Potential of different isolates of entomopathogenic fungi from Thailand as biological control agents against western flower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae)

Şengonça, Ç.; Thungrabeab, Malee; Blaeser, P.

doi:10.1007/bf03356162

Cited by 21 publications

(11 citation statements)

References 22 publications

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“…from 3.9 × 10 4 to 5.5 × 10 6 conidia/mL. The latter two values reported by Sengonca et al (2006) compare with our laboratory-based estimates for second instar S. dorsalis reared on cotton (i.e., within 95% CL from Table 1). However, higher LC 50 values were observed among S. dorsalis larvae exposed to B. bassiana in the present study, possibly due to its shorter developmental period compared with F. occidentalis.…”

Section: Discussionsupporting

confidence: 89%

“…However, higher LC 50 values were observed among S. dorsalis larvae exposed to B. bassiana in the present study, possibly due to its shorter developmental period compared with F. occidentalis. The difference in host plant used in the present laboratory studies and those of Sengonca et al (2006) may have influenced the results. Thungrabeab et al (2006) reported that F. occidentalis reared on cotton were significantly less susceptible to infection by B. bassiana compared with those reared on bean plants, ostensibly due to sequestered gossypol and/or other allelochemicals in the cotton plants (Poprawski and Jones 2000).…”

Section: Discussionmentioning

confidence: 56%

“…Brownbridge (1995) tested more than 150 isolates and concluded that M. brunneum , B. bassiana , and Lecanicillium lecanii R. Zare and W. Gams had the highest level of insecticidal activity. Sengonca et al (2006) tested 41 isolates from 25 species and 11 genera of entomopathogenic fungi in Thailand against first instar F. occidentalis on bean leaves. Among the 14 most virulent isolates, LC 50 values of Beauveria spp.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have evaluated entomopathogenic fungi for use against western flower thrips, Frankliniella occidentalis Pergande, and other pest thrips (Vestergaard et al 1995; Jacobson et al 2001; Sengonca et al 2006; Thungrabeab et al 2006; Ansari et al 2007, 2008). However, there is little information on the effectiveness of entomopathogenic fungi against S. dorsalis.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Entomopathogenic Fungi Against Chilli Thrips,Scirtothrips dorsalis

Arthurs

Aristizábal

Avery

2013

Journal of Insect Science

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Commercial strains of entomopathogenic fungi were evaluated for control of chilli thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae), an invasive pest of ornamental and vegetable plants in the Caribbean and southeastern United States. In laboratory assays, LC50 values against adult S. dorsalis were 5.1 × 104 CFU/mL for Beauveria bassiana GHA, with higher values 3.1 × 105 for Metarhizium brunneum F52 and 3.8 × 105 for Isaria fumosorosea Apopka 97. Second instars were comparatively less susceptible to all isolates, ostensibly due to moulting, with LC50 values of 1.1 × 108, 7.0 × 105, and 9.9 × 105 CFU/spores per mL for GHA, F52, and Apopka 97 strains, respectively. In greenhouse cages, compared with controls, three applications of mycoinsecticides and other biorational insecticides at 7 to 14 day intervals reduced overall S. dorsalis populations on pepper plants Capsicum annuum cv. California Wonder: spinosad reduced populations by 94–99%, M. brunneum F52 by 84–93%, B. bassiana GHA by 81–94%, I. fumosorosea PFR-97 by 62–66%, and different horticultural oils by 58–85%. The proportion of marketable fruit was significantly increased by M. brunneum F52, B. bassiana GHA, and 2% SuffOil-X treatments. Slightly lower levels of control were observed in nursery tests with ornamental rose shrubs, Rosa sp. Red Double Knock Out®, during hot sunny conditions. Four applications reduced thrips populations over 10 weeks: spinosad by an average of 91%, M. brunneum F52 by an average of 81%, B. bassiana GHA by an average of 62%, SuffOil-X by an average of 50%, and I. fumosorosea PFR-97 by an average of 44%. The data show that mycoinsecticides can be used in management strategies for low to moderate populations of S. dorsalis and provide resistance management tools for the limited number of insecticides that are effective against this pest.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Entomopathogenic Fungi Against Chilli Thrips,Scirtothrips dorsalis

Arthurs

Aristizábal

Avery

2013

Journal of Insect Science

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“…40 hours following spray applications would support sufficient fungal 103 activity to achieve control. In addition to B. bassiana, various species/strains of Metarhizium 104 5have been found virulent against WFT (Gouli et al, 2009;Sengonca et al, 2006, Niassy et al 105 2012. Fungi of the genus Metarhizium are generally more tolerant of high-temperatures than 106Beauveria (Roberts and Campbell, 1977;Inglis et al, 1997), and because greenhouse humidity 107 and temperature are closely interrelated (with lowest humidities associated with daytime high-108temperature conditions), Metarhizium species were included as major study subjects.…”

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confidence: 99%

Efficacy of spray applications of entomopathogenic fungi against western flower thrips infesting greenhouse impatiens under variable moisture conditions

et al. 2016

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37Laboratory bioassays of three entomopathogenic fungi (Beauveria bassiana strain GHA, 38Metarhizium brunneum strain F52, and Metarhizium anisopliae s.l. strain ESC-1) were 39 conducted against 2 nd -instar nymphs of Frankliniella occidentalis. All three fungi were highly 40 virulent, with respective LC 50 s of 193, 140, and 72 conidia/mm 2 of treated leaf surface. Efficacy 41 tests were conducted against thrips infesting small plots of Impatiens walleriana on open 42 greenhouse benches under variable moisture conditions. Multiple spray applications of fungal 43 conidia suspended in 0.01% Silwet ® were made at a high rate of 2 x 10 14 conidia/ha at 3-5-day 44 intervals, and efficacy was assessed from twice-weekly samples of both flowers and foliage. 45During tests, moisture conditions were modified via controlled sprays of water onto the concrete 46 floor beneath the greenhouse benches for a period of ca. 40 h (from the evening through the 47 © 2016. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 3 prevented pest populations from increasing. Aspects of the impatiens crop that create a challenge 59 for thrips control using fungal entomopathogens are described and discussed. 60 Key Words: Beauveria bassiana, Metarhizium spp.; greenhouse efficacy; Frankliniella 61 occidentalis; moisture conditions; relative humidity 62 63 1. Introduction 64 65 In previous greenhouse studies investigating the efficacy of the fungal pathogen Beauveria 66 bassiana strain GHA (formulated as BotaniGard ® 22WP) against western flower thrips 67 Frankliniella occidentalis (Pergnade) (WFT) infesting greenhouse cultures of impatiens, we 68were unable to achieve effective levels of control. A primary hypothesis from the study was that 69 greenhouse conditions were too dry to support fungal activity (Ugine et al., 2007a). Most of the 70 tests were conducted in large greenhouse bays with effective sun-screens and efficient 71 evaporative cooling systems. In one test conducted during the summer months, mean 72 temperature was 21 ºC and overall relative humidity averaged > 80%. Such conditions would 73 seem favorable for fungal activity against thrips, and yet, the pest populations were reduced just 74 32%. This suggests that daytime periods of reduced humidities, elevated temperatures, and high 75 ventilation (to control temperature) had a strong negative impact on fungal efficacy. Little is 76 known of the combined effects of these factors on fungal efficacy. Movement of air has a 77 marked effect on its drying capacity and is difficult to control and quantify for experimentation, 78 particularly above and within a crop canopy. Effects of ventilation on phylloplane microclimate 79 add an additional level of complexity (see Jaronski, 2010). In studies of effects of moisture 80 conditions on B. bassiana infection of Rhodnius prolixus, Luz and Fargues (1999) demonstrated 81 4 that infection was dependent upon a near-saturation moisture threshold of 96%, and Fargues and ...

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Biological Control of Microbial Plant Pathogens in Alternative Sources of Infection

Narayanasamy¹

2013

Biological Management of Diseases of Crops

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Potential of different isolates of entomopathogenic fungi from Thailand as biological control agents against western flower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae)

Cited by 21 publications

References 22 publications

Evaluation of Entomopathogenic Fungi Against Chilli Thrips,Scirtothrips dorsalis

Evaluation of Entomopathogenic Fungi Against Chilli Thrips,Scirtothrips dorsalis

Efficacy of spray applications of entomopathogenic fungi against western flower thrips infesting greenhouse impatiens under variable moisture conditions

Biological Control of Microbial Plant Pathogens in Alternative Sources of Infection

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