The thermal physiology of Lysathia sp.(Coleoptera: Chrysomelidae), a biocontrol agent of parrot’s feather in South Africa, supports its success

Goddard, Matthew; Owen, Candice A; Martin, Grant D; Coetzee, Julie A

Title: The thermal physiology of Lysathia sp.(Coleoptera: Chrysomelidae), a biocontrol agent of parrot’s feather in South Africa, supports its success
Creator: Goddard, Matthew
Creator: Owen, Candice A
Creator: Martin, Grant D
Creator: Coetzee, Julie A
Subject: To be catalogued
Date Issued: 2022
Date: 2022
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/417806
Identifier: vital:71487
Identifier: xlink:href="https://doi.org/10.1080/09583157.2022.2054949"
Description: The establishment success of biocontrol agents originating from tropical regions is often limited by climate when introduced in temperate regions. However, the flea beetle, Lysathia sp. (Coleoptera: Chrysomelidae), a biocontrol agent of Myriophyllum aquaticum (Vell.) Verdc. (Haloragaceae) in South Africa, is an effective agent in regions where other biocontrol agents of tropical aquatic weeds have failed due to winter-induced mortality. The development (degree-day model) and thermal tolerance (critical thermal minimum/maximum [CTmin/max] and lower/upper lethal limits [LLT/ULT50]) of Lysathia sp. were investigated to explain this success. The model predicted that Lysathia sp. could complete 6 to 12 generations per year in the colder regions of the country. The lower threshold for development (t0) was 13.0 °C and thermal constant (K) was 222.4 days, which is considerably lower than the K values of other biocontrol agents of aquatic weeds in South Africa. This suggests that above the temperature threshold, Lysathia sp. can develop faster than those other species and complete multiple life cycles in the cooler winter months, allowing for rapid population growth and thus improving M. aquaticum control. Furthermore, the CTmin of Lysathia sp. was 2.3 ± 0.2 °C and the CTmax was 49.0 ± 0.5 °C. The LLT50 was calculated as ∼ −7.0 °C and the ULT50 as ∼ 43.0 °C. These wide tolerance ranges and survival below freezing show why Lysathia sp. has established at cool sites and suggest that it may be a suitable agent for other cold countries invaded by M. aquaticum.
Format: computer
Format: online resource
Format: application/pdf
Format: 1 online resource (10 pages)
Format: pdf
Publisher: Taylor and Francis Online
Language: English
Relation: Biocontrol Science and Technology
Relation: Goddard, M., Owen, C.A., Martin, G. and Coetzee, J.A., 2022. The thermal physiology of Lysathia sp.(Coleoptera: Chrysomelidae), a biocontrol agent of parrot’s feather in South Africa, supports its success. Biocontrol Science and Technology, 32(7), pp.837-846
Relation: Biocontrol Science and Technology volume 32 number 7 p. 837 2022 1360-0478
Rights: Publisher
Rights: Use of this resource is governed by the terms and conditions of the Taylor and Francis Online Terms and Conditions Statement (https://www.tandfonline.com/terms-and-conditions)
Rights: Closed Access

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Owen, Candice Ann (Dr)

Martin, Grant D (Dr)

Coetzee, Julie A (Prof)

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RU Department of Botany

RU Department of Zoology and Entomology

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