Survival of Tobacco Budworm (Lepidoptera: Noctuidae) Larvae after Short-Term Feeding Periods on Cotton Treated with Bacillus thuringiensis1

Ali, Abdul-Sattar A.; Watson, T. F.

doi:10.1093/jee/75.4.630

Cited by 11 publications

(2 citation statements)

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“…Except for a study by Oatman & Legner (1964) reporting an increase in overwintering mortality of Spilonota ocellana Denis & Schiffermüller (Lepidoptera: Tortricidae), most studies have dealt with the effects of parental exposure to Btk on egg hatch. Ali & Watson (1982) for H. virescens and Dubois et al . (1988) for L. dispar reported that egg hatch was not negatively affected by Btk exposure of the parents.…”

Section: Introductionmentioning

confidence: 83%

Carry over effects of the entomopathogen Bacillus thuringiensis ssp. Kurstaki on Choristoneura fumiferana (Lepidoptera: Tortricidae) progeny under various stressful environmental conditions

Bauce

Carisey

Dupont

2006

Agri and Forest Entomology

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1 In the present study, we documented the lethal and sublethal effects of the entomopathogen Btk on spruce budworm and its progeny under various environmental conditions. We hypothesized that aerial spray of Bacillus thuringiensis ssp. kurstaki (Btk) could affect the biological performance of the surviving spruce budworm (Choristoneura fumiferana Clem.) populations and their progenies and that Btk sublethal effects could be widened by other types of stress (i.e. temperature conditions and changes in food suitability from year to year). 2 The results from a 3-year field experiment indicated that Btk treatments decreased the fitness of the surviving larvae whatever the prevailing temperature and nutritional conditions. 3 The detrimental Btk effects on the parental generation carried over to the offspring. The percent of egg hatch and first-instar survival were negatively affected by Btk whatever other stress spruce budworm parents underwent. 4 The present study also highlighted the fact that the effects of temperature and nutritional stress suffered by the parents could carry over to the next generation. Balsam fir flowering, which provided larvae with pollen rich in nitrogen, favoured both the parental generation and the fitness of their offspring. Spruce budworm mothers allocated to their progenies large amounts of energy reserves (triglycerides and glycogen) that greatly enhanced the survival of the early stages. 5 Egg hatch and the survival of first-instar larval progeny were drastically affected when their parents had reduced larval growth as a result of exposure to cool temperatures that had desynchronized insect and bud phenology. 6 Budworm mothers submitted to negative impacts of previous defoliation allocated low amounts of energy reserves to their progeny. This lack of energy associated with unfavourable temperature conditions (i.e. high temperatures in late summer and in early fall and an extended cool period in spring) drastically reduced survival of diapausing second-instar larvae. 7 These results highlight the importance of considering the various sources of stress when attempting to evaluate the impact of a control agent on an insect pest population and its progenies.

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Section: Introductionmentioning

confidence: 83%

Carry over effects of the entomopathogen Bacillus thuringiensis ssp. Kurstaki on Choristoneura fumiferana (Lepidoptera: Tortricidae) progeny under various stressful environmental conditions

Bauce

Carisey

Dupont

2006

Agri and Forest Entomology

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“…The pH and activity of digestive enzymes required to proteolytically activate the *-endotoxin (Falcon, 1971) in the insect gut may also differ among different instars. Bt inhibits larval feeding but at sub-lethal doses larvae may recover from initial exposure (Ali and Watson, 1982;Fast and Regniere, 1984) and continue feeding unless further treatment is applied. Bt is most effective against newly hatched larvae of H. armigera, a high percentage of which is present in tomato crop, persistence and stability of the material in spray is important for the effective control.…”

Section: Discussionmentioning

confidence: 99%

Shelf Life and Field Evaluation of CAMB Bacillus thuringiensis Biopesticide Against Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) on Tomato

Zafar¹,

Karim²,

Nasir³

et al. 2000

Pakistan J. of Biological Sciences

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Previous lab report (Karim et al., 1999) had shown the efficacy of CAMB Bacillus thuringiensis preparation in potato field to control Helicoverpa armigera. In present study, CAMB Bt formulations based on locally isolated Bt strain were checked against 1st to 4th instar larvae of H. armigera by incorporating Bt proteins into artificial diet. Early instars showed significant susceptibility to Bt formulation. Laboratory assays of stored CAMB Bt formulations did not show any significant change in their toxicity towards H. armigera larvae in laboratory assays. Potency of stored Bt formulations for 12 and 24 months were also tested in small scale experiment conducted under contained conditions on tomato crop. All formulations were found effective to control H. armigera larvae in tomato crop. The present study shows that CAMB Bt formulation can be used in field applications to control target pests after long storage time.

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Potential of Bacillus thuringiensis in the Management of Pernicious Lepidopteran Pests

Khan

Paul

Ahmad

et al. 2016

Plant, Soil and Microbes

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Microbial products have a long history of safe use and most of the microbial agents are compatible with other methods of pest control. A number of microbial biopesticides have been registered for fi eld application on various vegetables, fruits, and other crops of agricultural, horticultural, and forest importance. During sporulation phase, Bacillus thuringiensis accumulates certain insecticidal crystal proteins which are pathogenic to a number of insect orders. Thousands of toxicogenic strains of B. thuringiensis exist and each strain produces its own unique well-known insecticidal crystal protein. B. thuringiensis is biodegradable and safe to nontarget organisms as the conditions required for complex steps in the mode of action do not exist in mammals or most of invertebrates. Development of agricultural crop varieties that contain B. thuringiensis proteins provides a safe alternative to the use of chemical insecticides. Tobacco and tomato were the fi rst transgenic plants encoding for B. thuringiensis insecticidal crystal protein. The development of resistance to B. thuringiensis toxins is, however, particularly unfortunate. Thousands of B. thuringiensis isolates are available around the world, and fortunately almost all the major insect pests are susceptible to these strains. Moreover synthetic insecticides in combination with biopesticides are economic, 278 effective, and eco-friendly. The aim of this chapter is to focus on the potentiality of B. thuringiensis in the management of pernicious lepidopteran pests and their mode of their interactions to develop the cost-effective medium for the formulation of biopesticides.

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Survival of Tobacco Budworm (Lepidoptera: Noctuidae) Larvae after Short-Term Feeding Periods on Cotton Treated with Bacillus thuringiensis1

Cited by 11 publications

References 0 publications

Carry over effects of the entomopathogen Bacillus thuringiensis ssp. Kurstaki on Choristoneura fumiferana (Lepidoptera: Tortricidae) progeny under various stressful environmental conditions

Carry over effects of the entomopathogen Bacillus thuringiensis ssp. Kurstaki on Choristoneura fumiferana (Lepidoptera: Tortricidae) progeny under various stressful environmental conditions

Shelf Life and Field Evaluation of CAMB Bacillus thuringiensis Biopesticide Against Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) on Tomato

Potential of Bacillus thuringiensis in the Management of Pernicious Lepidopteran Pests

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