Forecasting Spring Flight of Ips subelongatus (Coleoptera: Curculionidae: Scolytinae) in Japanese larch Larix kaempferi (Pinales: Pinaceae) Forests in the Republic of Korea

Ips subelongatus is a species of bark beetle experiencing population outbreaks in Korea. In this study, a predictive model and empirical prediction were used to forecast the spring flight of these beetles in Japanese larch forests.The number of beetles caught in pheromone traps was investigated in l...

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Veröffentlicht in:Environmental entomology 2019-12, Vol.48 (6), p.1481-1488
Hauptverfasser: Lee, Cha Young, Nam, Youngwoo, Park, Chanwoo, Bae, Yeon Jae, Choi, Won Il
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container_end_page 1488
container_issue 6
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container_title Environmental entomology
container_volume 48
creator Lee, Cha Young
Nam, Youngwoo
Park, Chanwoo
Bae, Yeon Jae
Choi, Won Il
description Ips subelongatus is a species of bark beetle experiencing population outbreaks in Korea. In this study, a predictive model and empirical prediction were used to forecast the spring flight of these beetles in Japanese larch forests.The number of beetles caught in pheromone traps was investigated in larch forests thinned in 2009, 2010, 2012, or 2013. Data from the sites thinned in 2009, 2010, or 2012 were used in the predictive model based on a degree-day model that was validated using data from the site thinned in 2013.The lower threshold temperature for flight (LTF) and a thermal sum for the spring flight of I. subelongatus were estimated.The empirical prediction that beetles initiate their flight when daily maximum temperatures reach 16 or 20°C was tested using daily maximum temperature and the beetles caught.The LTF was estimated as 5.97°C, with 42.95 degree-days required for initiation of spring flight.The median flight dates were estimated with a discrepancy from 1 to 3 d by the predictive model. Using the empirical prediction, differences between the day when daily maximum temperature reached 16 or 20°C and flight peak days ranged from 4 to 45 d. These results demonstrate that the predictive model is more suitable than the empirical prediction for predicting the spring flight of I. subelongatus. Overwintering I. subelongatus adults seem to need to gain a determined thermal sum before initiating spring flight rather than merely waiting for the daily maximum temperature to exceed a critical temperature.
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In this study, a predictive model and empirical prediction were used to forecast the spring flight of these beetles in Japanese larch forests.The number of beetles caught in pheromone traps was investigated in larch forests thinned in 2009, 2010, 2012, or 2013. Data from the sites thinned in 2009, 2010, or 2012 were used in the predictive model based on a degree-day model that was validated using data from the site thinned in 2013.The lower threshold temperature for flight (LTF) and a thermal sum for the spring flight of I. subelongatus were estimated.The empirical prediction that beetles initiate their flight when daily maximum temperatures reach 16 or 20°C was tested using daily maximum temperature and the beetles caught.The LTF was estimated as 5.97°C, with 42.95 degree-days required for initiation of spring flight.The median flight dates were estimated with a discrepancy from 1 to 3 d by the predictive model. Using the empirical prediction, differences between the day when daily maximum temperature reached 16 or 20°C and flight peak days ranged from 4 to 45 d. These results demonstrate that the predictive model is more suitable than the empirical prediction for predicting the spring flight of I. subelongatus. Overwintering I. subelongatus adults seem to need to gain a determined thermal sum before initiating spring flight rather than merely waiting for the daily maximum temperature to exceed a critical temperature.</description><identifier>ISSN: 0046-225X</identifier><identifier>EISSN: 1938-2936</identifier><identifier>DOI: 10.1093/ee/nvz105</identifier><identifier>PMID: 31789365</identifier><language>eng</language><publisher>US: Entomological Society of America</publisher><subject>Animals ; Coleoptera ; degree-day ; forecasting model ; Forests ; Ips subelongatus ; Japan ; Larix ; Pinaceae ; Pinales ; POPULATION ECOLOGY ; Republic of Korea ; spring flight ; temperature dependent ; Weevils</subject><ispartof>Environmental entomology, 2019-12, Vol.48 (6), p.1481-1488</ispartof><rights>The Author(s) 2019. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. 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Using the empirical prediction, differences between the day when daily maximum temperature reached 16 or 20°C and flight peak days ranged from 4 to 45 d. These results demonstrate that the predictive model is more suitable than the empirical prediction for predicting the spring flight of I. subelongatus. 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Using the empirical prediction, differences between the day when daily maximum temperature reached 16 or 20°C and flight peak days ranged from 4 to 45 d. These results demonstrate that the predictive model is more suitable than the empirical prediction for predicting the spring flight of I. subelongatus. Overwintering I. subelongatus adults seem to need to gain a determined thermal sum before initiating spring flight rather than merely waiting for the daily maximum temperature to exceed a critical temperature.</abstract><cop>US</cop><pub>Entomological Society of America</pub><pmid>31789365</pmid><doi>10.1093/ee/nvz105</doi><tpages>8</tpages></addata></record>
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source MEDLINE; Oxford University Press Journals All Titles (1996-Current); Alma/SFX Local Collection
subjects Animals
Coleoptera
degree-day
forecasting model
Forests
Ips subelongatus
Japan
Larix
Pinaceae
Pinales
POPULATION ECOLOGY
Republic of Korea
spring flight
temperature dependent
Weevils
title Forecasting Spring Flight of Ips subelongatus (Coleoptera: Curculionidae: Scolytinae) in Japanese larch Larix kaempferi (Pinales: Pinaceae) Forests in the Republic of Korea
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