Delayed efficacy of Beauveria bassiana foliar spray applications against Colorado potato beetle: Impacts of number and timing of applications on larval and next-generation adult populations

Wraight, Stephen P.; Ramos, Mark E.

doi:10.1016/j.biocontrol.2014.12.019

Cited by 24 publications

(22 citation statements)

References 44 publications

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“…Results from sampling of the CPB larval populations before and after application of the In accord with our findings from parallel studies conducted in 2006 (Wraight and Ramos, 2015), greatest expression of Beauveria efficacy occurred after the larvae entered the soil to pupate, ultimately resulting in greatly reduced emergence of next-generation adults (Fig. 2, Table 8).…”

Section: Field Testssupporting

confidence: 77%

“…Two field tests were conducted during the 2005 and 2006 field seasons using essentially the same protocols reported by Wraight and Ramos (2015). The test site was established to encompass a balanced incomplete block design comparing nine treatments in 12 blocks of three experimental units (plots) with four replications (Cochran and Cox, 1957).…”

Section: Research Plotsmentioning

confidence: 99%

“…Protocols for CPB population sampling, sampling of Bb spray deposits (conidia) on potato foliage, and assessment of crop damage (defoliation) were the same as described by Wraight and Ramos (2015). In 2005, larval populations were sampled 28 June and 5, 8, 11, and 13 July; defoliation damage was assessed on 18 July.…”

Section: Sampling Protocolsmentioning

confidence: 99%

“…The nine treatments and treatment combinations with their codes/abbreviations are summarized in Table 1. The sprayer was configured as described by Wraight and Ramos (2015) and operated at the "low pressure" of 345 kPa, delivering a volume of ca. 480 L/ha.…”

Section: Spray Applicationsmentioning

confidence: 99%

“…The test site was established to encompass a balanced incomplete block design comparing nine treatments in 12 blocks of three experimental units (plots) with four replications (Cochran and Cox, 1957). Potato plants, rows, plots, and blocks were established as described by Wraight and Ramos (2015), except that each 68-m-long block containing six plots was divided into two blocks of 34 m, each with three plots.…”

Section: Research Plotsmentioning

confidence: 99%

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Characterization of the synergistic interaction between Beauveria bassiana strain GHA and Bacillus thuringiensis morrisoni strain tenebrionis applied against Colorado potato beetle larvae

Wraight

Ramos

2017

Journal of Invertebrate Pathology

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Please cite this article as: Wraight, S.P., Ramos, M.E., Characterization of the synergistic interaction between Beauveria bassiana strain GHA and Bacillus thuringiensis morrisoni strain tenebrionis applied against Colorado potato beetle larvae, Journal of Invertebrate Pathology (2017), doi: http://dx.doi.org/10. 1016/j.jip.2017.01.007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. • Results indicated synergism of B. bassiana activity by B. thuringiensis toxinosis.• Speed of kill by the combined pathogens was no greater than that of Bt alone.• Consistent levels of synergism were observed under variable environmental conditions.• Results underscored the strong complementary action of the two biocontrol agents. AbstractStudies were undertaken to further characterize the previously identified synergistic activity of Bacillus thuringiensis-and Beauveria bassiana-based biopesticides against Colorado potato beetle (CPB). A flowable concentrate of B. thuringiensis morrisoni strain tenebrionis (Bt)(Novodor ® FC) and a wettable powder of B. bassiana strain GHA (Bb) (Mycotrol ® 22WP) were applied against CPB larval populations infesting potato in field plots. Novodor FC and an oildispersion formulation of Bb (Mycotrol ES) were applied against second-instar CPB larvae on potted potato plants in greenhouse tests under low relative humidity (RH), variable-temperature conditions. Each pathogen was applied alone and in combination (tank-mixed) with the other pathogen. In the field tests, each biopesticide was also combined with the spray-carrier (formulation without active ingredient) of the other pathogen. Results from the greenhouse tests showed that under warm, dry conditions, low activity of Mycotrol was counterbalanced by high activity of the Novodor, and under cool, somewhat more humid conditions, low Novodor activity was balanced by high activity of Mycotrol, with the result being a constant level of synergism 3 (CPB mortality ca. 20 percentage points higher than predicted by independent action). Similar levels of synergism were observed under the markedly different conditions of the field and greenhouse environments, and the synergism was confirmed as arising from interaction of the two micobes, as the Bt spray carrier had no significant effect on efficacy of the Mycotrol product and the Bb spray carrier had no effect on the efficacy of Novodor. The great capacity of these two control agents to act in concert to control CPB is well documented (the fast-acting, toxic Bt acting to protect potato crops from defoliation and the slow-acting Bb reducing survival to the adult stage). These finding further undersc...

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Section: Field Testssupporting

confidence: 77%

Section: Research Plotsmentioning

confidence: 99%

Section: Sampling Protocolsmentioning

confidence: 99%

Section: Spray Applicationsmentioning

confidence: 99%

Section: Research Plotsmentioning

confidence: 99%

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Characterization of the synergistic interaction between Beauveria bassiana strain GHA and Bacillus thuringiensis morrisoni strain tenebrionis applied against Colorado potato beetle larvae

Wraight

Ramos

2017

Journal of Invertebrate Pathology

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Effects of fluorine‐containing usnic acid and fungus Beauveria bassiana on the survival and immune–physiological reactions of Colorado potato beetle larvae

Kryukov

Tomilova

Luzina

et al. 2017

Pest Management Science

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Concepts and applications of foliar spray for microbial inoculants

Preininger

Sauer

Bejarano

et al. 2018

Appl Microbiol Biotechnol

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Damages of the (agro)ecosystem by extensive use of chemical fertilizers and pesticides, the global dying of bee populations possibly linked to pesticide spraying, and stricter regulations for pesticide use together with successful use of microbials in IPM programs are pushing on the development and commercialization of new microbial products and a large and growing biostimulants and biocontrol market. This review focuses on microbial inoculants including bacteria, fungi, and viruses used as biostimulant or biocontrol agent for foliar application and covers all important steps from inoculant development to successful field application. Topics presented comprise typical spraying equipment including the importance of the spraying process and relating effects, furthermore formulation development including classification and adjuvants, and thirdly regulatory aspects as currently applied or under discussion. Microbial inoculants for foliar spray reported in scientific literature are summarized and contrasted with selected commercial products. Special attention is given to factors most important in microbial spray: (a) type of active ingredient (bacteria, fungi, viruses), (b) mode of action (ingestion, contact, competition), (c) interaction with the plant leaf surface, (d) droplet size in terms of microbe concentration and leaf coverage, and (e) environmental conditions during spraying. Finally, we want to emphasize that timely administration is of utmost importance for successful spraying and maximum efficacy. This might be supported by weather stations and disease/pest models as an important step towards precision farming.

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Delayed efficacy of Beauveria bassiana foliar spray applications against Colorado potato beetle: Impacts of number and timing of applications on larval and next-generation adult populations

Cited by 24 publications

References 44 publications

Characterization of the synergistic interaction between Beauveria bassiana strain GHA and Bacillus thuringiensis morrisoni strain tenebrionis applied against Colorado potato beetle larvae

Characterization of the synergistic interaction between Beauveria bassiana strain GHA and Bacillus thuringiensis morrisoni strain tenebrionis applied against Colorado potato beetle larvae

Effects of fluorine‐containing usnic acid and fungus Beauveria bassiana on the survival and immune–physiological reactions of Colorado potato beetle larvae

Concepts and applications of foliar spray for microbial inoculants

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