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

Salama, H. S.; Aboul-Ela, R.; El-Moursy, A.; Abdel-Razek, A. S.

doi:10.1080/09583159109355207

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…A previous study of Bt-susceptible and -resistant Indianmeal moth colonies indicated no differences in development time or larval weight, but a substantial increase in mortality was observed in Bt-resistant colonies reared on diet that did not contain Bt (Johnson & McGaughey, 1996). Another study reported an increase in development time in moths fed sublethal concentrations of Bt subspecies kurstaki HD-1, and increased concentrations resulted in decreased moth emergence and fertility (Salama et al, 1991). Also in the Indianmeal moth, resistance to another microbial insecticide, a granulosis virus, was associated with lower egg viability, longer development time, and increased adult weight (Boots & Begon, 1993).…”

Section: Introductionmentioning

confidence: 95%

Fitness costs of resistance to Bacillus thuringiensis in the Indianmeal moth, Plodia interpunctella

Oppert¹,

Hammel²,

Throne³

et al. 2000

Entomologia Exp Applicata

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Genetic changes in insects that result in insecticide resistance can also affect their fitness. Here, we report measurements of development time and survival of the Indianmeal moth, Plodia interpunctella (Hübner), to compare the relative fitness of Bacillus thuringiensis (Bt)-susceptible and -resistant colonies. Measurements of larval development time and survival indicated that a fitness cost was associated with resistance to Bt in some Bt-resistant colonies but not others. Comparisons of geographically different populations revealed inherent differences in development time and survival. In most cases, Bt-resistant moths suffered no disadvantage when feeding on a Bt-treated diet. In many cases, the development of Bt-resistant moths on Bt-treated diet was slower than the unselected moths on untreated diet, but it is unclear whether these differences would affect the successful mating of susceptible and resistant moths.

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Section: Introductionmentioning

confidence: 95%

Fitness costs of resistance to Bacillus thuringiensis in the Indianmeal moth, Plodia interpunctella

Oppert¹,

Hammel²,

Throne³

et al. 2000

Entomologia Exp Applicata

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Effect of MON 810 Bt transgenic maize diet on stored-product moths (Lepidoptera: Pyralidae)

2008

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Bacillus thuringiensis (Bt) for the Control of Insect Pests in Stored Tobacco: A Review

Blanc¹,

Kaelin²,

Gadani³

2002

Beiträge Zur Tabakforschung International/Contributions to Tobacco Research

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Among the insect species causing infestations and serious damages to stored commodities, the cigarette beetle, Lasiodermaserricorne (F.) and the tobacco moth, Ephestiaelutella (Hübner) are the major pests of both raw and manufactured tobacco. Post-harvest tobacco control is achieved through sanitation, insect monitoring, and fumigation with phosphine. However, insect resistance to phosphine and control failures have been reported, and increasing regulatory pressure is being exerted on fumigants. Biological control agents such as Bacillus thuringiensis (Bt) appear to be environmentally sound and potentially viable alternatives to chemical control. Bt is a bacterium that produces insecticidal crystal proteins during the sporulation phase and has been, for more than 40 years, the microorganism of choice for the biocontrol of phytophagous insect pests. It produces insecticidal crystal proteins that display specific activity against certain orders of insects and become active upon ingestion by the insect. Our laboratory has conducted extensive research and worldwide surveys to evaluate the presence of Bt in stored tobacco and has confirmed previous findings indicating that Bt may be considered part of the naturally occurring phylloplanemicroflora. Several Bt strains were isolated from tobacco and characterized by DNA and protein profiling. The insecticidal activity of selected strains and of two commercial products against the larvae of L. serricorne was determined by diet incorporation assays. Moreover, the stability of Bt spores and crystal proteins on cured tobacco leaves was assessed over a storage period of time of 30 months. Cigarette prototypes were made with Bt-treated tobacco. Standard cigarette and smoke evaluations did not show any significant difference between the test and control cigarettes. Although the tested Bt strains and products did not yield satisfactory levels of mortality at the required times and doses, the experimental results summarized in the present review indicate that B. thuringiensishas potential for the control of the cigarette beetle. The integration of conventional control approaches with novel systems based on biological agents with different modes of action should offer new avenues for the effective management of stored tobacco pests in line with integrated pest management (IPM) concepts.

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

Cited by 3 publications

References 23 publications

Fitness costs of resistance to Bacillus thuringiensis in the Indianmeal moth, Plodia interpunctella

Fitness costs of resistance to Bacillus thuringiensis in the Indianmeal moth, Plodia interpunctella

Effect of MON 810 Bt transgenic maize diet on stored-product moths (Lepidoptera: Pyralidae)

Bacillus thuringiensis (Bt) for the Control of Insect Pests in Stored Tobacco: A Review

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