Compatibility of insecticides with rice resistance to planthoppers as influenced by the timing and frequency of applications

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cg.contributor.affiliationEcoLaVerna Integral Restoration Ecologyen
cg.contributor.affiliationUniversity of Edinburghen
cg.contributor.affiliationUniversidad Católica del Mauleen
cg.contributor.affiliationInstitut de Génétique, Environnement et Protection des Plantesen
cg.contributor.affiliationInstitut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnementen
cg.contributor.affiliationUniversité de Rennesen
cg.contributor.affiliationInternational Rice Research Instituteen
cg.identifier.doihttps://doi.org/10.3390/insects13020106en
cg.issn2075-4450en
cg.issue2en
cg.journalInsectsen
cg.volume13en
dc.contributor.authorHorgan, Finbarr G.en
dc.contributor.authorPeñalver-Cruz, Ainaraen
dc.date.accessioned2024-12-19T12:53:29Zen
dc.date.available2024-12-19T12:53:29Zen
dc.identifier.urihttps://hdl.handle.net/10568/164122
dc.titleCompatibility of insecticides with rice resistance to planthoppers as influenced by the timing and frequency of applicationsen
dcterms.abstractThe brown planthopper, Nilaparvata lugens (Stål)(BPH) is a pest of rice in Asia. We examined the effects of seven insecticides combined with host resistance against BPH. In a screenhouse environment, we treated BPH-infested and non-infested resistant (IR62) and susceptible (IR64) rice with buprofezin, carbofuran, cartap hydrochloride, cypermethrin, deltamethrin, fipronil, or thiamethoxam + chlorantraniliprole. In one experiment, plants received one, two or three applications. In a second experiment, plants received one early or late insecticide application. Carbofuran and fipronil reduced planthopper biomass densities but resistance did not contribute to these effects (i.e., resistance was redundant). Single applications of cartap hydrochloride (at 20 or 50 days after sowing (DAS)), cypermethrin (20 DAS), or buprofezin (50 DAS) reduced BPH biomass densities on IR62 (i.e., synergies); other insecticides and application times, and multiple applications of all insecticides did not reduce BPH biomass densities on IR62 more than on IR64 (i.e., either resistance or insecticides were redundant). Deltamethrin (three applications) was antagonistic to resistance, but host resistance tended to buffer against the negative effects of single deltamethrin applications. Yields of infested IR62 were not statistically improved by insecticide applications. Late applications reduced yields of non-infested rice. We discuss how prophylactic insecticide applications could destabilize BPH populations and reduce the productivity and profitability of resistant rice.en
dcterms.accessRightsOpen Access
dcterms.available2022-01-18
dcterms.bibliographicCitationHorgan, Finbarr G.; Peñalver-Cruz, Ainara. 2022. Compatibility of insecticides with rice resistance to planthoppers as influenced by the timing and frequency of applications. Insects, Volume 13 no. 2 p. 106en
dcterms.issued2022-01-18
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherMDPIen
dcterms.subjectinsect scienceen
dcterms.subjectnilaparvata lugensen
dcterms.subjectpestsen
dcterms.typeJournal Article

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