scholarly journals CORN EARWORM AND EUROPEAN CORN BORER CONTROL WITH BT-TREATED CORN, 1999

2001 ◽  
Vol 26 (1) ◽  
Author(s):  
K. A. Sorensen ◽  
C. Wade Holloway
Keyword(s):  
European Corn Borer ◽  
Corn Earworm ◽  
Corn Borer

scholarly journals CONTROL OF CORN EARWORM AND EUROPEAN CORN BORER ON SWEET CORN, 1998

1999 ◽  
Vol 24 (1) ◽  
Author(s):  
P. K. O'Rourke ◽  
E. C. Burkness ◽  
W. D. Hutchison
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Earworm ◽  
Corn Borer

scholarly journals Evaluation of Efficacy of Selected Conventional and Experimental Insecticides and Bt Hybrids for Control of Corn Earworm and European Corn Borer on Sweet Corn, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 99-100
Author(s):  
J. T. Shaw ◽  
R. Weinzierl ◽  
J. W. Finger
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Earworm ◽  
Compressed Air ◽  
Hollow Cone ◽  
Corn Hybrids ◽  
Corn Borer ◽  
Chemical Treatments ◽  
Untreated Check ◽  
High Clearance

Abstract The tests were arranged in a RCB design with four replications. Each plot consisted of four rows, each being 30 inches wide and 50 ft long. Thirty-foot-wide alleys were established between the four replications. Insecticides were applied to the middle two rows of each plot, leaving two untreated rows between adjoining plots. Twelve insecticide treatments were compared with two Br-sweet corn hybrids (Heritage Bt and Bonus Bt) and their non-Bt isolines to two untreated controls. The 12 chemical treatments and the two untreated checks were planted with the Silver King variety sweet corn. Two untreated check plots were included in each replication and were averaged for the ANOVA. Treatments were applied very four to five days beginning on 8 Aug at 8% silk. All insecticide treatments were applied with a modified John Deere 6000 high-clearance vehicle (HCV) with a rear-mounted boom. Six Conejet (TX VS-8) hollow-cone nozzles (three per row) were calibrated to deliver 30.1 gpa at 40 psi and a speed of 2.5 mph, utilizing a compressed air system. Four nozzles (two per row) were attached to drops and directed the spray towards the ear zone area, a third nozzle (one per row) was mounted directly over the row with the spray being directed into the whorl (tassel) area.

Ear Pests and Damage to Organic, Conventional and Bt-Protected Sweet Corn Grown in Central Kentucky

2009 ◽  
Vol 44 (4) ◽  
pp. 383-390
Author(s):  
John D. Sedlacek ◽  
Karen L. Friley ◽  
Steve L. Hillman
Keyword(s):  
Helicoverpa Zea ◽  
European Corn Borer ◽  
Sweet Corn ◽  
Crop Protection ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Genetically Engineered ◽  
Corn Borer ◽  
Sap Beetles ◽  
Southwestern Corn Borer

Sweet corn (Zea mays L. var. rugosa) was grown in replicated plots in 2004 and 2006 using organic, conventional, and genetically-engineered (Bt) production practices. Organic plots were treated with Entrust® (Dow AgroSciences LLC, Indianapolis, IN) whereas conventional and Bt sweet corn plots were treated with Warrior® (Syngenta Crop Protection, Inc., Greensboro, NC). All plots were treated once at silk emergence. Organic and conventional plots were treated again 1 wk later. Twenty-five ears were harvested from row centers in each treatment subplot to quantify ear pests and assess ear damage. The highest number of corn earworm, Helicoverpa zea (Boddie), larvae were found on organically-grown sweet corn. European corn borer, Ostrinia nubilalis (Hübner); southwestern corn borer, Diatraea grandiosella Dyar; and fall armyworm, Spodoptera frugiperda (J.E. Smith), larvae were not found as frequently. Neither corn earworm nor European corn borer larvae were found on Bt sweet corn ears. Sap beetles, Carpophilus lugubris Murray, were found on all 3 types of sweet corn. Organically and conventionally-grown sweet corn had a greater number of tip-damaged ears and numbers of damaged kernels per ear than Bt sweet corn. Ear length and weight were the same for all 3 types of sweet corn. Based on the information generated in this study, growing late-planted sweet corn organically or conventionally on a large commercial scale with a limited spray program and without using other types of ear pest management does not appear to be a practical or profitable option in central Kentucky.

Mortality of Two Lepidopterans in Response to Selected Commercial Formulations of Bacillus thuringiensis Berliner2

1999 ◽  
Vol 34 (3) ◽  
pp. 273-285
Author(s):  
Richard L. Ridgway ◽  
Robert R. Farrar
Keyword(s):  
Bacillus Thuringiensis ◽  
Helicoverpa Zea ◽  
European Corn Borer ◽  
Uv Light ◽  
Field Studies ◽  
Corn Earworm ◽  
The Other ◽  
Speed Of Kill ◽  
Matrix Formulation ◽  
Corn Borer

Five commercial granular formulations of Bacillus thuringiensis Berliner marketed for controlling the European corn borer, Ostrinia nubilalis (Hübner), were compared for insecticidal activity using treated discs of bean leaves. Three formulations, Dipel 10G®, Full-Bac ECBG™, and Strike BT®, were similar in terms of both mortality and speed of kill. A formulation containing a strain of B. thuringiensis developed by plasmid fusion, Condor G®, caused mortality similar to the other three formulations, but the speed of kill was slower. A fifth formulation containing a B. thuringiensis toxin produced by Pseudomonas fluorescens Migula as result of a gene transfer, M-Peril™, caused substantially less mortality than any of the other formulations. An experimental water dispersible formulation, based on a previously developed granular matrix formulation containing B. thuringiensis and a nutrient-based phagostimulant, caused significantly higher mortality of the European corn borer than a similar formulation without the phagostimulant. Simulated field studies were conducted to study the effects of the phagostimulant on feeding and protection of B. thuringiensis from ultraviolet (UV) light. Bean plants treated with B. thuringiensis and the phagostimulant were exposed to different UV regimes outdoors under canopies made of specialized acrylic plastics and then infested with larvae of the corn earworm, Helicoverpa zea (Boddie). A significant interaction between the UV regimes and the phagostimulant was found, indicating that the phagostimulant acted both as a feeding stimulant and as a UV protectant to enhance the activity of B. thuringiensis.

scholarly journals The nucleopolyhedroviruses of Rachiplusia ou and Anagrapha falcifera are isolates of the same virus

1999 ◽  
Vol 80 (10) ◽  
pp. 2793-2798 ◽  
Author(s):  
Robert L. Harrison ◽  
Bryony C. Bonning
Keyword(s):  
Heliothis Virescens ◽  
Helicoverpa Zea ◽  
European Corn Borer ◽  
Biological Activities ◽  
Corn Earworm ◽  
Tobacco Budworm ◽  
Predicted Amino Acid Sequence ◽  
Corn Borer ◽  
Anagrapha Falcifera ◽  
Relationship Of

The 7·8 kb EcoRI-G fragment of Rachiplusia ou multicapsid nucleopolyhedrovirus (RoMNPV), containing the polyhedrin gene, was cloned and sequenced. The sequence of the fragment was 92·3% identical to the sequence of the corresponding region in the Autographa californica (Ac)MNPV genome. A comparison of the EcoRI-G sequence with other MNPV sequences revealed that RoMNPV was most closely related to AcMNPV. However, the predicted amino acid sequence of RoMNPV polyhedrin shared more sequence identity with the polyhedrin of Orygia pseudotsugata MNPV. In addition, the RoMNPV sequence was almost completely identical (99·9%) to a previously published 6·3 kb sequence of Anagrapha falcifera MNPV (AfMNPV). The Eco RI and HindIII restriction fragment profiles of RoMNPV and AfMNPV also were nearly identical, with an additional EcoRI band detected in RoMNPV DNA. Bioassays of these viruses with three different hosts (the European corn borer, Ostrinia nubilalis H übner, the corn earworm, Helicoverpa zea Boddie, and the tobacco budworm, Heliothis virescens Fabricius) failed to detect any differences in the biological activities of RoMNPV and AfMNPV. These results indicate that RoMNPV and AfMNPV are different isolates of the same virus. The taxonomic relationship of Ro/AfMNPV and AcMNPV is discussed.

scholarly journals Control of European Corn Borer and Corn Earworm on Sweet Corn, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 94-94
Author(s):  
E. C. Burkness ◽  
P. K. O'Rourke ◽  
W. D. Hutchison
Keyword(s):  
European Corn Borer ◽  
Sweet Corn ◽  
Corn Earworm ◽  
Corn Borer

Enhancement of Activity of Bacillus thuringiensis Berliner Against Four Lepidopterous Insect Pests by Nutrient-Based Phagostimulants1

1995 ◽  
Vol 30 (1) ◽  
pp. 29-42 ◽  
Author(s):  
Robert R. Farrar ◽  
Richard L. Ridgway
Keyword(s):  
Bacillus Thuringiensis ◽  
Ostrinia Nubilalis ◽  
Helicoverpa Zea ◽  
European Corn Borer ◽  
Insect Pests ◽  
Diamondback Moth ◽  
Lethal Dose ◽  
Corn Earworm ◽  
Corn Borer ◽  
Whole Plants

To help improve control of insect pests with microbial insecticides, we investigated the interactions of four commercial, nutrient-based phagostimulants (Pheast [AgriSense], Coax [CCT Corp.], Gusto [Atochem North America, Inc.], and Entice [Custom Chemicides] with Bacillus thuringiensis Berliner and four lepidopterous insect pests (gypsy moth, Lymantria dispar [L.] [Lymantriidae]; corn earworm, Helicoverpa zea [Boddie] [Noctuidae]; European corn borer, Ostrinia nubilalis [Hübner] [Pyralidae]; and diamondback moth, Plutella xylostella [L.] [Plutellidae]). Comparisons were made of treated foliage in Petri dishes in the laboratory and of sprayed whole plants in a greenhouse. In general, phagostimulants increased mortality of all species tested, but no consistent differences among phagostimulants were found for any species. Food consumption was generally lower on the treatments that contained phagostimulants causing the highest rates of mortality, possibly as a result of more rapid ingestion of a lethal dose on these treatments. Reduced rates of feeding by insects on treatments with B. thuringiensis alone were seen, probably due in part to intoxication and, possibly, to behavioral effects as well. Indications of potentially significant interactions between host plants and both B. thuringiensis and phagostimulants also were seen.

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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