scholarly journals Control of European Corn Borer in Whorl Stage Corn, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 185-185
Author(s):  
John F. Witkowski
Keyword(s):  
Experimental Design ◽  
European Corn Borer ◽  
Corn Borer ◽  
Egg Masses ◽  
Single Row ◽  
Insecticide Application ◽  
Application Date

Abstract The experimental design was RCB with 13 insecticide treatments and a control replicated 4 times. Single row plots were 50 ft in length and at 30 inch spacings. Corn was planted into double disk corn stalks on 25 Apr. Granular insecticides were applied in a 7 inch band with cone belt distributors mounted on a Hahn Hi-Boy. Liquid insecticides were applied with a backpack sprayer in 20 gal of water/acre at 30 psi, except for 2 treatments of Pounce 3.2 EC, which were applied at 10 & 30 gal of water/acre. Application date was 29 Jun. Five d prior to insecticide application 6 black headed ECB egg masses were infected in marked plants for later evaluation. On 26 Jul, the 10 marked plants in each replicate were dissected from tassel to ground, examined and the number of corn borer cavities recorded.

scholarly journals Control of Second-Generation European Corn Borer, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 212-212
Author(s):  
John Witkowski ◽  
Jerry Echtenkamp
Keyword(s):  
Experimental Design ◽  
Analysis Of Variance ◽  
European Corn Borer ◽  
Second Generation ◽  
Middle Portion ◽  
Corn Borer ◽  
Egg Masses ◽  
Dixon County ◽  
Paper Disc

Abstract Foliar treatments of registered and non-registered insecticides for second-generation European corn borer control were applied to irrigated corn plots in Dixon County, NE on 12 Aug. Liquid-formulated insecticides were applied with a Hahn Hi-Boy calibrated to deliver 17 gpa at 30 psi. Four d prior to application, 6 black-headed egg masses on paper disc were pinned to the middle portion of 10 marked com plants in each replicate. Experimental design was RCB with 4 replications. On 25 Sep, the infested plants were dissected from tassel to ground, examined and the number of corn borer larvae recorded. Results were analyzed using analysis of variance procedures. Treatment means were separated using LSD procedures.

scholarly journals Control of Second Generation European Corn Borer, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 215-215
Author(s):  
J. F. Witkowski
Keyword(s):  
Experimental Design ◽  
European Corn Borer ◽  
Second Generation ◽  
Middle Portion ◽  
Corn Borer ◽  
Egg Masses ◽  
2Nd Generation ◽  
Dixon County ◽  
Corn Plants ◽  
Paper Disc

Abstract Foliar treatments of registered and non-registered insecticides for 2nd generation ECB were applied to irrigated corn plots in Dixon County, NE on 12 Aug. Liquid formulated insecticides were applied with a Hahn hi-boy calibrated to deliver 17 gal/acre at 30 psi. Granular formulated insecticides were applied with Noble granulator units mounted on the same Hahn hi-boy with 10 inch row banders. Twenty-four h prior to application, 6 black headed egg masses on paper disc were pinned to the middle portion of 10 marked corn plants in each replicate per treatment. Experimental design was a RCB with 4 replications. On 17 Sep, 10 marked plants per replicate were dissected from tassel to ground, examined and the number of ECB larvae recorded.

Stimulation of Oviposition and Heterosis in Interstrain Crosses of European Corn Borer (Lepidoptera: Pyralidae)

1992 ◽  
Vol 27 (3) ◽  
pp. 239-250
Author(s):  
Clifford B. Keil ◽  
Christopher Tipping
Keyword(s):  
Egg Production ◽  
European Corn Borer ◽  
Random Mating ◽  
Daily Basis ◽  
Pupal Weight ◽  
Corn Borer ◽  
Egg Masses ◽  
Lepidoptera Pyralidae ◽  
Mass Mating ◽  
Stimulation Of

Hybrid matings of two Ostrinia nubilalis (Hübner) (Lepidoptera: Pyralidae) colonies (N and O), established in the laboratory a year apart, demonstrated positive heterosis in the F1 generation as indicated by increases in pupal weight (6%), number of egg masses per female (65%) and number of eggs per female (77%) as compared to intra-colony crosses in mass matings. In contrast, pupation date, an indicator of development time, was intermediate in the hybrids relative to the parental colonies. There was also a 37% increase in the numbers of eggs/female and a 45% increase in egg masses/female in the hybrid parental cross. We investigated this stimulation of oviposition in single female, reciprocal crosses. Oviposition stimulation was directional with the cross of N colony males x O colony females exhibiting significantly higher numbers of total eggs/female and egg masses/female on a daily basis. Colony O females in this cross laid more large egg masses than females in other crosses. Data from individual female crosses demonstrated that egg production in hybrid mass mating experiments was consistent with random mating of males and females from both colonies.

Estimation of european corn borer egg masses density by sampling of runs

1989 ◽  
Vol 31 (2) ◽  
pp. 289-304
Author(s):  
J. Vaillant ◽  
S. Derridj
Keyword(s):  
European Corn Borer ◽  
Corn Borer ◽  
Egg Masses

PHENOLOGY AND INFESTATION LEVEL OF THE EUROPEAN CORN BORER, OSTRINIA NUBILALIS (HÜBNER) (LEPIDOPTERA: PYRALIDAE), IN SOUTHERN MANITOBA

1990 ◽  
Vol 122 (6) ◽  
pp. 1211-1220 ◽  
Author(s):  
P. Palaniswamy ◽  
B. Galka ◽  
B. Timlick
Keyword(s):  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Mass Density ◽  
Damage Threshold ◽  
Egg Mass ◽  
Flight Period ◽  
Pheromone Traps ◽  
Trap Catch ◽  
Corn Borer ◽  
Egg Masses

AbstractStudies were conducted from 1985 to 1988 in commercial corn fields distributed throughout the main corn growing areas of Manitoba to determine the distribution, phenology, and the level of infestation of the European corn borer, Ostrinia nubilalis (Hübner). Pheromone and blacklight traps were used to monitor the flight activity of European corn borer throughout the flight period. The level of European corn borer infestation was determined by sampling for egg masses, hatched egg masses, plants with egg masses, plants with shot holes, larvae, and stalk breakage. Results indicated that the European corn borer infestation occurred throughout the corn growing areas of Manitoba and that the population has declined from 1985 through 1988. Significant positive correlations existed among the number of egg masses, plants with egg masses, plants with shot holes, larvae per plant, and plants with broken stalks. Peak capture of moths in pheromone traps occurred well after peak oviposition, and 10–14 days after the peak blacklight trap capture. Blacklight trap catch, but not the pheromone trap catch, was positively correlated with egg mass density. Both blacklight and pheromone traps were equally efficient in determining the onset and the duration of European corn borer flight, although for initiating surveys of egg masses and shot hole damage, pheromone traps are recommended. In Manitoba, corn growers apply pesticides well before the recommended damage threshold is reached.

scholarly journals Greenhouse Evaluation of Capsicum Accessions for Resistance to European Corn Borer (Ostrinia nubilalis)

HortScience ◽  
2004 ◽  
Vol 39 (6) ◽  
pp. 1336-1338 ◽  
Author(s):  
James D. Frantz ◽  
Jeffrey Gardner ◽  
Michael P. Hoffmann ◽  
Molly M. Jahn
Keyword(s):  
Ostrinia Nubilalis ◽  
European Corn Borer ◽  
Fruit Size ◽  
Aphid Resistance ◽  
The Other ◽  
Corn Borer ◽  
Egg Masses ◽  
Relative Susceptibility ◽  
Greenhouse Evaluation ◽  
Fruit Damage

A replicated greenhouse evaluation of a range of commercial and noncommercial (Capsicum spp.) accessions for resistance to european corn borer (ECB) [Ostrinia nubilalis (Hubner)] was conducted. Percentage of fruit damaged was observed among 29 accessions four weeks after plants were artificially infested with ECB egg masses. Small-fruited peppers generally showed lower levels of damage, while large-fruited peppers were the most susceptible. Genotypes with elongate fruit were less damaged than those with bell-shaped fruit. Resistance to fruit damage was also associated with increasing pungency level, with two notable exceptions. The pungent genotype `Large Red Thick Cayenne' was significantly more susceptible than many of the other pungent accessions tested. The relative susceptibility of this accession may be related to large fruit size. The nonpungent pepper `Corno di Toro' showed significantly lower percent fruit damage than other nonpungent peppers including `Banana Supreme' with roughly similar fruit size, ranking amidst highly pungent peppers such as `Red Scotch Bonnet'. These results confirm that resistance to ECB can be identified in nonpungent Capsicum genotypes and demonstrate that pungency is not always correlated with ECB damage. Reported sources of aphid resistance or tolerance showed good levels of ECB resistance, but interpretation of these results was confounded by the presence of pungency.

scholarly journals Insecticide Applied Aerially for Control of First Generation European Corn Borer, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 185-185
Author(s):  
John F. Witkowski
Keyword(s):  
European Corn Borer ◽  
First Generation ◽  
Corn Borer ◽  
Egg Masses ◽  
The Town ◽  
Plot Design

Abstract The cornfield was located in Cedar county, northwest of the town of Hartington, NE. Six black headed egg masses were infested onto 30 marked plants (3, ten plant subsamples) per treatment on 24 Jun. A Cessna 188 Ag Truck was used to make the applications on 30 Jun. Aerial treatments were flown on in a strip plot design. On 9 Aug, all artificially infested plants were dissected from tassel to ground and examined for borer cavities.

Distribution of European Corn Borer (Lepidoptera: Pyralidae) Egg Masses and Larvae on Sweet Corn in New York

1986 ◽  
Vol 15 (3) ◽  
pp. 501-506 ◽  
Author(s):  
A. M. Shelton ◽  
J. P. Nyrop ◽  
A. Seaman ◽  
R. E. Foster
Keyword(s):  
New York ◽  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Borer ◽  
Egg Masses ◽  
Lepidoptera Pyralidae

scholarly journals Corn Earworm and European Corn Borer Control with Insecticides, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 102-102
Author(s):  
K. A. Sorensen ◽  
C. Wade Holloway
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Earworm ◽  
Hollow Cone ◽  
Corn Borer ◽  
Single Row ◽  
Untreated Area

Abstract ‘Golden Queen’ sweet corn was seeded on 22 I Apr near Calabash, NC in Brunswick Co. Single-row plots, 10 ft long on 42-inch centers, were replicated 4 times in a RCB design. Alleys of 5 ft were used I between replicates. Treatments were applied with a CO2-pressurized backpack sprayer using a single hollow-cone nozzle (18X) operating at 60 psi to deliver 54.5 gpa. Test 1 and Test 2 were in the same field with a 75 ft spacing of untreated area between the two test sites. Applications were made to both Test 1 and Test 2 twice a week on 27 and 30 Jun, and 3, 7, 10, 14, and 17 Jul. Insect-damaged ears were assayed on 21 Jul when all ears were harvested from both tests.

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