scholarly journals Control of Fall Armyworm and Corn Earworm with Chemical and Biological Insecticides in Florida Sweet Corn, Fall 1994

1996 ◽  
Vol 21 (1) ◽  
pp. 113-114
Author(s):  
P.A. Stansly ◽  
J.M. Conner
Keyword(s):  
Bacillus Thuringiensis ◽  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Diaphragm Pump ◽  
High Clearance

Abstract The efficacy of azadirachtin formulations alone and in combination with Bacillus thuringiensis var. aizawai, two formulations of cyhalothrin, and Lannate were compared. Six polyethylene-mulched beds 32 inches wide configured in 2 sets of 3 on 6 ft centers separated by a 15 ft drive middle were planted on 29 Aug in double rows 12 inches between rows and plants. The center bed was used as an untreated source of inoculum and the remaining beds divided into 33 ft plots and assigned treatments in a RCBD with 7 treatments and 4 replications. Whorls of all plants were inoculated with 1-2 neonate fall armyworm larvae on 5 Oct using a bazooka gun and Grito-O-Cobs at 24-4O mesh. Treatments were applied weekly for 6 weeks beginning 7 Oct using a high clearance sprayer configured with 1 overhead nozzle per row equipped with a diaphragm pump operating at 200 psi and calibrated to delivery 21 gpa at 2.5 mph. APSA 80 was tank mixed with Karate and Lannate treatments at 5 oz/100 gallon. The dispersants Petro and Morwet were added to 25% of the spray water at a rate of 0.38 gram of 3% microencapsulated azadirachtin (WRC7305) and mixed for 3 minutes before adding remaining water containing the adjuvant B-1956 at 2 oz/gal. Feeding on inner 3 whorl leaves or tassel was rated weekly for 16 plants on a scale of 1 to 6 corresponding to 0, >1%, 2-5%, 6-10%, 11-30%, and >30% damage respectively. The same 16 plants per plot were harvested twice and number and ears evaluated for weight and marketability. Culls were evaluated as to cause of damage and larvae identified and counted. In addition, 10 stalks from each plot were opened to search for borers but none were found.

Effects of Bacillus thuringiensis Transgenic Corn on Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae) Densities

2007 ◽  
Vol 100 (2) ◽  
pp. 327-334 ◽  
Author(s):  
C. F. Chilcutt ◽  
G. N. Odvody ◽  
J. Carlos Correa ◽  
J. Remmers
Keyword(s):  
Bacillus Thuringiensis ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Transgenic Corn ◽  
Lepidoptera Noctuidae

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.

scholarly journals EFFICACY OF FOLIAR INSECTICIDES AGAINST CORN EARWORM AND FALL ARMYWORM ON SWEET CORN, 2009

2010 ◽  
Vol 35 (1) ◽  
Author(s):  
John F. Smith ◽  
Lucas N. Owen ◽  
Angus L. Catchot
Keyword(s):  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm

scholarly journals Direct Silk Applications of Corn Oil and Bacillus thuringiensis as a Barrier to Corn Earworm Larvae in Sweet Corn

2003 ◽  
Vol 13 (3) ◽  
pp. 509-514 ◽  
Author(s):  
Rosalind Cook ◽  
Anne Carter ◽  
Pam Westgate ◽  
Ruth Hazzard
Keyword(s):  
Bacillus Thuringiensis ◽  
Helicoverpa Zea ◽  
Sweet Corn ◽  
Corn Oil ◽  
Field Studies ◽  
Corn Earworm ◽  
Untreated Plot ◽  
Promising Alternative ◽  
First Instar ◽  
Almost All

Field studies were conducted in 2000 and 2001 to rate the efficacy and longevity of four pesticide treatments against corn earworm (Helicoverpa zea) larvae (CEW) in sweet corn (Zea mays). The four treatments used were 1) corn oil, 2) Bacillus thuringiensis ssp. kurstaki (Bt), 3) oil + Bt, and 4) an untreated plot. All treatments were applied on silk day 5. Silk day 1 was the first day that more than 50% of the ears had 2.5 cm (1 inch) or more silks emerging from the husk using a hand-held pump applicator. Two first-instar CEW larvae were placed directly into silk channel of selected ears on 6 different days (days 3, 6, 9, 12, 15, and 18 after first silk). The same six ears were then harvested 4 days later. Untreated ears had more live CEW and higher levels of feeding damage than the other three treatments ears for all harvest days in both years. The number of CEW found per ear was lower when Bt was included in the treatment. The use of corn oil gave the lowest damage ratings on almost all harvest days in both years. Treatments which contained oil had the highest number of marketable ears in both years, but also the highest percentage of underdeveloped kernels at the tip of the ear (6% to 9%). The oil and Bt treatments appeared to control CEW for at least 17 days, from silking through maturity. This treatment regime appears to be a promising alternative for growers to conventional pest management methods.

EVALUATION OF SELECTED INSECTICIDES FOR CONTROL OF CORN EARWORM AND FALL ARMYWORM IN SWEET CORN, 2004

2005 ◽  
Vol 30 (1) ◽  
Author(s):  
J. Kurk Lance ◽  
John N. All ◽  
Michelle Samuel-Foo
Keyword(s):  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm

scholarly journals Presence of Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae) Populations in Sweet Corn and their Susceptibility to Insecticides in Puerto Rico

2019 ◽  
Vol 102 (2) ◽  
pp. 451 ◽  
Author(s):  
Diego M. Viteri ◽  
Angela M. Linares ◽  
Irma Cabrera ◽  
Leidy Sarmiento
Keyword(s):  
Puerto Rico ◽  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Lepidoptera Noctuidae

Management of Corn Earworm and Fall Armyworm (Lepidoptera: Noctuidae) Injury on a Sweet Corn Hybrid Expressing a cryIA(b) Gene

1999 ◽  
Vol 92 (5) ◽  
pp. 1217-1222 ◽  
Author(s):  
R. E. Lynch ◽  
B. R. Wiseman ◽  
H. R. Sumner ◽  
D. Plaisted ◽  
D. Warnick
Keyword(s):  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Lepidoptera Noctuidae ◽  
Corn Hybrid
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