Entomopathogenic fungi as control agents of Thaumatotibia leucotreta in citrus orchards: field efficacy and persistence
- Coombes, Candice A, Hill, Martin P, Moore, Sean D, Dames, Joanna F
- Authors: Coombes, Candice A , Hill, Martin P , Moore, Sean D , Dames, Joanna F
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/417956 , vital:71497 , xlink:href="https://doi.org/10.1007/s10526-016-9756-x"
- Description: Entomopathogenic fungal isolates Beauveria bassiana (Balsamo) Vuillemin (Hypocreales: Cordycipitaceae) strain G Ar 17 B3 and Metarhizium anisopliae (Metchnikoff) Sorokin (Hypocreales: Clavicipitaceae) strain FCM Ar 23 B3 have been identified as effective control agents of the important citrus pest Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) wandering fifth instars under laboratory conditions. This study is the first report on the ability of these isolates to persist and reduce T. leucotreta infestation in commercial citrus orchards in South Africa. A reduction in pest infestation of between 28 and 82 % upon trial completion was reported. Both isolates were recovered from soil samples collected five months post-application with high host density and moderate to high soil moisture favouring recovery. Low soil moisture negatively influenced the persistence of both isolates and the control efficiency of B. bassiana. These results provide evidence and support for the future use of these isolates against T. leucotreta thus warranting further investigation.
- Full Text:
- Authors: Coombes, Candice A , Hill, Martin P , Moore, Sean D , Dames, Joanna F
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/417956 , vital:71497 , xlink:href="https://doi.org/10.1007/s10526-016-9756-x"
- Description: Entomopathogenic fungal isolates Beauveria bassiana (Balsamo) Vuillemin (Hypocreales: Cordycipitaceae) strain G Ar 17 B3 and Metarhizium anisopliae (Metchnikoff) Sorokin (Hypocreales: Clavicipitaceae) strain FCM Ar 23 B3 have been identified as effective control agents of the important citrus pest Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) wandering fifth instars under laboratory conditions. This study is the first report on the ability of these isolates to persist and reduce T. leucotreta infestation in commercial citrus orchards in South Africa. A reduction in pest infestation of between 28 and 82 % upon trial completion was reported. Both isolates were recovered from soil samples collected five months post-application with high host density and moderate to high soil moisture favouring recovery. Low soil moisture negatively influenced the persistence of both isolates and the control efficiency of B. bassiana. These results provide evidence and support for the future use of these isolates against T. leucotreta thus warranting further investigation.
- Full Text:
The role of entomopathogenic fungi in the control of citrus pests in South Africa: cause for optimism
- Coombes, Candice A, Chartier-Fizgerald, Veronique C, Wiblin, Danielle, Dames, Joanna F, Hill, Martin P, Moore, Sean D
- Authors: Coombes, Candice A , Chartier-Fizgerald, Veronique C , Wiblin, Danielle , Dames, Joanna F , Hill, Martin P , Moore, Sean D
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/453480 , vital:75257 , ISBN 978-1-83768-091-7 , https://iobc-wprs.org/product/the-role-of-entomopathogenic-fungi-in-the-control-of-citrus-pests-in-south-africa-cause-for-optimism/
- Description: Citrus is a highly productive crop in South Africa, but it is damaged by a number of pests that result in yield loss and have the potential to limit market access. Maximum residue limits (MRLs) imposed by importing countries have driven the need for alternative control technologies, including the use of entomopathogenic fungi (EPF). Bioprospecting in citrus orchards and seven years of bioassay trials identified Beauveria bassiana G Ar 17 B3 and Metarhizium anisopliae G 11 3 L6 and FCM Ar 23 B3 as the most virulent fungal isolates. Preliminary trials with these three fungi against the arboreal pests, California red scale, Aonidiella aurantii (Maskell), citrus mealybug, Planococcus citri (Risso) and citrus thrips, Scirtothrips aurantii Faure, have been promising. False codling moth (FCM), Thaumatotibia leucotreta (Meyrick) is the most important citrus pest in South Africa and while considerable research has been conducted on controlling the insect on the tree, the soil borne stages of this insect have largely been ignored. After laboratory bioassays, the three fungal isolates were taken to field trials. All three isolates persisted for at least six months after application to the soil. A large scale field trial, showed that although all three isolates reduced FCM infestation, isolate B. bassiana G Ar 17 B3 performed best, recording a consistent 80% reduction in FCM infestation throughout the trial period. The results of nearly 10 years of research on the potential of EPFs in the control of citrus pests in South Africa are certainly cause for optimism.
- Full Text:
- Authors: Coombes, Candice A , Chartier-Fizgerald, Veronique C , Wiblin, Danielle , Dames, Joanna F , Hill, Martin P , Moore, Sean D
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/453480 , vital:75257 , ISBN 978-1-83768-091-7 , https://iobc-wprs.org/product/the-role-of-entomopathogenic-fungi-in-the-control-of-citrus-pests-in-south-africa-cause-for-optimism/
- Description: Citrus is a highly productive crop in South Africa, but it is damaged by a number of pests that result in yield loss and have the potential to limit market access. Maximum residue limits (MRLs) imposed by importing countries have driven the need for alternative control technologies, including the use of entomopathogenic fungi (EPF). Bioprospecting in citrus orchards and seven years of bioassay trials identified Beauveria bassiana G Ar 17 B3 and Metarhizium anisopliae G 11 3 L6 and FCM Ar 23 B3 as the most virulent fungal isolates. Preliminary trials with these three fungi against the arboreal pests, California red scale, Aonidiella aurantii (Maskell), citrus mealybug, Planococcus citri (Risso) and citrus thrips, Scirtothrips aurantii Faure, have been promising. False codling moth (FCM), Thaumatotibia leucotreta (Meyrick) is the most important citrus pest in South Africa and while considerable research has been conducted on controlling the insect on the tree, the soil borne stages of this insect have largely been ignored. After laboratory bioassays, the three fungal isolates were taken to field trials. All three isolates persisted for at least six months after application to the soil. A large scale field trial, showed that although all three isolates reduced FCM infestation, isolate B. bassiana G Ar 17 B3 performed best, recording a consistent 80% reduction in FCM infestation throughout the trial period. The results of nearly 10 years of research on the potential of EPFs in the control of citrus pests in South Africa are certainly cause for optimism.
- Full Text:
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