Effects of bund crops and insecticide treatments on arthropod diversity and herbivore regulation in tropical rice fields

Horgan, FG; Ramal, AF; Villegas, JM; Jamoralin, A; Bernal, CC; Perez, MO; Pasang, JM; Naredo, AI; Almazan, MLP

Effects of bund crops and insecticide treatments on arthropod diversity and herbivore regulation in tropical rice fields

Horgan, FG

Ramal, AF Villegas, JM Jamoralin, A Bernal, CC Perez, MO Pasang, JM Naredo, AI Almazan, MLP

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Publication Type:: Journal Article
Citation:: Journal of Applied Entomology, 2017, 141 (8), pp. 587 - 599
Issue Date:: 2017-09-01

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Field	Value	Language
dc.contributor.author	Horgan, FG https://orcid.org/0000-0003-3796-667X	en_US
dc.contributor.author	Ramal, AF	en_US
dc.contributor.author	Villegas, JM	en_US
dc.contributor.author	Jamoralin, A	en_US
dc.contributor.author	Bernal, CC	en_US
dc.contributor.author	Perez, MO	en_US
dc.contributor.author	Pasang, JM	en_US
dc.contributor.author	Naredo, AI	en_US
dc.contributor.author	Almazan, MLP	en_US
dc.date.issued	2017-09-01	en_US
dc.identifier.citation	Journal of Applied Entomology, 2017, 141 (8), pp. 587 - 599	en_US
dc.identifier.issn	0931-2048	en_US
dc.identifier.uri	http://hdl.handle.net/10453/115222
dc.description.abstract	© 2017 Blackwell Verlag GmbH Ecological engineering using vegetable or flower strips is promoted as a potential pest management strategy in irrigated rice. Farmers in the Philippines often plant rice levees (bunds) with vegetables, particularly string beans (Vigna unguiculata [L.] Walpers) to supplement income, but without considering the potential for pest management. This study examines the effects of planted bunds on rice herbivores and their natural enemies. We compared arthropods in (a) rice fields that had string beans planted on bunds, (b) fields without string beans and without any insecticide applications and (c) fields without string beans but with insecticide treatments (standard practice). Rice yield was similar across all treatments; however, the vegetation strips produced an extra 3.6 kg of fresh string bean pods per metre of bund. There were no apparent increases in major natural enemy groups in fields with string beans compared to fields with conventional bunds. Fields with insecticide treatments had higher damage from leaffolders (Lepidoptera: Pyralidae). The sprayed fields also had lower parasitism of planthopper eggs and fewer predatory dragonflies and damselflies (Odonata). Furthermore, the mortality of planthopper (Delphacidae: Hemiptera) and stemborer (Pyralidae) eggs by parasitoids and predators was density dependent only in the unsprayed fields (with and without string beans). Our results demonstrate that planting string beans on rice bunds improves the productivity of rice farms, but our ecological engineering system did not appreciably affect natural enemy or herbivore abundance; however, chemical insecticides adversely affected pest regulatory ecosystem functions leading to higher pest damage.	en_US
dc.relation.ispartof	Journal of Applied Entomology	en_US
dc.relation.isbasedon	10.1111/jen.12383	en_US
dc.subject.classification	Entomology	en_US
dc.title	Effects of bund crops and insecticide treatments on arthropod diversity and herbivore regulation in tropical rice fields	en_US
dc.type	Journal Article
utslib.citation.volume	8	en_US
utslib.citation.volume	141	en_US
utslib.for	0608 Zoology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access
pubs.issue	8	en_US
pubs.publication-status	Published	en_US
pubs.volume	141	en_US

Abstract:

© 2017 Blackwell Verlag GmbH Ecological engineering using vegetable or flower strips is promoted as a potential pest management strategy in irrigated rice. Farmers in the Philippines often plant rice levees (bunds) with vegetables, particularly string beans (Vigna unguiculata [L.] Walpers) to supplement income, but without considering the potential for pest management. This study examines the effects of planted bunds on rice herbivores and their natural enemies. We compared arthropods in (a) rice fields that had string beans planted on bunds, (b) fields without string beans and without any insecticide applications and (c) fields without string beans but with insecticide treatments (standard practice). Rice yield was similar across all treatments; however, the vegetation strips produced an extra 3.6 kg of fresh string bean pods per metre of bund. There were no apparent increases in major natural enemy groups in fields with string beans compared to fields with conventional bunds. Fields with insecticide treatments had higher damage from leaffolders (Lepidoptera: Pyralidae). The sprayed fields also had lower parasitism of planthopper eggs and fewer predatory dragonflies and damselflies (Odonata). Furthermore, the mortality of planthopper (Delphacidae: Hemiptera) and stemborer (Pyralidae) eggs by parasitoids and predators was density dependent only in the unsprayed fields (with and without string beans). Our results demonstrate that planting string beans on rice bunds improves the productivity of rice farms, but our ecological engineering system did not appreciably affect natural enemy or herbivore abundance; however, chemical insecticides adversely affected pest regulatory ecosystem functions leading to higher pest damage.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/115222