Corn Earworm and Fall Armyworm Occurrence and Control on Sweet Corn Ears in South Florida12

1973 ◽  
Vol 66 (4) ◽  
pp. 973-974 ◽  
Author(s):  
M. J. Janes
Keyword(s):  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
And Control

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 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.

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

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 Larval and pupal stage of Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) in sweet and field corn genotypes

2003 ◽  
Vol 63 (4) ◽  
pp. 627-633 ◽  
Author(s):  
L. M. Santos ◽  
L. R. Redaelli ◽  
L. M. G. Diefenbach ◽  
C. F. S. Efrom
Keyword(s):  
Sex Ratio ◽  
Spodoptera Frugiperda ◽  
Sweet Corn ◽  
Fall Armyworm ◽  
Pupal Stage ◽  
Phase Duration ◽  
Larval Phase ◽  
Field Corn ◽  
Lack Of Information ◽  
And Control

Spodoptera frugiperda, the fall armyworm, is a very significant polyphagous pest due to the damages it causes, and control difficulties. Lack of information about its impact on sweet corn motivated a comparison of its biology, with respect to the larval and pupal stages, among the genotypes ELISA, BR 400 (sweet corns), and BR PAMPA (field corn). In laboratory conditions (25 ± 1ºC; 70 ± 10% RH; photophase 12 hours), 35 caterpillars were individualized and fed daily with 3.14 cm² sections of corn leaves from the referred-to genotypes, cultivated in plots in the experimental area of the Departament of Fitossanidade, UFRGS, Porto Alegre, RS from October to November 2000. The caterpillars were weighed daily; after each molt, the cephalic capsules were collected and measured (in width), to establish growth rate; pupae were weighed and sexed when 24 hours old. The duration of the larval instars, the pupal sex ratio, and the mortality of larvae and pupae were evaluated. In the first three instars there were no differences registered in capsule width. In the fourth and fifth instars, capsules of caterpillars kept in BR 400 were smaller. The weight of caterpillars and pupae, instar duration and sex ratio did not differ among the genotypes. Pupal phase duration was less in females kept in BR 400. Mortality was greater in the larval phase in ELISA and in the pupal phase in BR PAMPA.

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

scholarly journals Insect Management for Sweet Corn

EDIS ◽  
2019 ◽  
Vol 2005 (14) ◽  
Author(s):  
Gregg S. Nuessly ◽  
Susan E. Webb
Keyword(s):  
Sweet Corn ◽  
Fall Armyworm ◽  
Corn Earworm ◽  
Economic Losses ◽  
Publication Date ◽  
Stink Bugs ◽  
White Grubs ◽  
Insect Management ◽  
Sap Beetles ◽  
Root Feeding

Foliar, ear and root feeding insects can routinely cause economic losses to sweet corn if left untreated. The most important pests of sweet corn in Florida are the fall armyworm, corn earworm, lesser cornstalk borer, cutworms, corn silk fly, cucumber beetles, aphids, and wireworms. Less common pests of sweet corn include grasshoppers, corn blotch leafminer, twospotted spider mites, sap beetles, stink bugs, maize weevils and billbugs, white grubs, and white fringed beetles.  This document is ENY-472 (which replaces ENY-449), one of a series of the Department of Entomology and Nematology, UF/IFAS Extension. Original publication date November 2001. Revised September 2005.  ENY-472/IG158: Insect Management for Sweet Corn (ufl.edu)

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