biochemistry and Physiology ◽

10.1002/(sici)1520-6327(1996)32:3/4<575::aid-arch29>3.0.co;2-8 ◽

1996 ◽

Vol 32 (3-4) ◽

pp. 575-584 ◽

Cited By ~ 18

Author(s):

Jeremy N. McNeil ◽

Marlène Laforge ◽

Caroline Bédard ◽

Michel Cusson

Keyword(s):

Juvenile Hormone ◽

Sexual Maturation ◽

Hormone Production ◽

Pseudaletia Unipuncta ◽

True Armyworm ◽

Lepidoptera Noctuidae

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

Canadian Journal of Zoology ◽

10.1139/z03-115 ◽

2003 ◽

Vol 81 (8) ◽

pp. 1367-1377 ◽

Cited By ~ 5

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.

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

EDIS ◽

10.32473/edis-in702-2006 ◽

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)

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