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Thermal sum requirements for development and flight initiation of new-generation spruce bark beetles based on seasonal change in cuticular colour of trapped beetles

Fritscher, Danja and Schroeder, Martin (2022). Thermal sum requirements for development and flight initiation of new-generation spruce bark beetles based on seasonal change in cuticular colour of trapped beetles. Agricultural and Forest Entomology. 24 :3 , 405-421
[Research article]

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Abstract

The spruce bark beetle Ips typographus is the most important pest on Norway spruce in Europe. To improve predictions of bark beetle phenology in a warmer climate, correct thermal sums representing the development time of the new generation are needed. A standardized method for classifying adults into five different colours was used for describing the seasonal change in colour of beetles in breeding substrate and in weekly trap catches from regions located in southern, central and northern Sweden in 2015-2020. Repeated sampling of I. typographus from breeding substrate demonstrated that the adults get gradually darker, from light brown when newly moulted to dark brown or black in the following summer. In spring, four to five colours co-occurred among trapped beetles. Over time, the proportions of darker individuals increased until the two lightest colours were absent except for 2 cases out of 21 trapping locations/years. Thereafter, the individuals of the two lightest colours started to occur again, indicating that they belonged to the new generation. The average thermal sum from start of flight of parental generation in spring until onset of new-generation flight in summer was higher for southern Sweden [lower developmental threshold (LDT) 5 degrees C = 744 degree-days (dd); LDT 8.3 degrees C = 467 dd] than for northern Sweden (LDT 5 degrees C = 668 dd; LDT 8.3 degrees C = 418 dd). New-generation flight occurred in every year and region, but generally constituted only a small proportion of total seasonal flight activity.

Authors/Creators:Fritscher, Danja and Schroeder, Martin
Title:Thermal sum requirements for development and flight initiation of new-generation spruce bark beetles based on seasonal change in cuticular colour of trapped beetles
Series Name/Journal:Agricultural and Forest Entomology
Year of publishing :2022
Volume:24
Number:3
Page range:405-421
Number of Pages:17
Publisher:WILEY
ISSN:1461-9555
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:brood development, cuticle colour change, degree days, flight activity, Ips typographus, pheromone traps, population dynamics, spruce bark beetle, temperature models, voltinism
URN:NBN:urn:nbn:se:slu:epsilon-p-117054
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-117054
Additional ID:
Type of IDID
DOI10.1111/afe.12503
Web of Science (WoS)000787268000001
Scopus2-s2.0-85128743398
ID Code:28430
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:12 Jul 2022 08:25
Metadata Last Modified:12 Jul 2022 08:31

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