Temperature tolerance and humidity requirements of select entomopathogenic fungal isolates for future use in citrus IPM programmes

Acheampong, M A; Coombes, Candice A; Moore, Sean D; Hill, Martin P

Title: Temperature tolerance and humidity requirements of select entomopathogenic fungal isolates for future use in citrus IPM programmes
Creator: Acheampong, M A
Creator: Coombes, Candice A
Creator: Moore, Sean D
Creator: Hill, Martin P
Subject: To be catalogued
Date Issued: 2020
Date: 2020
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/419399
Identifier: vital:71641
Identifier: xlink:href="https://doi.org/10.1016/j.jip.2020.107436"
Description: Several isolates of Beauveria bassiana (Balsamo-Crivelli) Vuillemin (Hypocreales: Cordycipitacae) and Metarhizium anisopliae (Metchnikoff) Sorokin (Hypocreales: Clavicipitacae) have been investigated as possible microbial control agents of key citrus pests in South Africa. Although laboratory results have been promising, field trials against foliar pests have shown limited success. These findings highlighted the need to investigate other biological attributes of these fungal isolates besides virulence in order to select candidates that may be better suited for the foliar environment. Thus, this study investigated the influence of temperature on the in vitro growth of seven indigenous local isolates and the humidity requirements necessary to promote successful infection, in comparison with two commercial isolates (B. bassiana PPRI 5339 and M. anisopliae ICIPE 69). All the fungal isolates grew across a range of temperatures (8–34 °C) and optimally between 26 and 28 °C. Similarly, fungal infection of Thaumatotibia leucotreta Meyrick (Lepidoptera: Tortricidae) fifth instars occurred across a range of humidity levels (12%, 43%, 75%, 98%) regardless of fungal concentration, although external sporulation was restricted to treatments exposed to 98% relative humidity. It was concluded that neither temperature nor humidity, when considered alone, is likely to significantly influence the efficacy of any of the isolates in the field, given that they are active within temperature and humidity ranges experienced in South African citrus orchards.
Format: computer
Format: online resource
Format: application/pdf
Format: 1 online resource (9 pages)
Format: pdf
Publisher: Elsevier
Language: English
Relation: Journal of Invertebrate Pathology
Relation: Acheampong, M.A., Coombes, C.A., Moore, S.D. and Hill, M.P., 2020. Temperature tolerance and humidity requirements of select entomopathogenic fungal isolates for future use in citrus IPM programmes. Journal of invertebrate pathology, 174, p.107436
Relation: Journal of Invertebrate Pathology volume 174 p. 107436 2020 0022-2011
Rights: Publisher
Rights: Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)
Rights: Closed Access

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RU DST/NRF SARChI for Insects in Sustainable Agricultural Ecosystems

Coombes, Candice Anne (Dr)

Hill, Martin Patrick (Distinguished Professor)

SDG 15. Life On Land

RU Department of Zoology and Entomology

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