European Corn Borer (Lepidoptera: Pyralidae): Rate of First-Generation Larval Mortality in Sorghum Hybrids Compared with Inbred Lines of Maize During the Whorl Stage of Plant Development

1984 ◽  
Vol 77 (4) ◽  
pp. 929-931
Author(s):  
S. Dharmalingam ◽  
W. D. Guthrie ◽  
J. L. Jarvis ◽  
D. Kindler ◽  
R. E. Atkins ◽  
...  
Keyword(s):  
Plant Development ◽  
European Corn Borer ◽  
First Generation ◽  
Larval Mortality ◽  
Inbred Lines ◽  
Corn Borer ◽  
Lepidoptera Pyralidae

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.

Parasitism Rates in European Corn Borer (Lepidoptera: Crambidae) Larvae Collected from Six Maize Hybrids

2001 ◽  
Vol 36 (4) ◽  
pp. 342-351
Author(s):  
Thomas L. Clark ◽  
John F. Witkowski ◽  
John E. Foster
Keyword(s):  
European Corn Borer ◽  
First Generation ◽  
Second Generation ◽  
Larval Mortality ◽  
Corn Borer ◽  
Percentage Parasitism ◽  
Macrocentrus Grandii ◽  
Naturally Occurring ◽  
Parasitism Rates ◽  
High Larval Mortality

The parasitoid complex and level of parasitism of European corn borer, Ostrinia nubilalis (Hübner), larvae in six maize, Zea mays L., hybrids was determined in Nebraska during 1995 and 1996. Three parasitoids, Eriborus terebrans (Gravenhorst), Macrocentrus grandii Goidanich, and Lixophaga sp., were reared from field-collected European corn borer larvae. Larvae collected from Hoegemeyer 2626 exhibited the highest percentage parasitism for the 1995 first generation in Lancaster (37.2%) and Dixon (28.6%) counties. No significant differences were identified for the 1995 second generation at both sites because of reduced sample size and high larval mortality caused by naturally-occurring entomopathogens. During 1996, there were several significant differences in percentage parasitism of larvae collected from the hybrids. Larvae collected from Northrup King N7070 exhibited the highest first-generation parasitism (23.8%), while larvae collected from Hoegemeyer 1125W exhibited the highest second-generation parasitism (46.0%) in Dixon Co. In Lancaster Co., parasitism of first-generation larvae collected from Hoegemeyer 1125W (10.3%) was only significantly greater than parasitism of larvae collected from Hoegemeyer 2626 (1.1%). Results indicate that European corn borer larval parasitism is significantly affected by the maize hybrid planted in the field; however, differences may vary among years and generations as environmental factors affect the maize phenology.

THE SEVERITY OF STALK ROT OF GRAIN CORN IN RELATION TO INFESTATIONS OF A BIVOLTINE STRAIN OF THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (LEPIDOPTERA: PYRALIDAE)

1983 ◽  
Vol 115 (9) ◽  
pp. 1235-1237
Author(s):  
W. H. Foott ◽  
P. R. Timmins
Keyword(s):  
Zea Mays ◽  
Fusarium Graminearum ◽  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Direct Relationship ◽  
Inbred Lines ◽  
Gibberella Zeae ◽  
Corn Borer ◽  
Stalk Rot ◽  
Lepidoptera Pyralidae

Corn lodging due to bent or broken stalks results mostly from feeding by the European corn borer, Ostrinia nubilalis (Hübner), and from stalk rot infections. Stalk rot of corn (Zea mays L.) is caused in southwestern Ontario mainly by Gibberella zeae (Schw.) Petch (Fusarium graminearum Schwabe), which attacks roots during the summer and invades the bases of the stems as the plants mature (Gates and Mortimore 1972). Several studies in the U.S.A. reported an association between the rot and the borer. Christensen and Schneider (1950) recorded severest stalk rot with highest borer infestation and found that inbred lines usually free from rot became susceptible when infested by the borer. Chiang and Wilcoxson (1961) reported a higher incidence of rot in plants artificially inoculated with Fusarium graminearum and borer larvae than in those inoculated with F. graminearum alone. A recent study in Iowa (Jarvis et al. 1982) showed that the greatest stalk rot damage occurred in high borer infestations. Carson and Hooker (1981), however, were unable to relate the incidence and severity of rot to corn borer infestation. In their 3-year study, the least rot occurred in the year of severest borer infestation. Since observations in corn fields in southwestern Ontario also indicated that there might not be a direct relationship between severity of stalk rot and severity of corn borer infestation, further studies were undertaken.

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.

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