scholarly journals Baseline of Susceptibility to the Cry1F Protein in Mexican Populations of Fall Armyworm

2019 ◽  
Author(s):  
Maribel Rivero-Borja ◽  
J C Rodríguez-Maciel ◽  
J A Urzúa Gutiérrez ◽  
G Silva-Aguayo ◽  
Desmi I Chandrasena ◽  
...  
Keyword(s):  
Growth Inhibition ◽  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
San Luis ◽  
Geographical Populations ◽  
Percent Mortality ◽  
Neonate Larvae ◽  
Lepidoptera Noctuidae ◽  
Relative Inhibition ◽  
Mexican Populations

Abstract The fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), is currently the most important maize pest in Mexico. Its control is mainly based on the use of conventional insecticides. Additionally, Bt-maize expressing Cry1F protein represents an alternative to control this pest. We estimated the baseline susceptibility in Mexican populations of S. frugiperda to Cry1F protein. Twenty-eight geographical populations were field collected from Baja California Sur, Chihuahua, Coahuila, Durango, Sinaloa, Sonora, and Tamaulipas states. The F1 neonate larvae of each population were subjected to diet-overlay bioassay. After 7 d of Cry1F exposure, the percent mortality and the percent growth inhibition with respect to the untreated control were recorded (S-LAB). The LC50 ranged from 14.4 (6.3−24.0) (Cajeme 1, Sonora) to 161.8 ng/cm2 (92.0–320) (Ahumada 2, Chihuahua), while the LC95 was between 207.1 (145–363) (Obregón, Sonora) and 1,217 ng/cm2 (510.8–7,390.0) (Río Bravo 2, Tamaulipas). The sensitivity ratios at 50% mortality, (LC50 field/LC50 S-Lab) and 95% mortality were ≤6.45 and ≤5.05-fold, respectively. The 50% growth inhibition (GI50) ranged from 2.8 (0.008–9.3) (Obregón, Sonora) to 42.4 ng/cm2 (3.6–147.0) (Cajeme 1, Sonora). The GI95 was between 75.4 (San Luis Río Colorado, Sonora) to 1,198 ng/cm2 (Cajeme 1, Sonora). The relative inhibition at 50% of the growth, (RI50 = GI50 field /GI50 S-LAB) was ≤3.5 and at 95% (RI95) was ≤1.91-fold. These results indicated susceptibility to Cry1F protein in the evaluated populations of S. frugiperda.

scholarly journals Compatibility of indigenous isolates HR1, HR2 of entomopathogenic nematodes, with low-toxicity insecticides for control of fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) and tomato leafminer, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae)

2022 ◽  
Author(s):  
Indra Kumar Kasi ◽  
Mohinder Singh ◽  
Kanchhi Maya Waiba
Keyword(s):  
Invasive Species ◽  
Spodoptera Frugiperda ◽  
Entomopathogenic Nematodes ◽  
Fall Armyworm ◽  
Steinernema Feltiae ◽  
High Dose ◽  
Natural Ecosystems ◽  
Percent Mortality ◽  
Low Toxicity ◽  
Lepidoptera Noctuidae

Abstract Invasive species are a major danger to agronomic and natural ecosystems, and due to environmental concerns about pesticide use, EPNs have the potential to replace larvicidal action in pest management. The goal was to see how well local isolates of Steinernema feltiae (HR1) and Heterorhabditis bacteriophora (HR2) controlled invasive species when combined with low-toxicity pesticides. HR1 + Spinosad, chlorantraniliprole produced over 90% mortality in larvae at 96 hours, while HR2 + Spinosad, chlorantraniliprole caused over 95% mortality at 96 hours. After treatment, the high dose was regarded the least hazardous technique for controlling fall armyworm. At the high dose, HR1 + Spinosad, chlorantraniliprole produced larvae death of over 100 percent at 96 hours, and HR2 + Spinosad, chlorantraniliprole caused mortality of over 97.50 percent at 96 hours, and should be considered as a least hazardous strategy for T. absoluta management. Controlling larvae mortality of above 100% at 96 hours in combination with low-toxicity insecticide dosages should be included as a least harmful technique to control T. absoluta. The results showed that these HR2 strains have high pathogenicity against T. absoluta and S. frugiperda and have potential for control in integrated approaches, causing 100 percent and 90.00 percent mortality of T. absoluta and S. frugiperda at 96 hours at the high dose as a least toxic strategy to control.

Concentration–Mortality Response of Mexican Populations Fall Armyworm (Lepidoptera: Noctuidae) to Commercial Formulations of Bacillus Thuringiensis

2021 ◽  
Vol 56 (1) ◽  
pp. 70-83
Author(s):  
María del Carmen Lara-Becerra ◽  
Manuel Alejandro Tejeda-Reyes ◽  
Ángel Lagunes-Tejeda ◽  
Gonzalo Silva-Aguayo ◽  
J. Concepción Rodríguez-Maciel
Keyword(s):  
Bacillus Thuringiensis ◽  
Spodoptera Frugiperda ◽  
Zea Mays L ◽  
Fall Armyworm ◽  
Mortality Response ◽  
Important Pest ◽  
Median Lethal Concentrations ◽  
Lepidoptera Noctuidae ◽  
Laboratory Bioassays ◽  
Mexican Populations

Abstract The fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is the most economically important pest of maize (Zea mays L.) grown in Mexico. In order to identify biologically based management tactics for this pest, we determined the concentration–mortality response of 16 S. frugiperda populations collected in Mexico to two commercial formulations of Bacillus thuringiensis Berliner (Bt) (XenTari® [Bt subsp. aizawai] and DiPel® [Bt subsp. kurstaki]; Valent de México SA De CV, Jalisco, México). Laboratory bioassays established median lethal concentrations (LC50s) for each Bt formulation × population combination. We also determined mean larval weight 7 d after exposure and the number of larvae that reached the third instar of development. The populations were susceptible to both Bt formulations but they were, overall, more susceptible to Bt subsp. aizawai (XenTari) than to Bt subsp. kurstaki (DiPel). These results can serve as a reference to detect changes in S. frugiperda response to these Bt commercial products over time.

scholarly journals Impact of an Exotic Invasive Pest, Spodoptera frugiperda (Lepidoptera: Noctuidae), on Resident Communities of Pest and Natural Enemies in Maize Fields in Kenya

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1074
Author(s):  
Bonoukpoè Mawuko Sokame ◽  
Boaz Musyoka ◽  
Julius Obonyo ◽  
François Rebaudo ◽  
Elfatih M. Abdel-Rahman ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
Invasive Pest ◽  
Growth Stages ◽  
Insect Communities ◽  
Exotic Invasive Species ◽  
Before And After ◽  
Exotic Invasive ◽  
Lepidoptera Noctuidae

The interactions among insect communities influence the composition of pest complexes that attack crops and, in parallel, their natural enemies, which regulate their abundance. The lepidopteran stemborers have been the major maize pests in Kenya. Their population has been regulated by natural enemies, mostly parasitoids, some of which have been used for biological control. It is not known how a new exotic invasive species, such as the fall armyworm (FAW), Spodoptera frugiperda (Lepidoptera, Noctuidae), may affect the abundance and parasitism of the resident stemborers. For this reason, pest and parasitism surveys have been conducted, before and after the FAW invaded Kenya, in maize fields in 40 localities across 6 agroecological zones (AEZs) during the maize-growing season, as well as at 3 different plant growth stages (pre-tasseling, reproductive, and senescence stages) in 2 elevations at mid-altitude, where all maize stemborer species used to occur together. Results indicated that the introduction of the FAW significantly correlated with the reduction of the abundance of the resident communities of maize stemborers and parasitoids in maize fields; moreover, the decrease of stemborer density after the arrival of FAW occurred mostly at both reproductive and senescent maize stages. It also suggests a possible displacement of stemborers by FAW elsewhere; for example, to other cereals. However, since this study was conducted only three years after the introduction of the FAW, further studies will need to be conducted to confirm such displacements.

scholarly journals First record of a parasitoid, Megaselia (M) scalaris (Diptera: Phoridae) of fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) from India

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Sharanabasappa S. Deshmukh ◽  
S. Kiran ◽  
Atanu Naskar ◽  
Palam Pradeep ◽  
C. M. Kalleshwaraswamy ◽  
...  
Keyword(s):  
Outer Surface ◽  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
First Record ◽  
Instar Larva ◽  
Major Threat ◽  
Megaselia Scalaris ◽  
Maize Cultivation ◽  
First Time ◽  
Lepidoptera Noctuidae

AbstractThe fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), has become a major threat in maize cultivation since its invasion to India in 2018. The humpbacked fly, Megaselia scalaris (Loew) (Diptera: Phoridae), was recorded as a laboratory parasitoid of FAW, for the first time in India. Initially, 30–40 maggots of M. (M) scalaris emerged out from the dead pre-pupa and pupa of laboratory-reared FAW. The fly laid up to 15 eggs on the outer surface of 6th instar larva or pre-pupa of the FAW. The incubation period was 1–2 days. The fly had 3 larval instars which lasted 3–4 days and a pupal period of 10–11 days. The adults survived for 6–7 days.

Impact of Bt cotton on the immune system and histology of the midgut of the fall armyworm Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

2013 ◽  
Vol 63 (2) ◽  
pp. 185-197 ◽  
Author(s):  
Franklin M. Cunha ◽  
Valéria Wanderley-Teixeira ◽  
Jorge B. Torres ◽  
Álvaro A.C. Teixeira ◽  
Thiago J.S. Alves ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
Bt Cotton ◽  
Contributing Factors ◽  
Qualitative And Quantitative ◽  
Cry1ac Toxin ◽  
Cellular Immune ◽  
Natural Tolerance ◽  
Lepidoptera Noctuidae

Despite the efficiency of transgenic plants expressing Bacillus thuringiensis (Bt) toxins as insecticides against several lepidopterans, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is one species that presents low susceptibility to most Bt crops. This study investigated the effects of the Cry1Ac toxin expressed by Bt cotton in the midgut of S. frugiperda and its effects on the humoral and cellular immune responses. Three hypotheses were proposed and tested with contributing factors for the natural tolerance of S. frugiperda: (i) midgut regenerative cells are activated by the Cry1Ac toxin, and thus renew the epithelial cells damaged by the protein, (ii) Cry1Ac increased production of nitric oxide or phenoloxidase in the hemolymph, and (iii) there are qualitative and quantitative variations in the hemocyte levels of S. frugiperda. Caterpillars were reared using Bt cotton (Acala 90B) and non-Bt isolines (Acala 90), from the first to the fourth instar. The Bt cotton promoted elongation of the epithelial cells in the midgut of S. frugiperda caterpillars. Hence, evidence only supported the hypothesised increase of phenoloxidase (ii) and qualitative and quantitative differences in hemocyte levels (iii) in insects that were fed with Bt and non-Bt cotton. These parameters seem to explain the low susceptibility of S. frugiperda to Cry1Ac toxin and they are a viable set of responses for the evaluation of other xenobiotic factors.

scholarly journals Biology and Nutritional Indexes of Spodoptera frugiperda (Lepidoptera: Noctuidae) in Saccharine Sorghum

2019 ◽  
Vol 11 (4) ◽  
pp. 126
Author(s):  
Lauren M. Barcelos ◽  
Fabrício O. Fernandes ◽  
Caroline Lopes ◽  
Beatriz M. Emygdio ◽  
Ricardo Valgas ◽  
...  
Keyword(s):  
Life Cycle ◽  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
Biological Data ◽  
Egg Laying ◽  
Grain Production ◽  
Current Analysis ◽  
Suitable Host ◽  
Significant Difference ◽  
Lepidoptera Noctuidae

Saccharine sorghum has been analyzed as a supplementary prime matter for ethanol production, especially during the sugarcane off-season period. However, it has proven to be highly susceptible to insect attacks during the cultivation cycle. The fall armyworm should be emphasized due to its voracity and high damage capacity enhanced by feeding-caused decrease in photosynthetic area. Current analysis studies the biology and determines the nutritional indexes of Spodoptera frugiperda in saccharine sorghum. Cultivars of saccharine sorghum BRS 506, BRS 509 and BRS 511were evaluated. Duration and survival of the egg, caterpillar, pre-pupal and pupal phases were determined, coupled to weight of pupae and caterpillar, life span, fecundity and pre-egg laying period. Although S. frugiperda completed its life cycle on cultivars BRS 506 and BRS 511, egg-laying and egg feasibility rates were low, whereas insects did not lay eggs on cultivar BRS 509. There was no significant difference in feeding intake by S. frugiperda among these three sorghum cultivars. Results suggest that saccharine sorghum is not a suitable host for S. frugiperda. Biological data reveal that the three saccharine sorghum cultivars are recommended for the grain production system since the number of specimens of the next generation is low or null.

Fall Armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

2008 ◽  
pp. 1409-1412
Author(s):  
E. S. Krafsur ◽  
R. D. Moon ◽  
R. Albajes ◽  
O. Alomar ◽  
Elisabetta Chiappini ◽  
...  
Keyword(s):  
Spodoptera Frugiperda ◽  
Fall Armyworm ◽  
Lepidoptera Noctuidae

Spodoptera frugiperda. [Distribution map].

1985 ◽  
Author(s):  
Keyword(s):  
Central America ◽  
Spodoptera Frugiperda ◽  
Prince Edward Island ◽  
French Guiana ◽  
Fall Armyworm ◽  
Virgin Islands ◽  
Cayman Islands ◽  
Distribution Map ◽  
Lepidoptera Noctuidae ◽  
New Distribution

Abstract A new distribution map is provided for Spodoptera frugiperda (J. E. Smith) [Lepidoptera: Noctuidae] Fall armyworm. Attacks cereals and grasses, polyphagous NORTH AMERICA, Canada Manitoba New Brunswick Nova Scotia Ontario Prince Edward Island Information is given on the geographical distribution in Quebec, Mexico, USA, CENTRAL AMERICA, AND CARIBBEAN, Anguilla, Antigua, Bahamas, Barbados, Belize, Cayman Islands, Costa Rica, Cuba, Dominica, Dominican Republic, El Salvador, Grenada, Guadeloupe, Guatemala, Haiti, Honduras, Jamaica, Martinique, Montserrat, Nevis, Nicaragua, Panama, Puerto Rico, St. Croix, St. Kitts, St. Lucia, St. Vincent, Trinidad and Tobago, Virgin Islands, SOUTH AMERICA, Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, French Guiana, Guyana, Paraguay, Peru, Surinam, Uruguay, Venezuela, Israel.

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