FACTORS AFFECTING MORTALITY OF THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HÜBNER), IN ALBERTA

AbstractA combination of laboratory and field trials, from 1983 to 1985, were used to determine mortality factors affecting all life stages of Alberta populations of the European corn borer, Ostrinia nubilalis (Hübner), feeding on corn. The resulting life table demonstrated that greatest mortality occurred during the first and second larval instars (62.2%), when mature larvae are in diapause (69.5%), and from moth migration and loss in reproductive potential (70.3%). Stages where mortality was slight included the egg stage (11.7%), non-diapausing third- to fifth-instar larvae (2%), and pupae (10.4%).Laboratory trials showed that greater egg mortality occurred at relative humidities (RH) of 35 and 55% than at a RH of 75%. In the field, egg parasitism was nil, predation of early-instar larvae (5.2%) and diapausing larvae (6%) was low, and parasitoids were scarce (emerging from ca. 2% of pupae). Sustained periods of hot, dry weather with high moisture stress were related to mortality of both eggs and early-instar larvae. Death of early-instar larvae also was related to periods of rainy weather with low evaporation. The 64% non-diapause larval mortality was much lower than that reported elsewhere. The dramatic increase in the corn borer since its recent introduction to Alberta may be due to a lack of natural enemies, and because only non-resistant corn hybrids are grown.

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SOME FACTORS AFFECTING DIAPAUSE IN THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HBN.) (LEPIDOPTERA: PYRALIDAE)

Canadian Journal of Zoology ◽

10.1139/z59-019 ◽

1959 ◽

Vol 37 (2) ◽

pp. 161-168 ◽

Cited By ~ 19

Author(s):

J. A. Mutchmor ◽

W. E. Beckel

Keyword(s):

Oxygen Consumption ◽

Ostrinia Nubilalis ◽

European Corn Borer ◽

Corn Borer ◽

Factors Affecting ◽

Lepidoptera Pyralidae

At 65° F, the percentage of larvae of the European corn borer entering diapause increased from practically 0 to 95 as the photoperiod was increased from 0 to 9.5–14 hours of light per day, and decreased sharply to a minimum of 3 as photoperiod was increased to 16 or more hours of light per day. Rearing and studies on oxygen consumption revealed that, to be most effective, exposure to factors inducing diapause must begin before the second day of the final instar, and must continue for a period equivalent to the duration of the final instar at 65° F. Exposure during any single instar but the last was not effective in inducing diapause.

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A PHENOLOGY MODEL AND FIELD EVALUATION OF BEAUVERIA BASSIANA (BALS.) VUILLEMIN (DEUTEROMYCOTINA: HYPHOMYCETES) MYCOSIS OF THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HBN.) (LEPIDOPTERA: PYRALIDAE)

The Canadian Entomologist ◽

10.4039/ent120133-2 ◽

1988 ◽

Vol 120 (2) ◽

pp. 133-144 ◽

Cited By ~ 24

Author(s):

Ziding Feng ◽

Raymond I. Carruthers ◽

Timothy S. Larkin ◽

Donald W. Roberts

Keyword(s):

Beauveria Bassiana ◽

Ostrinia Nubilalis ◽

European Corn Borer ◽

Larval Mortality ◽

Field Evaluation ◽

Time Model ◽

Corn Borer ◽

Corn Borers ◽

Phenology Model ◽

Validation Experiments

AbstractA simulation model was developed to predict the timing of European corn borer, Ostrinia nubilalis (Hbn.), larval mortality following exposure to Beauveria bassiana (Bals.) Vuillemin conidia. Model response was compared with laboratory and field data collected specifically for model validation. In laboratory validation experiments, four conidial doses of a B. bassiana isolate collected from the People’s Republic of China were applied to European corn borer larvae which were then incubated at fluctuating temperatures. Simulation results compared favorably with fungal development and mycosis under laboratory conditions. Field validation experiments showed that applications of B. bassiana to European corn borer neonates in whorl-stage corn resulted in mortality levels over 60% when conidia and European corn borers were placed on the plants on the same day. When B. bassiana conidia were placed on plants prior to European corn borers, mortality decreased linearly with time. Model predictions of the timing of European corn borer mortality were found to be accurate when B. bassiana conidia were placed on corn plants at the same time or prior to European corn borers. When European corn borers were placed on plants prior to conidia, the model underestimated the time to European corn borer death. Lack of model fit in this situation is thought to be due to delayed host and pathogen interactions on the corn plant rather than poor prediction of the physiological development of the disease.

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Prevalence rates of Trichogramma evanescens (Westwood) in Ostrinia nubilalis (Hübner) population in the south of russia in 2013-2018

BIO Web of Conferences ◽

10.1051/bioconf/20201800012 ◽

2020 ◽

Vol 18 ◽

pp. 00012

Author(s):

Inna Grushevaya

Keyword(s):

Population Dynamics ◽

Ostrinia Nubilalis ◽

European Corn Borer ◽

First Generation ◽

Second Generation ◽

Prevalence Rates ◽

Mortality Factors ◽

Trichogramma Evanescens ◽

Corn Borer ◽

Two Generations

The European corn borer Ostrinia nubilalis (Hübner) is a dangerous corn pest – a convenient object for studying population dynamics and assessing various pest mortality factors. The mortality of European corn borer’s eggs by the natural parasite population Trichogramma evanescens (Westwood) was estimated in 2013–2018 in the Gulkevichsky district of the Krasnodar Territory. Two generations of the European corn borer are developing in the Krasnodar Territory. Often pest’s first generation of is not infected with the parasite. When monitoring the abundance of the second generation, even in years with a low abundance of the European corn borer, infected phytophage eggs are found in the crops of grain corn. Infection of eggs of the second-generation European corn borer in 2013-2018 ranged from 0.26 to 69.55 eggs / m2, with an average of 37.53 eggs / m2.

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Physical and biochemical factors affecting diapause in insects; especially in the European corn borer, Ostrinia nubilalis: a review

Physiological Entomology ◽

10.1111/j.1365-3032.1980.tb00246.x ◽

1980 ◽

Vol 5 (4) ◽

pp. 367-383 ◽

Cited By ~ 2

Author(s):

DALE B. GELMAN ◽

D. K. HAYES

Keyword(s):

Ostrinia Nubilalis ◽

European Corn Borer ◽

Corn Borer ◽

Factors Affecting

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Variation Between Samples of Immature Stages, and of Mortalities from Some Factors, of the European Corn Borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Pyralidae), on Sweet Corn in Quebec

The Canadian Entomologist ◽

10.4039/ent93867-10 ◽

1961 ◽

Vol 93 (10) ◽

pp. 867-888 ◽

Cited By ~ 12

Author(s):

M. Hudon ◽

E. J. LeRoux

Keyword(s):

Ostrinia Nubilalis ◽

European Corn Borer ◽

Sweet Corn ◽

Life Tables ◽

Sampling Techniques ◽

Mortality Factors ◽

Corn Borer ◽

Lepidoptera Pyralidae ◽

Specific Factors ◽

Basic Studies

This is a report on a program to sample the European corn borer, Ostrinia nubilalis (Hbn.), with the object of obtaining reliable statistics for life tables (see e.g. Morris, 1955; LeRoux and Reimer, 1959).Basic studies on factors determining abundance of the European corn borer are few, some of the most notable having been carried out by Barber (1926), Huber et al. (1928), Thompson and Parker (1928), Stirrett (1938), Vance (1943), Baker et al. (1949), Bigger and Petty (1953), Everett et al. (1958) and Chiang and Hodson (1959). None of these studies was a thorough study of mortality factors in development of the European corn borer from endemic to epidemic levels. A number of specific factors known to be important in the epidemiology of this species have been investigated by Arbuthnot (1949), Neiswander (1952), Goleman (1954), Chiang and Holdaway (1955), and Chiang (1959), and the application of biometric techniques to the sampling of corn borer populations has been studied by Beard (1943), McGuire (1954), and Bankcroft and Brindley (1956). None of the latter authors have, however, investigated sampling techniques relating to the development of life tables for this species.

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