scholarly journals Susceptibility of Alabama argillacea and Chrysodeixis includens (Lepidoptera: Noctuidae) larvae to Beauveria bassiana associated with kaolin

2020 ◽  
Author(s):  
J. S. Galdino ◽  
C. A. D. Silva ◽  
J. C. Zanuncio ◽  
M. A. Castellani
Keyword(s):  
Beauveria Bassiana ◽  
Leaf Disc ◽  
Nutritional Ecology ◽  
First Instar ◽  
Additive Action ◽  
Alabama Argillacea ◽  
Simultaneous Management ◽  
Lepidoptera Noctuidae ◽  
Fungus Beauveria Bassiana ◽  
Chrysodeixis Includens

Abstract The mortality of the Alabama argillacea and Chrysodeixis includens (Lepidoptera: Noctuidae) larvae caused by the kaolin inert powder and the entomopathogenic fungus Beauveria bassiana were determined under laboratory conditions. Using the caterpillar submersion method, the CG 138 B. bassiana isolate was more pathogenic to A. argillacea than the CG 70, GC 82, ESALQ 634, and ESALQ 645. All five tested isolates caused similar mortality of C. includens. The mortality of first-instar larvae of A. argillacea and C. includens by feeding on leaf-disc impregnated with B. bassiana (CG 138) and kaolin was also determined. Higher A. argillacea mortalities were observed in the B. bassiana (CG 138) treatments, regardless of the presence of kaolin. However, the activity of kaolin + B. bassiana (CG 138) against C. includens was higher than each ingredient alone, indicating an additive action against C. includes larvae. The mortality of A. argillacea and C. includens larvae treated with kaolin + B. bassiana (CG 138) was similar, and the A. argillacea mortality was higher than that of C. includens with kaolin and B. bassiana (GC 138) separated. The treatment kaolin + B. bassiana (CG 138) is promising for the simultaneous management of these two defoliator pests, mainly A. includes. In addition, the monophagous A. argillacea is more susceptible to both kaolin and B. bassiana (GC 138) than the polyphagous C. includens, suggesting that the nutritional ecology plays an important role in the susceptibility of these defoliator species to alternative insecticides.

scholarly journals Selection of Metarhizium anisopliae (Metsch.) and Beauveria bassiana (Bals.) isolates to control Alabama argillacea (Huebner) caterpillars

2002 ◽  
Vol 59 (3) ◽  
pp. 457-462 ◽  
Author(s):  
Everardo César Filho ◽  
Edmilson Jacinto Marques ◽  
Reginaldo Barros
Keyword(s):  
Beauveria Bassiana ◽  
Metarhizium Anisopliae ◽  
Integrated Control ◽  
Gossypium Hirsutum L ◽  
Alabama Argillacea ◽  
Lethal Time ◽  
Beauveria Bassiana Isolates ◽  
Lepidoptera Noctuidae ◽  
Mortality Percentage ◽  
Selection Of

The cotton leafworm, Alabama argillacea (Huebner, 1818) (Lepidoptera: Noctuidae), is considered to be one of the key pests in herbaceous cotton (Gossypium hirsutum L. r. latifolium Hutch) cropping, with constant occurrence in all cotton-growing states of Brazil. In this study Metarhizium anisopliae and Beauveria bassiana isolates were screened and evaluated for pathogenicity against Alabama argillaceae. Initially, a screening of ten isolates of each fungus in a concentracion of 10(8) conidia mL-1, was carried out on 3rd instar larvae of A. argillacea. Further studies were conducted to determine the pathogenicity and virulence of six and seven isolates of M. anisopliae and B. bassiana, respectively, against 3rd instar larvae of A. argillacea and using the concentrations of 10(6), 10(7), 10(8), and 10(9) conidia mL-1. The experiments were carried out in Recife, PE, Brazil, at 27 ± 2ºC, RH 70 ± 5% and a photophase of 12 hours. Mortalities caused by M. anisopliae isolate at the different concentrations ranged from 4.5 to 91.2%, the highest mortality percentage being found for the isolate 1189 at 10(9) conidia mL-1. The isolate 645 of B. bassiana caused the highest mortality at the highest concentration, followed by isolates 634, 604, and IPA 198. The lowest lethal time for B. bassiana and M. anisopliae, was achieved by the isolates 483 (4.1 days) and 1189 (2.0 days), respectively. The isolates 1189, 1022 e 866 of M. anisopliae and 483, IPA198 and 604 of B. bassiana, at 10(8) e 10(9) conidia mL-1 are promissing for use the integrated control of A. argillacea larvae, but M. anisopliae seems more effective.

Effects of combining Beauveria bassiana and Nosema pyrausta on the mortality of Ostrinia nubilalis

2010 ◽  
Vol 5 (4) ◽  
pp. 472-480 ◽  
Author(s):  
Khaled Abdel Rahman ◽  
Marek Barta ◽  
Ľudovít Cagáň
Keyword(s):  
Beauveria Bassiana ◽  
Ostrinia Nubilalis ◽  
Egg Production ◽  
European Corn Borer ◽  
Fourth Instar ◽  
Combined Effects ◽  
High Concentration ◽  
Corn Borer ◽  
First Instar ◽  
Fungus Beauveria Bassiana

AbstractWe tested the combined effect of the fungus Beauveria bassiana and the microsporidium Nosema pyrausta on the European corn borer larvae, Ostrinia nubilalis, in the laboratory. The first instar of O. nubilalis larvae was the most sensitive to the B. bassiana infection followed by the fifth, second, third, and fourth instar (LC50s were 4.91, 6.67, 7.13, 9.15, and 6.51 × 105 conidia/ml for the first to fifth instars, respectively). Mortality of each instar increases positively with concentration of conidia. When B. bassiana and N. pyrausta were used in combination, mortality increased significantly in all instars. Relative to the B. bassiana treatment alone, the B. bassiana + N. pyrausta treatment decreased the LC50s by 42.16%, 37.63%, 21.60%, 27.11%, and 33.95% for the first to fifth instars, respectively. The combined effects of the two pathogens were mostly additive. However, at the two highest concentrations the pathogens interacted synergistically in the first and second instar. Individuals that survived the B. bassiana and B. bassiana + N. pyrausta treatments and developed into adults had significantly shorter lifespans and females oviposited fewer eggs than non-exposed insects. The effects on the longevity and the egg production were most pronounced at high concentration of B. bassiana conidia.

scholarly journals AGENTES MICROBIANOS NO CONTROLE DE ALABAMA ARGILLACEA (HUEBNER, 1818) (LEPIDOPTERA: NOCTUIDAE) EM ALGODOEIRO

2007 ◽  
Vol 74 (1) ◽  
pp. 23-27
Author(s):  
G.L.M. Martins ◽  
L.C.T. Maruyama ◽  
W.I. Maruyama
Keyword(s):  
Bacillus Thuringiensis ◽  
Beauveria Bassiana ◽  
Alabama Argillacea ◽  
Lepidoptera Noctuidae

RESUMO O objetivo deste trabalho foi avaliar a eficiência de agentes microbianos no controle de Alabama argillacea na cultura de algodoeiro. O experimento foi instalado no Município de Cassilândia, MS, em cultivar BRS 200 Marrom. O delineamento experimental foi o de blocos ao acaso com 5 tratamentos e 4 repetições. Os tratamentos utilizados foram: 1Testemunha; 2-Beauveria bassiana (2 kg/ha) na concentração de 105 conídios/mL; 3-Metharizium anisopliae (2 kg/ha) na concentração de 105 conídios/mL; 4-Bacillus thuringiensis (0,5 L/ha); 5Mistura (B. bassiana (2 kg/ha) + M. anisopliae (2 kg/ha) + B. thuringiensis (0,5 L/ha). A viabilidade de B. bassiana e M. anisopliae foi de 85%. Realizouse a contagem das lagartas vivas encontradas em 20 plantas por parcela antes da aplicação (prévia) e as observações foram realizadas aos 3, 6 e 10 dias após a aplicação (DAA). Na avaliação realizada aos 3 DAA foi observada as menores eficiências dos agentes. Porém, na avaliação feita aos 10 d.a.a os tratamentos B. bassiana, M. anisopliae, B. thuringiensis e Mistura apresentaram eficiências de 77, 68, 84 e 86%, respectivamente.

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