Survival of Fall Armyworm larvae and Yields of Field Corn After Artificial Infestations

1974 ◽  
Vol 67 (1) ◽  
pp. 119-123 ◽  
Author(s):  
W. L. Morrill ◽  
G. L. Greene
Keyword(s):  
Fall Armyworm ◽  
Field Corn

Distribution of Fall Armyworm Larvae. 1. Regions of Field Corn Plants Infested by Larvae 1

1973 ◽  
Vol 2 (2) ◽  
pp. 195-198 ◽  
Author(s):  
Wendell L. Morrill ◽  
G. L. Greene
Keyword(s):  
Fall Armyworm ◽  
Field Corn ◽  
Corn Plants

scholarly journals Assessment of Experimental Bt Events Against Fall Armyworm and Corn Earworm in Field Corn

2004 ◽  
Vol 97 (2) ◽  
pp. 259-264 ◽  
Author(s):  
G. David Buntin ◽  
Kathy L. Flanders ◽  
Robert E. Lynch
Keyword(s):  
Fall Armyworm ◽  
Corn Earworm ◽  
Field Corn

Evaluation of Insecticide Thresholds in Late-Planted Bt and Non-Bt Corn for Management of Fall Armyworm (Lepidoptera: Noctuidae)

2020 ◽  
Vol 113 (2) ◽  
pp. 814-823
Author(s):  
Tom R Bilbo ◽  
Francis P F Reay-Jones ◽  
Jeremy K Greene
Keyword(s):  
South Carolina ◽  
Helicoverpa Zea ◽  
Management Strategies ◽  
Fall Armyworm ◽  
Field Trials ◽  
Bt Corn ◽  
Significant Protection ◽  
Corn Hybrids ◽  
Field Corn ◽  
Development Of Resistance

Abstract The fall armyworm, Spodoptera frugiperda (J. E. Smith), is a major pest of corn in North and South America. It is managed primarily with transgenic corn-producing insecticidal proteins of Bacillus thuringiensis (Bt), but the development of resistance threatens their durability and necessitates the use of alternative management strategies. We conducted late-planted field trials during 2016 and 2017 in South Carolina using natural infestations. We evaluated the use of Bt and non-Bt corn hybrids in combination with foliar applications of chlorantraniliprole at varying infestation thresholds to protect field corn from infestation and damage and determine effects on grain yield. All Bt hybrids were more effective at reducing fall armyworm infestation rates and leaf injury than multiple insecticide sprays, and no Bt hybrid reached the lowest infestation threshold (20%) to require supplemental insecticide treatments, despite infestations in non-Bt corn reaching >68% in each year. The only Bt and/or insecticide treatment to significantly reduce ear feeding or the proportion of ears injured (mainly by Helicoverpa zea [Boddie]) was the Bt hybrid pyramid producing Vip3A. However, significant protection of yield was detected only in the Bt hybrids producing Cry1A.105 + Cry2Ab2. All Bt traits tested in this study were effective in reducing infestation and feeding damage from fall armyworm, although this did not always result in significant protection of yield. Our results demonstrate the potential and limitations of using chlorantraniliprole with Bt (when resistance is present) and non-Bt corn to manage this pest.

Influence of Chemigation Parameters on Fall Armyworm Control in Field Corn

1991 ◽  
Vol 74 (2) ◽  
pp. 280 ◽  
Author(s):  
Harold R. Sumner ◽  
Richard B. Chalfant ◽  
David Cochran
Keyword(s):  
Fall Armyworm ◽  
Field Corn

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.

Resistance in Maize to Euxesta stigmatias Loew (Diptera: Otitidae)2

2000 ◽  
Vol 35 (4) ◽  
pp. 432-443 ◽  
Author(s):  
B. T. Scully ◽  
G. S. Nuessly ◽  
R. L. Beiriger
Keyword(s):  
Spodoptera Frugiperda ◽  
Sweet Corn ◽  
Insect Pests ◽  
Empirical Relationship ◽  
Fall Armyworm ◽  
Maize Germplasm ◽  
Corn Silk ◽  
Field Corn ◽  
Maize Genotypes ◽  
Lepidoptera Noctuidae

The corn silk fly, Euxesta stigmatias Loew (Diptera: Otitidae), and related otitid species can cause severe crop losses to sweet corn, Zea mays L., grown in tropical and subtropical regions. In Florida, the fall armyworm, Spodoptera frugiperda J.E. Smith (Lepidoptera: Noctuidae), and E. stigmatias are two debilitating insect pests on the sweet corn ear that are considered the most costly and difficult to control. Our purpose was to search for resistance to the corn silk fly in a diverse set of maize germplasm that included sweet, floury, field and popcorn, and to determine if any empirical relationship existed between E. stigmatias damage and S. frugiperda infestation in corn ears. The overall means across two sites, 3 yrs and 16 genotypes was 1.77 for corn silk fly damage, rated on a 0 to 4 prototype scale, and 30.1% for fall armyworm infestation. Clear differences existed between the sweet and popcorn types when compared to the field and floury types. The field and floury corns sustained significantly less damage by the corn silk fly than the sweet and popcorn types (0.91 vs 3.33). Five of these genotypes, CEW-R58, DDSB, GT-RI4, Mp704 and ‘Zapalote Chico 2451’, had both lower corn silk fly damage ratings and lower levels of fall armyworm infestation. Across this broad germplasm base no statistical relationship was identified between corn silk fly damage and fall armyworm infestation, suggesting that each insect species responds independently to different maize genotypes. Husk extension was partly related to reduced S. frugiperda infestation, and tip tightness was partly related to reduced E. stigmatias damage. These results indicate that field corn could possibly serve as source of resistance to the corn silk fly for the improvement of sweet corn.

Evaluation of Corn Hybrids Expressing CrylF (Herculex® I Insect Protection) Against Fall Armyworm (Lepidoptera: Noctuidae) in the Southern United States

2008 ◽  
Vol 43 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Melissa Willrich Siebert ◽  
Kelly V. Tindall ◽  
B. Rogers Leonard ◽  
John W. Van Duyn ◽  
Jonathan M. Babcock
Keyword(s):  
Spodoptera Frugiperda ◽  
Zea Mays L ◽  
Larval Mortality ◽  
Fall Armyworm ◽  
Laboratory Studies ◽  
Insecticidal Crystal Protein ◽  
Corn Hybrids ◽  
Field Corn ◽  
Field Plots ◽  
Lepidoptera Noctuidae

Efficacy of two insect-resistant corn hybrids expressing the Cry1 F insecticidal crystal protein of Bacillus thuringiensis var. aizawai Berliner (transformation event TC1507) was evaluated against fall armyworm, Spodoptera frugiperda (J.E. Smith), in three southern U.S. locations. Larval susceptibility was evaluated on CrylF and nonBt field corn, Zea mays L., plants (V3–V12 and R1–R2 stages) in field plots and laboratory studies. Leaf-feeding injury was significantly less and plant height was significantly greater for hybrids containing Cry1 F as compared with nonBt corn hybrids when exposed to natural or artificial fall armyworm infestations. In addition, larval mortality was significantly greater on CrylF corn hybrids compared with that on nonBt hybrids. These results demonstrate that corn hybrids containing CrylF represent an effective plant incorporated insecticidal protein management option for fall armyworm. In environments where fall armyworm may exceed damage thresholds and have to be carefully managed with foliar sprays, utilization of CrylF corn hybrids will allow growers flexibility in planting and an efficient means for managing infestations.

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