Interactions between Bacillus thuringiensis and Its Beta-Exotoxin in Fall Armyworm (Lepidoptera: Noctuidae) Neonate Larvae

1986 ◽  
Vol 69 (3) ◽  
pp. 531 ◽  
Author(s):  
Wayne A. Gardner ◽  
Andrew F. Pendley ◽  
Greggory K. Storey
Keyword(s):  
Bacillus Thuringiensis ◽  
Fall Armyworm ◽  
Neonate Larvae ◽  
Lepidoptera Noctuidae

scholarly journals Efficacy of Bacillus thuringiensis (Bt) maize expressing Cry1F, Cry1A.105, Cry2Ab2 and Vip3Aa20 proteins to manage the fall armyworm (Lepidoptera: Noctuidae) in Brazil

2020 ◽  
Vol 137 ◽  
pp. 105269 ◽  
Author(s):  
Valéria F. Moscardini ◽  
Luiz H. Marques ◽  
Antônio C. Santos ◽  
Jaédino Rossetto ◽  
Oscar A.B.N. Silva ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Fall Armyworm ◽  
Bt Maize ◽  
Lepidoptera Noctuidae

scholarly journals Biorational management of maize fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) using Bacillus thuringiensis (Berliner) enriched with chemical additives

2021 ◽  
Vol 13 (4) ◽  
pp. 1231-1237
Author(s):  
M. Priyanka ◽  
P. Yasodha ◽  
C.Gailce Leo Justin ◽  
J. Ejilane ◽  
Venugopal Rajanbabu
Keyword(s):  
Bacillus Thuringiensis ◽  
Boric Acid ◽  
Sodium Nitrate ◽  
Spodoptera Frugiperda ◽  
Seedling Emergence ◽  
Fall Armyworm ◽  
Invasive Pest ◽  
Chemical Additives ◽  
Stage Of Development ◽  
Lepidoptera Noctuidae

An invasive pest, fall armyworm, Spodoptera frugiperda (J.E.Smith) (Lepidoptera: Noctuidae) attacks maize at every stage of development, from seedling emergence up to cob formation. Early instar larvae were seen mostly on leaves of maize with characteristics pin or shot hole symptoms. Later instar larvae were confined to deep whorls, leaving typically ragged like appearance and fed on the reproductive stage of the crop especially tassels and developing cobs resulting in quality and quantity loss of maize produce. The effect of commercially available Bacillus thuringiensis subsp. kurstaki product, Dipel® against the second instar larvae of Fall Armyworm (FAW )was not promising under laboratory conditions. Hence, an effort was made to add an adjuvant along with B. thuringiensis to increase the virulence of commercially available B. thuringiensis.The Laboratory bioassays with B. thuringiensis and seven chemical additives ( T1- Bt + Boric acid, T2- Bt + Zinc oxide, T3- Bt + Sodium nitrate, T4- Bt + Peptone, T5- Bt + Urea, T6- Bt + EDTA, T7- Bt + Citric acid & T8-  Bt alone T9- Control) were tested against second instar larvae of Spodoptera frugiperda larvae. The results showed that B. thuringiensis plus sodium nitrate (T3) promoted maximum mortality 82.2 per cent with a minimum LC50 value of 54.620 mg/l. Sodium nitrate boosted B. thuringiensis activity at a concentration of 0.05 per cent by 2.128-fold than B. thuringiensis alone. Overall, sodium nitrate improved the efficacy of B. thuringiensis spray at the maximum level followed by boric acid, urea, EDTA and peptone.

Effect of Corn Foliar Cuticular Lipids on the Movement of Fall Armyworm (Lepidoptera: Noctuidae) Neonate Larvae

1993 ◽  
Vol 76 (2) ◽  
pp. 302 ◽  
Author(s):  
Guang Yang ◽  
Karl E. Espelie ◽  
B. R. Wiseman ◽  
David J. Isenhour
Keyword(s):  
Fall Armyworm ◽  
Cuticular Lipids ◽  
Neonate Larvae ◽  
Lepidoptera Noctuidae

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.

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