OCCURRENCE OF A TWO GENERATION STRAIN OF THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (LEPIDOPTERA: PYRALIDAE), IN QUEBEC

1979 ◽  
Vol 111 (3) ◽  
pp. 233-236 ◽  
Author(s):  
D. G. R. McLeod ◽  
C. Ritchot ◽  
T. Nagai
Keyword(s):  
New York ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
First Generation ◽  
New York State ◽  
Corn Borer ◽  
York State ◽  
Two Generations ◽  
Critical Photoperiod ◽  
Lepidoptera Pyralidae

AbstractThere are now two strains of the European corn borer, Ostrinia nubilalis (Hübner), in Quebec. The strain normally found produces one generation while the more recently introduced strain produces two generations per year. Both strains have been characterized and compared with corn borer strains from Ontario and New York State. The two attributes of the recently introduced strain that promote the development of a second generation are (1) early emergence in the spring with less intense diapause and (2) a lower critical photoperiod for diapause induction. The latter characteristic allows pupation of first generation larvae. Field and laboratory tests on the pheromone response of adult male moths demonstrated that the origin of this recent introduction was New York State.

EFFECTS OF A NATURAL BIVOLTINE STRAIN OF THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (LEPIDOPTERA: PYRALIDAE), ON GRAIN CORN YIELDS IN SOUTHWESTERN ONTARIO, 1973–77

1981 ◽  
Vol 113 (7) ◽  
pp. 585-591
Author(s):  
W. H. Foott ◽  
P. R. Timmins
Keyword(s):  
Moisture Content ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
First Generation ◽  
Second Generation ◽  
Yield Losses ◽  
Corn Borer ◽  
Lepidoptera Pyralidae

AbstractA 5-year study of a bivoltine strain of the European corn borer, Ostrinia nubilalis (Hübner), showed that first-generation moths deposited more eggs on early-planted corn, whereas second-generation moths oviposited more frequently on late-planted corn. The second generation was much larger than the first generation and caused the greater reduction in yield, regardless of whether the yields were based on physiological losses or a combination of physiological losses and dropped ears. It was shown that delay of harvest beyond the time that moisture content of the corn was sufficiently low for machine harvesting could result in severe yield losses from broken stalks and dropped ears during autumn storms.

Sex pheromone of the european corn borer,Ostrinia nubilalis (Lepidoptera: Pyralidae), in New York

1975 ◽  
Vol 1 (2) ◽  
pp. 225-231 ◽  
Author(s):  
J. Kochansky ◽  
R. T. Card� ◽  
J. Liebherr ◽  
W. L. Roelofs
Keyword(s):  
New York ◽  
Sex Pheromone ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Corn Borer ◽  
Lepidoptera Pyralidae

EUROPEAN CORN BORER, OSTRINIA NUBILALIS (LEPIDOPTERA: PYRALIDAE), ON WHEAT

1980 ◽  
Vol 112 (8) ◽  
pp. 861-863 ◽  
Author(s):  
Harold R. Willson
Keyword(s):  
New York ◽  
Winter Wheat ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Herbaceous Plant ◽  
Corn Borer ◽  
Economic Significance ◽  
Lepidoptera Pyralidae ◽  
Growing Region

The European corn borer, Ostrinia nubilalis Hübner, is known to attack nearly every herbaceous plant large enough for the larvae to enter. Although the borer is primarily considered a pest of corn, economic infestations in such New York crops as potatoes, gladiolus, and other large stem plants are not uncommon.In 1977, 1978, and 1979, economic levels of borer infestations were observed in winter wheat. In 1977, the presence of borer in wheat was noted at a number of sites, but only a few cases could be considered economically significant. However, in the 1978 season, the presence of borer in wheat had become common and reports of economic infestations exceeding 5 or 10% were widespread in the western New York wheat growing region. In 1979, the problem of borer on wheat declined significantly, and of infestations located, only one could be considered of economic significance.

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

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.

MATING FREQUENCY OF THE FEMALE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (LEPIDOPTERA: PYRALIDAE), IN SOUTHWESTERN ONTARIO

1977 ◽  
Vol 109 (1) ◽  
pp. 117-122 ◽  
Author(s):  
W. M. Elliott
Keyword(s):  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Light Trap ◽  
Mating Frequency ◽  
Trap Catch ◽  
Previous Night ◽  
Corn Borer ◽  
Two Generations ◽  
Lepidoptera Pyralidae ◽  
Trap Catches

AbstractEuropean corn borer moths were caught in an ultraviolet light trap from early June to late October at Harrow, Ont. Two conspicuous peaks of light trap catches occurred each year, corresponding to two generations, but a third generation was deduced from three peaks of occurrence of virgin females. The number of moths which could be caught with nets in the day time correlated with the light trap catch of the previous night (r = 0.7). Most of the moths caught in the light trap or in nets were females but males predominated in the early June, September, and October catches. The shortage of males in the second generation was shown to influence the proportion of females mating, but not the number of spermatophores per female. Most females mated once and the number of matings per female did not differ enough between years to account for differences in adult populations.

Heritability and stability of resistance to Bacillus thuringiensis in Ostrinia nubilalis (Lepidoptera: Pyralidae)

1999 ◽  
Vol 89 (5) ◽  
pp. 449-454 ◽  
Author(s):  
F. Huang ◽  
R.A. Higgins ◽  
L.L. Buschman
Keyword(s):  
Bacillus Thuringiensis ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Realized Heritability ◽  
Corn Borer ◽  
Two Generations ◽  
Stability Of Resistance ◽  
Lepidoptera Pyralidae ◽  
Laboratory Colonies ◽  
Pressure Resistance

AbstractRealized heritability, h2, of resistance in European corn borer, Ostrinia nubilalis (Hübner), to Bacillus thuringiensisBerliner ssp. kurstaki endotoxins was examined in five resistant laboratory colonies. These colonies were reared on a meridic diet that incorporated a commercial formulation of B. thuringiensis, Dipel ES. Resistance in these colonies reached 42–67× by the seventh to twentieth selected generations and then plateaued. The realized heritability of resistance averaged 0.17–0.31 over all selected generations for the five colonies. In the three Iowa colonies, the highest realized heritability, 0.18–0.33, occurred during the second period of selection (seventh to thirteenth selected generations). In the two Kansas colonies, the highest realized heritability, 0.36 and 0.46, occurred during the first period of selection (first to sixth selected generations). In the absence of selection pressure, resistance in the southwest Kansas colony decreased from 62× to 42× after two generations, and remained at about that level for the next five generations.

EVIDENCE OF A MALE SEX PHEROMONE IN THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HÜBNER) (LEPIDOPTERA: PYRALIDAE)

1992 ◽  
Vol 124 (1) ◽  
pp. 113-116 ◽  
Author(s):  
Lucie Royer ◽  
Jeremy N. McNeil
Keyword(s):  
Sex Pheromone ◽  
Mating System ◽  
Mating Success ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Male Pheromone ◽  
Corn Borer ◽  
Male Sex Pheromone ◽  
Lepidoptera Pyralidae ◽  
Male Sex

AbstractEuropean corn borer males have hair pencils located ventrally on the 8th sternite and these are extruded when a male approaches a calling female. The fact that (i) antennectomized females mated significantly less than both intact controls and individuals subjected to other forms of surgery, and (ii) males with hair pencils removed had a significantly lower mating success than control males, suggests that a male pheromone is involved in the mating system of the European corn borer.

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