Development of some lepidopterous cotton pests as affected by exposure to sublethal levels of endotoxins of Bacillus thuringiensis for different periods

Salama, H. S.; Foda, M. S.; Sharaby, A.; Matter, M. M.; Khalafallah, M. A.

doi:10.1016/0022-2011(81)90126-9

Cited by 32 publications

(27 citation statements)

References 13 publications

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“…is known to decrease food intake, retard larval development, reduce fecundity and longevity, reduce pupal/moth wt., decrease number of eggs laid and affect other growth indices in lepidopterans like S. littoralis, S. exigua, Heliothis armigera, Plutella xylostella, Helicoverpa armigera, Spilosoma obliqua, Pericalia ricini etc. (Salama et al 1981;Gupta & Rana 1991;Mathur et al 1994;Chandra et al 1998;Singh et al 2000). Efficacy of two subspecies of Bacillus thuringiensis on Spodoptera litura 907…”

Section: Resultsmentioning

confidence: 93%

Relative efficacy of two subspecies ofBacillus thuringiensis, available as commercial preparations in market, on different stages of a lepidopteran pest,Spodoptera litura(Fabricius)

Pandey

Joshi

Tiwari

2009

Archives Of Phytopathology And Plant Protection

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The present study compares the efficacy of two different subspecies of Bacillus thuringiensis viz. aizawai and kurstaki, available as commercial preparations in market against different stages of Spodoptera litura. Leaf-dip bioassay was done to calculate the LC 50 values of both the preparations, while microbiological analysis and total protein content estimation were also performed to co-relate the results. B. thuringiensis aizawai was found to be more effective (LC 50 values being 0.505, 1.121, 5.009, 6.706 for 1 st , 2 nd , 3 rd , and 4 th instar, respectively) than kurstaki (LC 50 values being 1.121, 3.974, 6.897, 9.471 for 1 st , 2 nd , 3 rd , and 4 th instar, respectively). The efficacy was found to depend upon the number of viable spores in a particular preparation as well as on the total protein content of that particular subspecies. The preparation containing B.t.a was more effective because its viable spore counts as well as total protein content values (at different time intervals) were higher as compared to the preparation containing B.t.k. The growth rates for both the subspecies were almost the same, which didn't seem to affect their efficacy on S. litura.

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Section: Resultsmentioning

confidence: 93%

Relative efficacy of two subspecies ofBacillus thuringiensis, available as commercial preparations in market, on different stages of a lepidopteran pest,Spodoptera litura(Fabricius)

Pandey

Joshi

Tiwari

2009

Archives Of Phytopathology And Plant Protection

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“…This phenomenon was reported for <5-endotoxin by some workers, e.g. Yamvrias (1962), van der Lean & Wassink (1964), Dulmage & Martinez (1973), Schesser & Bulla (1979), Afify et al (1980), Salama et al (1981), Mardan & Harein (1984), McGaughey (1986), Salama & Sharaby (1988), and for /?-exotoxin by others (Hitchings, 1967;Hornby & Gardner, 1987). The present study aims to determine the effect of sublethal concentrations of Dipel 2X® and /?-exotoxin (ABG-6162 A) of Bacillus thuringiensis on the biology and development of the two stored grain insects, the Indian meal moth Plodia interpunctella, and the Angoumois grain moth Sitotroga cerealella.…”

Section: Introductionmentioning

confidence: 73%

Biology and development of some stored grain pests as affected byδ‐endotoxin andβ‐exotoxin ofBacillus thuringiensis

Salama

Aboul-Ela

El-Moursy

et al. 1991

Biocontrol Science and Technology

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Exposure of Plodia interpunctella and Sitotroga cerealella to sublethal concentrations of Dipel 2X® (Bacillus thuringiensis var.kurstaki-HD-1) with its spores and endotoxin crystals led to an increase in the sum of larval-pupal duration. A decrease in moth emergence, egg production and fertility was observed with increase of Dipel 2X concentration, while the longevity of the moths was not affected by treatment. Sublethal concentrations of β-exotoxin (ABG-6162 A) had no significant effect on the sum of larval-pupal duration of either insect species. Percentage of moth emergence decreased with the increase of β-exotoxin concentrations. The longevity of both male and female adults of P. interpunctella and of females of S. cerealella were shorter at high concentrations. Egg production in P. interpunctella was reduced by all concentrations of the β-exotoxin, and hatching of eggs was reduced by concentrations of 15 ppm and above.

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“…Pedersen et al (1997) and Salama et al (1981) reported reduction of oviposition and egg fecundity to many insect species. Ramachandran et al (1993) observed no deleterious effect of Cry1Aa protein to pupae weight of C. fumiferana and Hyphantria cunea, suggesting that some effect may occur according to the Bt toxins.…”

Section: Resultsmentioning

confidence: 99%

“…Few studies evaluated the sublethal effects of Bt on larvae (Abdul-Sattar & Watson, 1982;Pedersen et al, 1997;Salama et al, 1981 andSharaby, 1988) due to difficulties to evaluate these parameters under field conditions. This work evaluated the effects of Bt isolates on larval and female pupae weight, oviposition and egg fecundity parameters in Spodoptera frugiperda larvae.…”

Section: Introductionmentioning

confidence: 99%

Biological parameters of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) assayed with Bacillus thuringiensis berliner

Polanczyk¹,

Alves²

2005

Sci. agric. (Piracicaba, Braz.)

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The bacterium Bacillus thuringiensis (Bt) is a promising control agent of Spodoptera frugiperda (J.E. Smith). Besides the lethal effect on hosts, the entomopathogen may cause physiological alterations that hinder insects' feeding intake and reproduction. Larval and female pupa weight, oviposition and egg fecundity were determined in second instar S. frugiperda larvae infected with 39 Bt isolates in four bioassays. Sublethal effects were observed in the follow isolates: ESALQ 1.1, ESALQ 1.4, ESALQ 1.6, ESALQ 3.7, ESALQ 4.2 and ESALQ 5.2 (larval and female pupae weight); ESALQ 5.1 (larval weight); ESALQ 1.2 and ESALQ 3.7 (egg fecundity); ESALQ 3.7 (oviposition and egg fecundity); ESALQ 3.7 and ESALQ 5.2 (oviposition). Significant correlations were observed when parameters were analyzed together, except in the second bioassay (female pupal weight × oviposition, female pupal weight × egg fecundity and oviposition × egg fecundity). Some Bt isolates affected the biological parameters of S. frugiperda, mainly larval and female pupae weight, and in some instances these effects were passed on to further life cycle stages affecting oviposition and egg fecundity. Although sublethal effects are difficult to evaluate, mainly under field conditions, they should be considered when the activity of an entomopathogen is measured.

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Development of some lepidopterous cotton pests as affected by exposure to sublethal levels of endotoxins of Bacillus thuringiensis for different periods

Cited by 32 publications

References 13 publications

Relative efficacy of two subspecies ofBacillus thuringiensis, available as commercial preparations in market, on different stages of a lepidopteran pest,Spodoptera litura(Fabricius)

Relative efficacy of two subspecies ofBacillus thuringiensis, available as commercial preparations in market, on different stages of a lepidopteran pest,Spodoptera litura(Fabricius)

Biology and development of some stored grain pests as affected byδ‐endotoxin andβ‐exotoxin ofBacillus thuringiensis

Biological parameters of Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) assayed with Bacillus thuringiensis berliner

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