Dosage-mortality studies with commercial Bacillus thuringiensis sprayed in a modified Potter's tower against some forest insects

Morris, O. N.

doi:10.1016/0022-2011(73)90018-9

Cited by 19 publications

(5 citation statements)

References 22 publications

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“…Although differences in bioassay methodology used for the different instars could explain differences in toxicity, it is most likely that size differences accounted for the higher toxicity to neonate larvae. Increased susceptibility to B. thuringiensis in early instars has been reported for other lepidopteran larvae (Morris 1973). Differences in sus- ceptibility related to size are not unexpected; more interesting are situations where larger larvae are more susceptible than smaller neonates.…”

Section: Discussionmentioning

confidence: 61%

Insecticide Susceptibility of Three Species of Cutworm (Lepidoptera: Noctuidae) Pests of Grapes

et al. 2013

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Climbing cutworms in the genus Abagrotis are economically important pests of grapes in the Okanagan Valley of British Columbia (BC). Grapes are recently introduced into many areas of the region, and the association between crop and pest is new and still evolving. This has led to limited information being available on pest management strategies, including the evaluation of chemical controls compatible with local production practices. Few insecticides are currently registered in Canada for cutworm control on grapes, and our study was initiated to provide information on the efficacy of potential control materials. We were also interested in the relative susceptibilities of the three most common cutworm species attacking grape buds in BC--Abagrotis orbis (Grote), Abagrotis reedi Buckett, and Abagrotis nefascia (Smith). Dose-response bioassays with nine insecticides were conducted on neonate larvae using Bok Choy leaf disks, and on fourth-instar larvae using diet incorporation. There were considerable differences in the toxicity of insecticides within species for neonates and fourth instars. For some materials, the relative toxicity to neonates and fourth instars were not correlated. Response to insecticides among the three species showed variation as well, and correct identification of the species complex present in individual locations is important in choosing the best available control material.

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Section: Discussionmentioning

confidence: 61%

Insecticide Susceptibility of Three Species of Cutworm (Lepidoptera: Noctuidae) Pests of Grapes

et al. 2013

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“…More recently, the availability of new strains and new more concentrated formulations as well as empirically determined improvements in application guidelines have combined to yield more consistently satisfactory results (Morris 1981). Morris (1973) as would be expected on the basis of their weight. being applied to the forest for spruce budworm control appears to be marginal (Fast 1976a,b) and a reinvestigation of the dose-response relationships of larvae of this insect appear to be warranted.…”

Section: Introductionmentioning

confidence: 57%

STRUCTURAL DAMAGE BY RHINOCYLLUS CONICUS (COLEOPTERA: CURCULIONIDAE) WITHIN THE FLOWERHEADS OF NODDING THISTLE

Shorthouse

Lalonde

1984

Can Entomol

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Can. Ent. 116: 131-137 (1984) Diet incorporation assays detected no difference in susceptibility of instars IV, V, and VI of spruce budworm exposed to Bacillus thuringiensis, either in terms of dose, LC50, or time, LT50. The hypothesis that the dose-response for larvae of each instar fitted a common regression line was statistically acceptable. Differences in the pattern of changes in larval weight of instars IV, V, VI larvae in response to dose were not detected.Small plots were sprayed with 5.5, 10.9, 21.9 BIU/ha at times corresponding to peak instar 111, early IV, peak IV, peak V, and peak VI. Instar 111 larvae were controlled less effectively than were instar IV or V larvae which were controlled equally well. Instar VI larvae were also less effectively controlled than instar IV and V larvae probably because a significant proportion had reached the non-feeding prepupal stage before the full effect of B.t. was obtained. ResumeAucune diffkrence de vulnCrabilitC en fonction de la dose, CL50, et du temps, TL50, n'a Ct C dtcelCe chez des lanes de la tordeuse des bourgeons de 1'Cpinette du 4. au 6. stades soumises a un rCgime alimentaire contenant Bacillus thuringiensis. A l'analyse groupCe des rksultats obtenus pour chaque stade, l'hypothese d'une droite commune de rkgression Ctait statistiquement acceptable. On n'a pas d6celC de diffkrence dans I'tvolution pondkrale des larves en fonction de la dose.Sur des parcelles traitkes avec 5.5, 10.9 et 21.9 U.I./ha a divers moments correspondant au maximum du 3e stade, au dCbut du 4. stade, au maximum du 4, au maximum du 5' et au maximum du 6., les larves du 3e stade ont Ct C moins bien rCprimCes que celles des 4 et 5' stades. Mtme constat pour les larves du 6. stade, peut-ttre pace qu'une partie notable d'entre elles ont cessC de se nourir avant de mCtamorphoser aux chrysalides, avant que B.t. ne fasse completement effet.

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“…Morris ( 1973 ) reported that larvae of forest pests Lymantria dispar (L.) when fed at Dipel-treated diet gained weight at a considerably slower rate as compared to the untreated ones. Reduction in larval weight intensifi ed as dosages of microbe were increased.…”

Section: Larval Growth and Developmentmentioning

confidence: 99%

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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Dosage-mortality studies with commercial Bacillus thuringiensis sprayed in a modified Potter's tower against some forest insects

Cited by 19 publications

References 22 publications

Insecticide Susceptibility of Three Species of Cutworm (Lepidoptera: Noctuidae) Pests of Grapes

Insecticide Susceptibility of Three Species of Cutworm (Lepidoptera: Noctuidae) Pests of Grapes

STRUCTURAL DAMAGE BY RHINOCYLLUS CONICUS (COLEOPTERA: CURCULIONIDAE) WITHIN THE FLOWERHEADS OF NODDING THISTLE

Potential of Bacillus thuringiensis in the Management of Pernicious Lepidopteran Pests

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