Abstract
ABSTRACT Tibraca limbativentris to is an important rice pest and occurs in all rice-growing regions of Latin America. The control this insect is accomplished with synthetic chemical insecticides, however, new approaches are needed to reduce risks to the environment, to the natural enemies and also to avoid the onset of insecticides resistance. This study was designed to assess the toxicity of essential oils (EOs) from leaves of Piper aduncum, P. gaudichaudianum, P. malacophyllum, P. marginatum and P. tuberculatum (Piperaceae) on rice stalk stink bug eggs, T. limbativentris. Essential oils were extracted with steam distillation and dilutions were made for bioassays at concentrations of 0.25; 0.5; 1.0; 2.0 and 4.0%. Essential oils from all species of Piperaceae displayed ovicidal activity. The LC50 values indicated that both younger and older eggs were susceptible to these oils. Ovicidal activity is related to the potential toxicity of several compounds, especially dilapiolle, myristicin, cubebene, α-guaiene, longifolene, prezizane, spathulenol, sabinene and δ-2-carene. Thus, EOs tested showed promising results for use as biorational botanical insecticides.
Highlights
The rice stalk stink bug, Tibraca limbativentris Stål, occurs in all rice-growing regions of Latin America, where it is an important pest causing significant losses during the pre-flowering and grain filling stages (Krinski; Foerster, 2016)
To obtain the essential oils (EOs) we used leaves of Piper marginatum L. (7°07’43.56”S 55°23’22.09”W - 231 m) and Piper malacophyllum Prels., collected at Fazenda Florentino, Novo Progresso, (7°06’56.31”S 55°24’22.19”W - 210 m), Pará State, Brazil; Piper aduncum L. and Piper tuberculatum Jacq., collected at Tangará da Serra, Mato Grosso State, Brazil; and Piper gaudichaudianum Kuntze collected near Tingui Park, Curitiba, (25°23’30”S 49°18’22”W - 908 m) Paraná State
We evaluated the effect of EOs of leaves from five Piperaceae species on rice stem insect eggs
Summary
The rice stalk stink bug, Tibraca limbativentris Stål, occurs in all rice-growing regions of Latin America, where it is an important pest causing significant losses during the pre-flowering and grain filling stages (Krinski; Foerster, 2016) The occurrence of this pest has increased due to greater crop acreage, and favorable climatic and agronomic practices (Martins; Grützmacher; Cunha, 2004; Rampelotti et al, 2007). Biopesticides with a different mode of action from that of conventional neurotoxic insecticides can reduce the risk of resistance (Olson, 2015). They may be safer and environmentally more acceptable (Sahayaraj, 2014). Strategies of insect management should include alternatives to conventional insecticides
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
