Field experiments was conducted to determine the relationship between Tibraca limbativentris infestation and rice yield loss. Experimental design involved randomized complete blocks with at least four replications

ALVES, T. M. M.

BARRIGOSSI, J. A. F.

CAIXETA, D. F.

English

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4131: Developing economic thresholds for stink bugs in rice — problems and prospectsFriday, September 30, 201603:30 PM - 03:45 PMConvention Center - Room W230 CIntroduction: The relationship between injury and yield loss is central to the economic injury level (EIL) concept.However, establishing quantitative relationships between populations, injury and yield is difficult for piercing/suckinginsects. Stink bug injury in rice is difficult to quantify because feeding occurs over an extended period of time and theinjury is initially indistinct. Yield is lost through the combined effects of injury and time.Methods: We conducted field experiments to determine the relationship between Tibraca limbativentris infestation andrice yield loss. Experimental design involved randomized complete blocks with at least four replications. Treatmentsconsisted of stink bug infestations at different population densities. Yield was regressed against stink bugs/m andslope of the linear regression was used as the yield loss/insect density variable in EIL calculations.Results/Conclusion: Although T. limbativentris can produce large numbers of "dead hearts" and “white panicles”,under normal conditions (reasonably fertile soil, limited use of insecticides) yield loss can have limited economicsignificance. However, stink bugs and “dead hearts” are highly visible and create farmer perceptions of considerabledamage. Alternative methods for assessing the need for therapeutic action are required. One approach may be to settargets for the number of undamaged panicles per unit area to optimize yield, rather than to have responses triggeredby the number that are damaged. The insect/day approach is other useful tool that could be used to measure theintensity of stink bug attack on rice plants, because it combines the number of insects and the duration of theirfeeding.doi: 10.1603/ICE.2016.939832AuthorsJosé Alexandre Freitas BarrigossiEmbrapa Arroz e FeijãoDaniel F. CaixetaUni-EvangélicaTavvs M M. AlvesUniversity of MinnesotaView Related EventsSymposium : 628 Symposium: Global Challenges in Rice Pest ManagementProgram : SymposiumDay:  Friday, September 30, 20162016 International Congress of Entomology https://esa.confex.com/esa/ice2016/meetingapp.cgi/Paper/939831 de 1 22/02/2017 10:46

Developing economic thresholds for stink bugs in rice - problems and prospects.

http://www.alice.cnptia.embrapa.br/bitstream/doc/1065183/1/CNPAF2016jafb.pdf

Developing economic thresholds for stink bugs in rice - problems and prospects.

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