scholarly journals BT Corn Performance Against First- and Second-Generation Infestations of European Corn Borer, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 374-375
Author(s):  
K. R. Ostlie ◽  
K. M. Helgeson
Keyword(s):  
European Corn Borer ◽  
First Generation ◽  
Second Generation ◽  
Egg Laying ◽  
Row Spacing ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Leaf Injury ◽  
First And Second Generation ◽  
Neonate Larvae

Abstract Six transgenic corn hybrids expressing insecticidal proteins produced by genes from Bacillus thuringiensis (Bt) were evaluated at the Rosemount Experiment Station in separate experiments that targeted first and second generations. The hybrids representing 5 different insertion events, and their non-Bt isolines were evaluated in a RCB design with tour replications. Test hybrids were planted in the center 2 rows of a 4-row plot (22 ft long, 30-inch row spacing). Border rows were planted to NK 4640Bt to preclude inter-plot movement of larvae. Plots were planted on 21 May using a cone planter and thinned to 30,000 plants/A. In view of extensive natural first generation infestation, the second-generation experiment was treated with Warrier 1 E (zeta cypermethrin) @ 3.8 fl oz/acre on 15 Jul. In each plot, 15 consecutive plants were tested for Bt expression and non-expressers were rogued on 29 Jul. The plants intended for first generation evaluation were infested at the V6 with neonate larvae in grits deposited in the whorl on 14 Jul. Heavy natural egg laying from second generation eliminated the need for manually infesting second-generation plots. First generation evaluations included: number and length of tunnels on 21 Aug and % of plants with leaf injury and a leaf injury rating on 24 Sep. On 9 Oct the second generation measurements were recorded: number of overwintering larvae, tunnel number and length, and shank and ear damage.

scholarly journals Evaluation of Transgenic Corn Against European Corn Borer, 1997D

1998 ◽  
Vol 23 (1) ◽  
pp. 378-378
Author(s):  
K. R. Ostlie ◽  
J. Luedeman ◽  
P. Price ◽  
M. Jharco ◽  
George Nelson
Keyword(s):  
European Corn Borer ◽  
First Generation ◽  
Row Spacing ◽  
Transgenic Corn ◽  
Tunnel Length ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Leaf Injury ◽  
Normal Production ◽  
Production Practices

Abstract This experiment was conducted to assess the per formance of Bacillus thuringiensis transgenic corn hybrids (<95-day RM) and comparable non-Bt hybrids against a natural ECB infestation in west centra Minnesota. This area contains a mixture of univoltine and multivoltine biotypes. Treatments included 3 non-Bt hybrids (Ciba 4144, NK 2555, NK 3030) anc their isogenic counterparts (Max 357, NK 2555Bt, NK 3030Bt) arranged in a RCB design with 6 replications. Plots, each measuring 50 ft by 8 rows (30-inch row spacing), were planted on 19 May at a rate of 30,000 seeds per acre using a Hiniker Econo Till Planter. Planting preparations, fertilizer and herbicide ap plications followed normal production practices. First generation evaluations on 5 Aug included % of plants with leaf injury, leaf injury ratings (1 to 9 scale) number of tunnels, and tunnel length. Combined effects of univoltine and second generations were measured by examining tunnel number and length, ear anc shank infestations, and overwintering larvae on 20 Sept. Plots were harvested on 10 Oct and yields were corrected to 15.5% moisture.

scholarly journals Evaluation of Transgenic Corn Against European Corn Borer, 1997B

1998 ◽  
Vol 23 (1) ◽  
pp. 376-377
Author(s):  
K. R. Ostlie ◽  
J. Luedeman ◽  
P. Price ◽  
J. Bhend ◽  
B. Potter ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
European Corn Borer ◽  
First Generation ◽  
Row Spacing ◽  
Transgenic Corn ◽  
Tunnel Length ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Leaf Injury ◽  
Loam Soil

Abstract This experiment was conducted to assess the performance of Bacillus thuringiensis (Bt) transgenic corn hybrids (100- and 105-day RM) and comparable non-Bt hybrids against a natural ECB infestation in southwest Minnesota. Plots, each measuring 50 ft by 8 rows (30-inch row spacing), were established in Normania loam soil on 5 May at a rate ol 30,000 seeds per acre. Plots were arranged in a RCB with four replications. ECB injury assessments for first generations on 4 Aug included % shotholing from the center two rows of each plot and leaf injury ratings from 10 plants per plot. Tunnel length and number from both the first generation and univoltine generations were measured simultaneously from 10 plants per plot on 27 Aug. Measurements for second-generation ECB on 15-16 Oct included cumulative tunnel length and number, fall larvae, and ear and shank damage. Plots were harvested on 23 Oct and yields were corrected to 15.5% moisture.

scholarly journals Evaluation of Transgenic Corn Against European Corn Borer, 1997C

1998 ◽  
Vol 23 (1) ◽  
pp. 377-378
Author(s):  
K. R. Ostlie ◽  
J. Luedeman ◽  
P. Price ◽  
K. Helgeson ◽  
J. Rowe
Keyword(s):  
European Corn Borer ◽  
First Generation ◽  
Row Spacing ◽  
Silt Loam ◽  
Tunnel Length ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Leaf Injury ◽  
East Central ◽  
Loam Soil

Abstract This experiment was conducted to assess the performance of Bacillus thuringienis (Bt) trangenic corn hybrids (100- and 105-day RM) and comparable non-Bt hybrids against a natural ECB infestation in east central Minnesota. Plots, each measuring 50 ft by 8 rows (30- inch row spacing), were established in Dakota silt loam soil on 19 May at a rate of 32,000 seeds per acre. Plots were arranged in a RCB with four replications. ECB injury assessments for first generation on 30 Jul included % shotholing from the center two rows of each plot and leaf injury ratings (1 to 9 scale) from 10 plants per plot. Tunnel length and number from first generation were measured from 10 plants per plot on 13-15 Aug. Measurements for second generation ECB on 14, 20, & 27 Oct included cumulative tunnel length and number, fall larvae, ear and shank damage from 10 plants per plot. Plants were harvested on 6 Nov and yields were corrected to 15.5% moisture.

scholarly journals The Effectiveness of Br-Corn Hybrids for Control of European Corn Borer, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 426-427
Author(s):  
J.T. Shaw ◽  
K.L. Steffey ◽  
M.E. Gray ◽  
J.W. Finger
Keyword(s):  
European Corn Borer ◽  
First Generation ◽  
Rating Scale ◽  
Leaf Axil ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Damage Data ◽  
The Mean ◽  
Corn Plants ◽  
Neonate Larvae

Abstract Corn was planted at the University of Illinois Cruse Farm, Champaign, Illinois, on 24 May. The experimental design was a split plot with natural or manual infestation of ECB as the main plots and 5 different B/-corn hybrids and their non-Br isolines as the subplots. Each plot was 4 rows (30-inch) wide X 40 ft long with 35 plants per row (after thinning). Treatments were replicated 5 times. Manual ECB infestations to simulate the first-generation were made on 3 and 6 July at the V7 corn leaf stage by releasing approximately 50 neonate larvae in corn grit into the whorls of corn plants using a ‘bazooka’ applicator. Manual ECB infestations to simulate the second-generation were made at corn anthesis on 7 Aug by applying approximately 25 neonate larvae in corn grit to the leaf exiles above and below the ear node. On 8 Aug, 25 neonate larvae were applied to the ear node and the second leaf axil above the ear node. All manual infestations were made to all plants (70 total) in the middle 2 rows of each plot. On 31 Jul, 20 consecutive plants were rated for leaf feeding by first generation larvae by using the 1 to 10 Guthrie scale. On 9 and lOOct, 15 consecutive plants from 1 of the middle 2 rows were split with a corn knife for evaluation. The number of plants with cavities and the total length of cavities per plant were recorded. Also, the number of live larvae per plant was recorded. The mean percentage of plants with cavities, the mean length of stalk tunneling (in inches) per plant and the mean number of live larvae were determined for each plot. ECB damage to the ear and shank were analyzed separately from the stalk damage data. An ear rating scale of 1 to 3 was used, with 1 being tip damage only, 2 being side damage only, and 3 being tip + side damage on the same ear. Shelled grain weights (yields) were taken from the 15 dissected plants, corrected to 15.5% moisture, and added to the machine harvested weights (moisture corrected) for the remaining plants of the middle 2 rows in each plot.

Quantitative Trait Loci for First‐ and Second‐Generation European Corn Borer Resistance Derived from the Maize Inbred Mo47

Crop Science ◽  
2002 ◽  
Vol 42 (2) ◽  
pp. 584-593 ◽  
Author(s):  
Chaba Jampatong ◽  
Michael D. McMullen ◽  
B. Dean Barry ◽  
Larry L. Darrah ◽  
Patrick F. Byrne ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
European Corn Borer ◽  
Second Generation ◽  
Corn Borer ◽  
Trait Loci ◽  
First And Second Generation

scholarly journals Granular Insecticide Performance Against First and Second Generation European Corn Borer, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 229-230
Author(s):  
N. B. Shamiyeh ◽  
C. H. Roberts ◽  
F. A. Hale
Keyword(s):  
European Corn Borer ◽  
Second Generation ◽  
Corn Borer ◽  
First And Second Generation

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.

Quantitative Trait Loci for First- and Second-Generation European Corn Borer Resistance Derived from the Maize Inbred Mo47

Crop Science ◽  
2002 ◽  
Vol 42 (2) ◽  
pp. 584 ◽  
Author(s):  
Chaba Jampatong ◽  
Michael D. McMullen ◽  
B. Dean Barry ◽  
Larry L. Darrah ◽  
Patrick F. Byrne ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
European Corn Borer ◽  
Second Generation ◽  
Corn Borer ◽  
Trait Loci ◽  
First And Second Generation

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.

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