USE OF STANDARD TEMPERATURE THRESHOLDS AND PHENOLOGICAL PREDICTION FOR THE EUROPEAN CORN BORER (OSTRINIA NUBILALIS HÜBNER) IN ALBERTA

AbstractA degree-day model was developed for Alberta populations of Ostrinia nubilalis Hübner. Starting with overwintered fifth-instar larvae, the model calculates the temporal distribution of first- and second-instar larvae which are the stages most vulnerable to chemical suppression. Predictions from three alternative models were compared against field data from southern Alberta. Use of a standard 10°C growth threshold to calculate physiological time scales allowed predictions as accurate as those obtained using either a pooled threshold (11.4°C) calculated specifically from Alberta populations, or a model using two thresholds (12.3°C for fifth-instar larvae to adult and 10.2°C for eggs to second-instar larvae) that incorporated significant differences in growth characteristics observed among life stages. We conclude that standard thresholds are sufficient for degree-day models for northern populations of O. nubilalis. The standard model (t0 = 10°C) predicts that moth emergence will peak at ca. 145 degree-days after median pupation, and that numbers of eggs, and first- and second-instar larvae should peak at 200, 310, and 450 degree-days, respectively. Model predictions can be used to time sampling effort in support of management decisions.

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DEVELOPMENTAL ADAPTATION OF THE EUROPEAN CORN BORER (OSTRINIA NUBILALIS HÜBNER) IN ALBERTA

The Canadian Entomologist ◽

10.4039/ent119371-4 ◽

1987 ◽

Vol 119 (4) ◽

pp. 371-380 ◽

Cited By ~ 8

Author(s):

Dennis A. Lee ◽

John R. Spence

Keyword(s):

United States ◽

Ostrinia Nubilalis ◽

European Corn Borer ◽

The United States ◽

Life Stages ◽

Corn Borer ◽

Corn Borers ◽

Developmental Thresholds ◽

Temperature Thresholds ◽

Higher Temperature

AbstractTemperature effects on development were studied for two Alberta populations of Ostrinia nubilalis (Hübner), from the South Saskatchewan River valley and the surrounding plains. Lower developmental thresholds for all life stages of both Alberta populations were determined by linear regression. Thresholds for the egg stage were significantly less for plains borers (9.5°C) than for valley borers (10.8°C), and about 2°C lower than for corn borers from the United States. Thresholds in Alberta populations for the 4th (15.3°C) and 5th (14.0°C, plains) instars, and for post-diapause pupation (12.8°C), were much higher than in populations from the United States. Higher temperature thresholds delay development in Alberta populations, thus reducing midsummer pupation. Valley populations developed significantly faster than plains populations during egg development, during the prepupal period of the 5th instar, and during post-diapause pupation. These results explain why valley populations have a partial second generation in some years.

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A physiologically based approach for degree-day calculation in pest phenology models: the case of the European Corn Borer (Ostrinia nubilalis Hbn.) in Northern Italy

International Journal of Biometeorology ◽

10.1007/s00484-011-0464-z ◽

2011 ◽

Vol 56 (4) ◽

pp. 653-659 ◽

Cited By ~ 7

Author(s):

Andrea Maiorano

Keyword(s):

Ostrinia Nubilalis ◽

European Corn Borer ◽

Northern Italy ◽

Corn Borer ◽

Degree Day ◽

Physiologically Based ◽

Physiologically Based Approach

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FACTORS AFFECTING THE TEMPORAL DISTRIBUTION OF THE SPRING FLIGHT OF THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (LEPIDOPTERA: PYRALIDAE)

The Canadian Entomologist ◽

10.4039/ent113433-5 ◽

1981 ◽

Vol 113 (5) ◽

pp. 433-439 ◽

Cited By ~ 2

Author(s):

D. G. R. McLeod

Keyword(s):

Multiple Regression ◽

Ostrinia Nubilalis ◽

European Corn Borer ◽

Regression Line ◽

Light Trap ◽

Temporal Distribution ◽

Weather Factors ◽

Average Deviation ◽

Corn Borer ◽

Emergence Pattern

AbstractA multiple regression analysis was used to establish which weather factors and population parameters were important in determining the emergence pattern of the spring flight of the European corn borer, Ostrinia nubilalis (Hbn.), as measured by light trap catches. Equations which estimated the slope and intercept of a line representing the probit of cumulative percentage emergence vs. degree days had as independent variables the intercept of the previous year’s regression line and the average temperature for the preceding September, December, February, and April. A comparison of methods used to estimate the emergence pattern showed that the average deviation of the average date method was 5.0 days, the average slope and intercept method 2.8 days, and multiple regression method 1.6 days.

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SEX PHEROMONE COMPONENTS OF AN ALBERTA POPULATION OF EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HBN.) (LEPIDOPTERA: PYRALIDAE)

The Canadian Entomologist ◽

10.4039/ent119291-3 ◽

1987 ◽

Vol 119 (3) ◽

pp. 291-299 ◽

Cited By ~ 15

Author(s):

D.L. Struble ◽

J.R. Byers ◽

D.G.R. McLeod ◽

G.L. Ayre

Keyword(s):

Sex Pheromone ◽

Ostrinia Nubilalis ◽

European Corn Borer ◽

Corn Borer ◽

Sex Pheromone Components ◽

Delta Type ◽

Southern Alberta ◽

Pheromone Components ◽

Lepidoptera Pyralidae ◽

Trap Catches

AbstractThe sex pheromone components of European corn borer, Ostrinia nubilalis (Hbn.), from southern Alberta were identified in washes and extracts of abdomen tips from calling female moths. This is a Z strain population as (Z)-11- and (E)-11-tetradecenyl acetates were isolated in a ratio 100:2.4, and a corresponding synthetic blend in a ratio of 100:3 attracted males in the field. Dodecyl alcohol, tetradecyl alcohol and acetate, and (Z)-11-tetradecenol were also identified, but none of these components nor other "pheromone-like" mono-unsaturated C10 to C16 acetates had any effect on increasing the trap catches of male moths under field conditions. However, the addition of (Z)-9-dodecenyl acetate or (Z)-9-tetradecenyl acetate to the synthetic pheromone blend significantly reduced the capture of male moths, even though these compounds were not detectable in the female extracts. Pheromone blends used for monitoring the Z strain of the European corn borer must be essentially free, ca.< 0.1%, of these acetates. A commercially available, sticky-surface, delta-type trap was the most satisfactory of several tested for capturing moths under prairie conditions.

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PHENOLOGY OF THE EUROPEAN CORN BORER (OSTRINIA NUBILALIS) IN ALBERTA

The Canadian Entomologist ◽

10.4039/ent118943-10 ◽

1986 ◽

Vol 118 (10) ◽

pp. 943-956 ◽

Cited By ~ 1

Author(s):

Dennis A. Lee ◽

John R. Spence

Keyword(s):

Ostrinia Nubilalis ◽

European Corn Borer ◽

First Generation ◽

Dry Mass ◽

Degree Days ◽

Corn Borer ◽

Two Populations ◽

Pupal Mass ◽

Colonizing Ability ◽

Transplant Experiments

AbstractDifferences in phenology were observed between two populations of Ostrinia nubilalis (Hbn.) in Alberta. In the South Saskatchewan River valley, borers pupated and emerged 3–6 days earlier than on the plains. This was not simply a function of different microclimates because median pupation occurred at 331 degree-days (DD) for plains populations and at 490 DD for valley populations. First-generation flight extended from the last week in June until the 1st week in August. Flight peaks in 1983 occurred on 8 July in the valley and on 14 July on the plains. Flight was delayed in 1984 by cold nightly temperatures. In 1983 valley populations had a partial second generation, with a flight peak in late August. Mean pupal mass was significantly less for plains populations than valley populations. Transplant experiments demonstrated that these differences reflected mainly environmental influences. During spring 1984, mean larval mass in the two populations did not differ until early June, when both mean wet and dry mass of valley larvae increased significantly but those of plains larvae did not change. This variability of phenotypes contributes to the colonizing ability of the European corn borer.

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Predicting Risk of European Corn Borer Infestation in Sweet Corn Based on Harvest Date

HortTechnology ◽

10.21273/hortsci.19.1.173 ◽

2009 ◽

Vol 19 (1) ◽

pp. 173-180 ◽

Cited By ~ 2

Author(s):

Steve M. Spangler ◽

Dennis D. Calvin ◽

Joe Russo ◽

Jay Schlegel

Keyword(s):

Risk Prediction ◽

Ostrinia Nubilalis ◽

European Corn Borer ◽

Sweet Corn ◽

Harvest Date ◽

Prediction System ◽

Degree Days ◽

Corn Borer ◽

Central Pennsylvania ◽

Harvest Dates

Infestation of sweet corn (Zea mays) at harvest by european corn borer (Ostrinia nubilalis) was examined in 16 hybrid/harvest date combinations from 1994 through 1996 in central Pennsylvania. Two general periods of sweet corn ear infestation levels were observed. Infestations, expressed as proportion of ears infested, were 0.11 (11%) or lower in 10 of 11 plots harvested from 21 July to 23 Aug., whereas they were noticeably higher (30%–88%) in September and early October. Infestations expressed as larvae per ear showed the same temporal pattern. A nonlinear (sigmoidal) relationship was found between degree-days from 1 Jan. and proportion of ears infested. The higher infestations were caused by the second-generation larvae of the bivoltine ecotype. Based on these relationships, a risk-prediction system is proposed that anticipates, at planting, harvest infestation by using predicted harvest dates of sweet corn, european corn borer life stages, and infestation levels. Examples are presented for multiple plantings and hybrids for a specific site and a landscape (Pennsylvania). The risk prediction system we propose will allow growers to anticipate the risk of ear infestations at planting time, thus providing predictions that would help with management decisions.

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Voltinism of the European corn borer, Ostrinia nubilalis Hbn., in Poland

Plant Protection Science ◽

10.17221/9648-pps ◽

2000 ◽

Vol 36 (No. 4) ◽

pp. 147-149 ◽

Cited By ~ 3

Author(s):

Ľ. Cagáň ◽

G. Sobota ◽

B. Gabryš ◽

C. Kania

Keyword(s):

High Temperatures ◽

Ostrinia Nubilalis ◽

European Corn Borer ◽

Second Generation ◽

The Other ◽

Degree Days ◽

Corn Borer ◽

Mean Temperature ◽

The Difference ◽

Maize Stalks

From 1992 to 1996 the voltinism of the European com borer, Ostrinia nubilalis Hbn., was investigated in Poland. During the study, over 6000 larvae were collected in maize stalks in autumn. In 1994, pupal cases were observed in stalks. This indicated the development of second generation adults of the pest. Pupal cases were not found in other years of the study. The difference between 1994 and the other years was found when the degree-days accumulation at base 10°C was calculated for the periods between July 1 and July 19 (daylight 15 hrs 58 min), or July 29 (daylight 15 hrs 32 min). These values were highest in 1994 and reached 246.5°C, or 414.0°C respectively. The results indicate that degree-days accumulation during the whole year is not responsible for the development of the second generation. It appears that high temperatures in July (not only at the beginning, but also at the end) influenced the development of the second generation of 0. nubilalis in Poland. Average July daily temperatures in 1994 were extremely high (24.5°C). Such temperatures can allow a small partial development of the second generation of O. nubilalis at a relatively cold location like Wroclaw in Poland with a standard annual mean temperature of 8.3°C.

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