Euxoa ochrogaster (Guenée), redbacked cutworm, Euxoa messoria (Harris), darksided cutworm, and Euxoa auxiliaris (Grote), army cutworm (Lepidoptera: Noctuidae).

AbstractThe phenology and reproductive status of adults of the redbacked cutworm, Euxoa ochrogaster (Guenée), were determined from blacklight (BLT) and sex-attractant (SAT) trap catches at four locations in southern Manitoba in 1987 through 1989. The flight period was of 9–12 weeks duration, extending from late June to early October. The first male and female moths were captured at about the same time in the BLT and SAT. The peak catches of the BLT occurred during the first 3 weeks of August (weeks 5 and 6 of the flight period) and those of the SAT about 1 week later. The SAT continued to capture male moths for 2–3 weeks after the last moths appeared in the BLT. Most females captured during the first 2–3 weeks of the flight period were virgins who had not yet initiated egg development. Most mating, egg development, and oviposition took place during a 3- to 4-week period that included the 2 weeks before, the same week as, and the week after the peak BLT catches (weeks 3–7 of the flight period); these activities occurred in the 3–4 weeks before the peak SAT catches. The data suggested that there was competition between SAT and females in attracting males and, consequently, the SAT catch data may not be providing accurate measurements of the sizes of breeding populations of males in the field. The BLT catches underestimated the length of the flight period by about 1.5–3 weeks.

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First report of redbacked cutworm damage to cow cockle [Vaccaria hispanica (Mill.) Rauschert], a potential new crop for western Canada

Canadian Journal of Plant Science ◽

10.4141/cjps10143 ◽

2011 ◽

Vol 91 (2) ◽

pp. 425-428 ◽

Cited By ~ 3

Author(s):

Christian Willenborg ◽

Lloyd Dosdall

Keyword(s):

Linear Relationship ◽

Seed Yield ◽

Seed Weight ◽

Insect Pest ◽

Western Canada ◽

First Report ◽

Euxoa Ochrogaster ◽

Redbacked Cutworm ◽

New Crop ◽

Strong Linear Relationship

Willenborg, C. J. and Dosdall, L. M. 2011. First report of redbacked cutworm damage to cow cockle [ Vaccaria hispanica(Mill.) Rauschert], a potential new crop for western Canada. Can. J. Plant Sci. 91: 425–428. We report the effects of redbacked cutworm Euxoa ochrogaster (Guenée) on cow cockle [Vaccaria hispanica (Mill.) Rauschert] plant height, seed yield, and 1000-seed weight (TSW). Euxoa ochrogaster damage to plots varied considerably among genotypes, with some genotypes exhibiting <10% damage and others >45%. Seed yield also varied significantly among genotypes and exhibited a strong linear relationship with the extent of E. ochrogaster damage. This is the first known report of any insect pest feeding on cow cockle. Results suggest that E. ochrogaster has the potential to cause significant losses in cow cockle crops.

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CUTWORMS (LEPIDOPTERA: NOCTUIDAE) OF TOBACCO IN NOVA SCOTIA: II. FALL RYE AND WINTER FALLOW EFFECTS ON A FIELD POPULATION

The Canadian Entomologist ◽

10.4039/ent10673-1 ◽

1974 ◽

Vol 106 (1) ◽

pp. 73-77

Author(s):

H. B. Specht

Keyword(s):

Nova Scotia ◽

Winter Rye ◽

Tobacco Plants ◽

Peridroma Saucia ◽

Cultural Methods ◽

Variegated Cutworm ◽

Euxoa Messoria ◽

Field Plots ◽

Lepidoptera Noctuidae ◽

Winter Fallow

AbstractTwice as many larvae of the dark-sided cutworm, Euxoa messoria Harr., were found in rye fall-seeded tobacco field plots than in winter-fallowed tobacco field plots. There were corresponding differences in numbers of injured tobacco plants. Cutworm aggregations were more prominent in the winter rye than in the winter fallowed area of the tobacco field with low populations of dark-sided cutworms.Larvae of the variegated cutworm, Peridroma saucia Hbn., appeared 2 to 4 weeks later than dark-sided cutworm larvae and winter cultural methods had little effect on their numbers.

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Optimized conditions for sex attractant trapping of male redbacked cutworm moths,Euxoa ochrogaster (Guen�e)

Journal of Chemical Ecology ◽

10.1007/bf00987670 ◽

1980 ◽

Vol 6 (3) ◽

pp. 585-591 ◽

Cited By ~ 10

Author(s):

Warren Steck ◽

M. D. Chisholm ◽

E. W. Underhill ◽

C. C. Peters

Keyword(s):

Sex Attractant ◽

Euxoa Ochrogaster ◽

Optimized Conditions ◽

Redbacked Cutworm

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ASSESSMENT OF TOBACCO LOSSES CAUSED BY THE DARK-SIDED CUTWORM, EUXOA MESSORIA (LEPIDOPTERA: NOCTUIDAE), DELHI, ONTARIO

The Canadian Entomologist ◽

10.4039/ent103534-4 ◽

1971 ◽

Vol 103 (4) ◽

pp. 534-541 ◽

Cited By ~ 16

Author(s):

H. H. Cheng

Keyword(s):

Population Density ◽

Tobacco Plant ◽

New Method ◽

Crop Losses ◽

Euxoa Messoria ◽

Average Current ◽

Lepidoptera Noctuidae

AbstractIntensive studies on the damage and losses of flue-cured tobacco caused by the dark-sided cutworm, Euxoa messoria (Harris), were carried out in the field at Delhi, Ont., during 1967 and 1968. A new method for estimating the accurate tobacco crop losses is illustrated. Assessment of damage of the tobacco plant and the population density in relation to the yield are described. The yield was significantly related, negatively, to the dark-sided cutworm density, and was reduced in the cutworm-damaged blocks in comparison with the yield in the undamaged check blocks. Assessment of average losses caused by the species was 17% of marketable tobacco, which, based on the average current prices, would amount to 200 dollars per acre or approximately 25 million dollars over the country as a whole every year.

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THE RESPONSE OF FLAX TO DIFFERENT POPULATION DENSITIES OF THE RED-BACKED CUTWORM, EUXOA OCHROGASTER (GN.) (LEPIDOPTERA: NOCTUIDAE)

The Canadian Entomologist ◽

10.4039/ent12221-1 ◽

1990 ◽

Vol 122 (1) ◽

pp. 21-28 ◽

Cited By ~ 6

Author(s):

G.L. Ayre

Keyword(s):

Plant Growth ◽

Soil Surface ◽

Field Studies ◽

Crop Loss ◽

Population Densities ◽

Larval Population ◽

Plant Yield ◽

Stable Relationship ◽

Euxoa Ochrogaster ◽

Lepidoptera Noctuidae

AbstractControlled field studies carried out in plots within a field of NorMan flax, Linum usitatissum L., showed that the loss of flax plants caused by the red-backed cutworm was proportional to the number of cutworm larvae present. A density of 16 larvae per 0.5 m2 destroyed most plants by severing the plant stems at the soil surface. The loss of only some plants at larval densities lower than 16 larvae per 0.5 m2 resulted in a small but significant increase in per plant yield but the increase did not completely compensate for the yield reductions caused by plant loss. The larvae removed plants in blocks with the result that the density of the remaining plants was unchanged and the opportunity for compensating plant growth was limited. An equation defining this relationship between larval densities and yield is presented. Ancillary experiments in which the population of cutworm larvae was sequentially sampled showed that, after an initial loss of about 20% when the plots were established in the field, the larval population remained constant. The proportion of the larvae found around damaged plants also remained constant until the larvae became immobile through preparation for pupation. Because of this stable relationship, reliable estimates of potential crop loss from cutworm larvae in flax should be possible by sampling for cutworms only around damaged plants within a specified row length.

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OVIPOSITION AND LONGEVITY OF THE DARK-SIDED CUTWORM, EUXOA MESSORIA (LEPIDOPTERA: NOCTUIDAE), IN THE LABORATORY

The Canadian Entomologist ◽

10.4039/ent104919-6 ◽

1972 ◽

Vol 104 (6) ◽

pp. 919-925 ◽

Cited By ~ 18

Author(s):

H. H. Cheng

Keyword(s):

Oviposition Period ◽

Male And Female ◽

Significant Difference ◽

Euxoa Messoria ◽

The Mean ◽

Honey Solution ◽

Lepidoptera Noctuidae ◽

Adult Food

AbstractIn the laboratory, the mean number of eggs laid per female of the dark-sided cutworm, Euxoa messoria (Harris), fed on honey solution was 1303.8; when given water alone 261.3; and 86.4 when held without food or water. Adult food significantly increased the longevity and oviposition period and reduced the pre-oviposition period. There was no significant difference between the weight of male and female pupae. The weight of the female pupae was significantly correlated with: the oviposition period; the number of eggs laid; the longevity, except moths fed on honey solution; but not the pre-oviposition period, regardless of food taken as adults. Females fed on honey solution mated successfully, 30% of them more than once. When given water or nothing the number of mated females was reduced. Dissections showed that adult food accelerated the development of eggs and increased the fecundity potential.

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INSECT PARASITES OF THE DARKSIDED CUTWORM, EUXOA MESSORIA (LEPIDOPTERA: NOCTUIDAE), IN ONTARIO

The Canadian Entomologist ◽

10.4039/ent109137-1 ◽

1977 ◽

Vol 109 (1) ◽

pp. 137-142 ◽

Cited By ~ 11

Author(s):

H. H. Cheng

Keyword(s):

Internal Parasites ◽

Host Parasite Relationship ◽

Parasite Relationship ◽

Euxoa Messoria ◽

Host Parasite ◽

Lepidoptera Noctuidae ◽

Insect Parasites

AbstractIn the study of insect parasites of the darksided cutworm, Euxoa messoria (Harris), fourth- to seventh-instar larvae were collected from a field at Delhi, Ont., and reared in the laboratory. A total of 701 insect parasites including six species of Hymenoptera and four of Diptera, were reared from the 3970 darksided cutworm larvae collected in 1973 and 1974.Thirteen species of insect parasites of E. messoria are listed. Ten of these species were reared in the present study from E. messoria in Ontario and all of them are primary and internal parasites. Of the 10, only two have previously been reported as parasites of E. messoria. Host–parasite relationship and the degree of parasitism are given for the 10 species reared in Ontario.

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