In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species

One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly...
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Autor*in:	Benno A. Augustinus [verfasserIn] Suzanne T. E. Lommen [verfasserIn] Silvia Fogliatto [verfasserIn] Francesco Vidotto [verfasserIn] Tessa Smith [verfasserIn] David Horvath [verfasserIn] Maira Bonini [verfasserIn] Rodolfo F. Gentili [verfasserIn] Sandra Citterio [verfasserIn] Heinz Müller-Schärer [verfasserIn] Urs Schaffner [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Übergeordnetes Werk:	In: NeoBiota - Pensoft Publishers, 2012, 55(2020), Seite 117-146
Übergeordnetes Werk:	volume:55 ; year:2020 ; pages:117-146

Links:	Link aufrufen Link aufrufen Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3897/neobiota.55.46874

Katalog-ID:	DOAJ02156390X

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allfields	10.3897/neobiota.55.46874 doi (DE-627)DOAJ02156390X (DE-599)DOAJ11b297f63f894561a4d6f9f72d7532c4 DE-627 ger DE-627 rakwb eng QH301-705.5 Benno A. Augustinus verfasserin aut In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly allergenic pollen and as a weed to agricultural crops resulting from high seed densities. Here we assessed whether the pollen and seed output of the annual A. artemisiifolia (at the end of the season) is related to in-season abundance of, or damage by, the accidentally introduced biological control agent Ophraella communa. We monitored the growth and leaf damage of individually labelled A. artemisiifolia plants at four locations in Northern Italy and recorded abundance of different O. communa life stages at regular intervals. We found that the in-season level of leaf damage by O. communa consistently helped to explain seed production in combination with plant volume and site throughout the season. Feeding damage, plant volume and site also explained pollen production by A. artemisiifolia six weeks before male flower formation. At three out of four sites, plants with more than 10% leaf damage in mid-June or early July had a very low likelihood of seed formation. Leaf damage proved to be a better explanatory variable than O. communa abundance. Our results suggest that the monitoring of the in-season leaf damage can help to project the local impact of O. communa on A. artemisiifolia at the end of the season and thus inform management regarding the needs for additional measures to control this prominent invader. Biology (General) Suzanne T. E. Lommen verfasserin aut Silvia Fogliatto verfasserin aut Francesco Vidotto verfasserin aut Tessa Smith verfasserin aut David Horvath verfasserin aut Maira Bonini verfasserin aut Rodolfo F. Gentili verfasserin aut Sandra Citterio verfasserin aut Heinz Müller-Schärer verfasserin aut Urs Schaffner verfasserin aut In NeoBiota Pensoft Publishers, 2012 55(2020), Seite 117-146 (DE-627)668711868 (DE-600)2628537-X 13142488 nnns volume:55 year:2020 pages:117-146 https://doi.org/10.3897/neobiota.55.46874 kostenfrei https://doaj.org/article/11b297f63f894561a4d6f9f72d7532c4 kostenfrei https://neobiota.pensoft.net/article/46874/download/pdf/ kostenfrei https://neobiota.pensoft.net/article/46874/download/xml/ kostenfrei https://neobiota.pensoft.net/article/46874/ kostenfrei https://doaj.org/toc/1314-2488 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 55 2020 117-146
spelling	10.3897/neobiota.55.46874 doi (DE-627)DOAJ02156390X (DE-599)DOAJ11b297f63f894561a4d6f9f72d7532c4 DE-627 ger DE-627 rakwb eng QH301-705.5 Benno A. Augustinus verfasserin aut In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly allergenic pollen and as a weed to agricultural crops resulting from high seed densities. Here we assessed whether the pollen and seed output of the annual A. artemisiifolia (at the end of the season) is related to in-season abundance of, or damage by, the accidentally introduced biological control agent Ophraella communa. We monitored the growth and leaf damage of individually labelled A. artemisiifolia plants at four locations in Northern Italy and recorded abundance of different O. communa life stages at regular intervals. We found that the in-season level of leaf damage by O. communa consistently helped to explain seed production in combination with plant volume and site throughout the season. Feeding damage, plant volume and site also explained pollen production by A. artemisiifolia six weeks before male flower formation. At three out of four sites, plants with more than 10% leaf damage in mid-June or early July had a very low likelihood of seed formation. Leaf damage proved to be a better explanatory variable than O. communa abundance. Our results suggest that the monitoring of the in-season leaf damage can help to project the local impact of O. communa on A. artemisiifolia at the end of the season and thus inform management regarding the needs for additional measures to control this prominent invader. Biology (General) Suzanne T. E. Lommen verfasserin aut Silvia Fogliatto verfasserin aut Francesco Vidotto verfasserin aut Tessa Smith verfasserin aut David Horvath verfasserin aut Maira Bonini verfasserin aut Rodolfo F. Gentili verfasserin aut Sandra Citterio verfasserin aut Heinz Müller-Schärer verfasserin aut Urs Schaffner verfasserin aut In NeoBiota Pensoft Publishers, 2012 55(2020), Seite 117-146 (DE-627)668711868 (DE-600)2628537-X 13142488 nnns volume:55 year:2020 pages:117-146 https://doi.org/10.3897/neobiota.55.46874 kostenfrei https://doaj.org/article/11b297f63f894561a4d6f9f72d7532c4 kostenfrei https://neobiota.pensoft.net/article/46874/download/pdf/ kostenfrei https://neobiota.pensoft.net/article/46874/download/xml/ kostenfrei https://neobiota.pensoft.net/article/46874/ kostenfrei https://doaj.org/toc/1314-2488 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 55 2020 117-146
allfields_unstemmed	10.3897/neobiota.55.46874 doi (DE-627)DOAJ02156390X (DE-599)DOAJ11b297f63f894561a4d6f9f72d7532c4 DE-627 ger DE-627 rakwb eng QH301-705.5 Benno A. Augustinus verfasserin aut In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly allergenic pollen and as a weed to agricultural crops resulting from high seed densities. Here we assessed whether the pollen and seed output of the annual A. artemisiifolia (at the end of the season) is related to in-season abundance of, or damage by, the accidentally introduced biological control agent Ophraella communa. We monitored the growth and leaf damage of individually labelled A. artemisiifolia plants at four locations in Northern Italy and recorded abundance of different O. communa life stages at regular intervals. We found that the in-season level of leaf damage by O. communa consistently helped to explain seed production in combination with plant volume and site throughout the season. Feeding damage, plant volume and site also explained pollen production by A. artemisiifolia six weeks before male flower formation. At three out of four sites, plants with more than 10% leaf damage in mid-June or early July had a very low likelihood of seed formation. Leaf damage proved to be a better explanatory variable than O. communa abundance. Our results suggest that the monitoring of the in-season leaf damage can help to project the local impact of O. communa on A. artemisiifolia at the end of the season and thus inform management regarding the needs for additional measures to control this prominent invader. Biology (General) Suzanne T. E. Lommen verfasserin aut Silvia Fogliatto verfasserin aut Francesco Vidotto verfasserin aut Tessa Smith verfasserin aut David Horvath verfasserin aut Maira Bonini verfasserin aut Rodolfo F. Gentili verfasserin aut Sandra Citterio verfasserin aut Heinz Müller-Schärer verfasserin aut Urs Schaffner verfasserin aut In NeoBiota Pensoft Publishers, 2012 55(2020), Seite 117-146 (DE-627)668711868 (DE-600)2628537-X 13142488 nnns volume:55 year:2020 pages:117-146 https://doi.org/10.3897/neobiota.55.46874 kostenfrei https://doaj.org/article/11b297f63f894561a4d6f9f72d7532c4 kostenfrei https://neobiota.pensoft.net/article/46874/download/pdf/ kostenfrei https://neobiota.pensoft.net/article/46874/download/xml/ kostenfrei https://neobiota.pensoft.net/article/46874/ kostenfrei https://doaj.org/toc/1314-2488 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 55 2020 117-146
allfieldsGer	10.3897/neobiota.55.46874 doi (DE-627)DOAJ02156390X (DE-599)DOAJ11b297f63f894561a4d6f9f72d7532c4 DE-627 ger DE-627 rakwb eng QH301-705.5 Benno A. Augustinus verfasserin aut In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly allergenic pollen and as a weed to agricultural crops resulting from high seed densities. Here we assessed whether the pollen and seed output of the annual A. artemisiifolia (at the end of the season) is related to in-season abundance of, or damage by, the accidentally introduced biological control agent Ophraella communa. We monitored the growth and leaf damage of individually labelled A. artemisiifolia plants at four locations in Northern Italy and recorded abundance of different O. communa life stages at regular intervals. We found that the in-season level of leaf damage by O. communa consistently helped to explain seed production in combination with plant volume and site throughout the season. Feeding damage, plant volume and site also explained pollen production by A. artemisiifolia six weeks before male flower formation. At three out of four sites, plants with more than 10% leaf damage in mid-June or early July had a very low likelihood of seed formation. Leaf damage proved to be a better explanatory variable than O. communa abundance. Our results suggest that the monitoring of the in-season leaf damage can help to project the local impact of O. communa on A. artemisiifolia at the end of the season and thus inform management regarding the needs for additional measures to control this prominent invader. Biology (General) Suzanne T. E. Lommen verfasserin aut Silvia Fogliatto verfasserin aut Francesco Vidotto verfasserin aut Tessa Smith verfasserin aut David Horvath verfasserin aut Maira Bonini verfasserin aut Rodolfo F. Gentili verfasserin aut Sandra Citterio verfasserin aut Heinz Müller-Schärer verfasserin aut Urs Schaffner verfasserin aut In NeoBiota Pensoft Publishers, 2012 55(2020), Seite 117-146 (DE-627)668711868 (DE-600)2628537-X 13142488 nnns volume:55 year:2020 pages:117-146 https://doi.org/10.3897/neobiota.55.46874 kostenfrei https://doaj.org/article/11b297f63f894561a4d6f9f72d7532c4 kostenfrei https://neobiota.pensoft.net/article/46874/download/pdf/ kostenfrei https://neobiota.pensoft.net/article/46874/download/xml/ kostenfrei https://neobiota.pensoft.net/article/46874/ kostenfrei https://doaj.org/toc/1314-2488 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 55 2020 117-146
allfieldsSound	10.3897/neobiota.55.46874 doi (DE-627)DOAJ02156390X (DE-599)DOAJ11b297f63f894561a4d6f9f72d7532c4 DE-627 ger DE-627 rakwb eng QH301-705.5 Benno A. Augustinus verfasserin aut In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly allergenic pollen and as a weed to agricultural crops resulting from high seed densities. Here we assessed whether the pollen and seed output of the annual A. artemisiifolia (at the end of the season) is related to in-season abundance of, or damage by, the accidentally introduced biological control agent Ophraella communa. We monitored the growth and leaf damage of individually labelled A. artemisiifolia plants at four locations in Northern Italy and recorded abundance of different O. communa life stages at regular intervals. We found that the in-season level of leaf damage by O. communa consistently helped to explain seed production in combination with plant volume and site throughout the season. Feeding damage, plant volume and site also explained pollen production by A. artemisiifolia six weeks before male flower formation. At three out of four sites, plants with more than 10% leaf damage in mid-June or early July had a very low likelihood of seed formation. Leaf damage proved to be a better explanatory variable than O. communa abundance. Our results suggest that the monitoring of the in-season leaf damage can help to project the local impact of O. communa on A. artemisiifolia at the end of the season and thus inform management regarding the needs for additional measures to control this prominent invader. Biology (General) Suzanne T. E. Lommen verfasserin aut Silvia Fogliatto verfasserin aut Francesco Vidotto verfasserin aut Tessa Smith verfasserin aut David Horvath verfasserin aut Maira Bonini verfasserin aut Rodolfo F. Gentili verfasserin aut Sandra Citterio verfasserin aut Heinz Müller-Schärer verfasserin aut Urs Schaffner verfasserin aut In NeoBiota Pensoft Publishers, 2012 55(2020), Seite 117-146 (DE-627)668711868 (DE-600)2628537-X 13142488 nnns volume:55 year:2020 pages:117-146 https://doi.org/10.3897/neobiota.55.46874 kostenfrei https://doaj.org/article/11b297f63f894561a4d6f9f72d7532c4 kostenfrei https://neobiota.pensoft.net/article/46874/download/pdf/ kostenfrei https://neobiota.pensoft.net/article/46874/download/xml/ kostenfrei https://neobiota.pensoft.net/article/46874/ kostenfrei https://doaj.org/toc/1314-2488 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_267 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 55 2020 117-146
language	English
source	In NeoBiota 55(2020), Seite 117-146 volume:55 year:2020 pages:117-146
sourceStr	In NeoBiota 55(2020), Seite 117-146 volume:55 year:2020 pages:117-146
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Biology (General)
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container_title	NeoBiota
authorswithroles_txt_mv	Benno A. Augustinus @@aut@@ Suzanne T. E. Lommen @@aut@@ Silvia Fogliatto @@aut@@ Francesco Vidotto @@aut@@ Tessa Smith @@aut@@ David Horvath @@aut@@ Maira Bonini @@aut@@ Rodolfo F. Gentili @@aut@@ Sandra Citterio @@aut@@ Heinz Müller-Schärer @@aut@@ Urs Schaffner @@aut@@
publishDateDaySort_date	2020-01-01T00:00:00Z
hierarchy_top_id	668711868
id	DOAJ02156390X
language_de	englisch
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callnumber-first	Q - Science
author	Benno A. Augustinus
spellingShingle	Benno A. Augustinus misc QH301-705.5 misc Biology (General) In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species
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topic_title	QH301-705.5 In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species
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title	In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species
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title_full	In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species
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author_browse	Benno A. Augustinus Suzanne T. E. Lommen Silvia Fogliatto Francesco Vidotto Tessa Smith David Horvath Maira Bonini Rodolfo F. Gentili Sandra Citterio Heinz Müller-Schärer Urs Schaffner
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title_sort	in-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species
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title_auth	In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species
abstract	One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly allergenic pollen and as a weed to agricultural crops resulting from high seed densities. Here we assessed whether the pollen and seed output of the annual A. artemisiifolia (at the end of the season) is related to in-season abundance of, or damage by, the accidentally introduced biological control agent Ophraella communa. We monitored the growth and leaf damage of individually labelled A. artemisiifolia plants at four locations in Northern Italy and recorded abundance of different O. communa life stages at regular intervals. We found that the in-season level of leaf damage by O. communa consistently helped to explain seed production in combination with plant volume and site throughout the season. Feeding damage, plant volume and site also explained pollen production by A. artemisiifolia six weeks before male flower formation. At three out of four sites, plants with more than 10% leaf damage in mid-June or early July had a very low likelihood of seed formation. Leaf damage proved to be a better explanatory variable than O. communa abundance. Our results suggest that the monitoring of the in-season leaf damage can help to project the local impact of O. communa on A. artemisiifolia at the end of the season and thus inform management regarding the needs for additional measures to control this prominent invader.
abstractGer	One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly allergenic pollen and as a weed to agricultural crops resulting from high seed densities. Here we assessed whether the pollen and seed output of the annual A. artemisiifolia (at the end of the season) is related to in-season abundance of, or damage by, the accidentally introduced biological control agent Ophraella communa. We monitored the growth and leaf damage of individually labelled A. artemisiifolia plants at four locations in Northern Italy and recorded abundance of different O. communa life stages at regular intervals. We found that the in-season level of leaf damage by O. communa consistently helped to explain seed production in combination with plant volume and site throughout the season. Feeding damage, plant volume and site also explained pollen production by A. artemisiifolia six weeks before male flower formation. At three out of four sites, plants with more than 10% leaf damage in mid-June or early July had a very low likelihood of seed formation. Leaf damage proved to be a better explanatory variable than O. communa abundance. Our results suggest that the monitoring of the in-season leaf damage can help to project the local impact of O. communa on A. artemisiifolia at the end of the season and thus inform management regarding the needs for additional measures to control this prominent invader.
abstract_unstemmed	One of the biggest challenges in classical biological control of invasive weeds is predicting the likelihood of success. Ambrosia artemisiifolia, a North American plant species that has become invasive in Europe, causes economic losses due to health problems resulting from its huge amount of highly allergenic pollen and as a weed to agricultural crops resulting from high seed densities. Here we assessed whether the pollen and seed output of the annual A. artemisiifolia (at the end of the season) is related to in-season abundance of, or damage by, the accidentally introduced biological control agent Ophraella communa. We monitored the growth and leaf damage of individually labelled A. artemisiifolia plants at four locations in Northern Italy and recorded abundance of different O. communa life stages at regular intervals. We found that the in-season level of leaf damage by O. communa consistently helped to explain seed production in combination with plant volume and site throughout the season. Feeding damage, plant volume and site also explained pollen production by A. artemisiifolia six weeks before male flower formation. At three out of four sites, plants with more than 10% leaf damage in mid-June or early July had a very low likelihood of seed formation. Leaf damage proved to be a better explanatory variable than O. communa abundance. Our results suggest that the monitoring of the in-season leaf damage can help to project the local impact of O. communa on A. artemisiifolia at the end of the season and thus inform management regarding the needs for additional measures to control this prominent invader.
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title_short	In-season leaf damage by a biocontrol agent explains reproductive output of an invasive plant species
url	https://doi.org/10.3897/neobiota.55.46874 https://doaj.org/article/11b297f63f894561a4d6f9f72d7532c4 https://neobiota.pensoft.net/article/46874/download/pdf/ https://neobiota.pensoft.net/article/46874/download/xml/ https://neobiota.pensoft.net/article/46874/ https://doaj.org/toc/1314-2488
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author2	Suzanne T. E. Lommen Silvia Fogliatto Francesco Vidotto Tessa Smith David Horvath Maira Bonini Rodolfo F. Gentili Sandra Citterio Heinz Müller-Schärer Urs Schaffner
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