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ACARICIDAL ACTIVITY AND REPELLENCY OF BLECHNUM CORDATUM (BLECHNACEAE) AGAINST TETRANYCHUS URTICAE (ACARI: TETRANYCHIDAE)

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dc.creatorCARLOS LEONARDO ARMANDO CÉSPEDES ACUÑA
dc.creatorJULIO ENRIQUE ILDEFONSO ALARCÓN ENOS
dc.date2019
dc.date.accessioned2025-01-10T15:12:23Z
dc.date.available2025-01-10T15:12:23Z
dc.date.issued2019
dc.description.abstractTETRANYCHUS URTICAE IS A HIGHLY POLYPHAGOUS MITE SPECIES, WITH 1,140 HOST PLANT SPECIES REPORTED WORLDWIDE. IN THIS STUDY, BOTH BLECHNUM CORDATUM TOXICITY AND REPELLENT ACTIVITY AGAINST T. URTICAE ARE REPORTED. REGARDING TOXICITY, THE ETHYL ACETATE FRACTION AT 250 PPM AND THE N-HEXANE FRACTIONS AT 250 PPM AND 100 PPM CAUSED THE GREATEST ACCUMULATED MORTALITY RATE WHEN APPLICATION WAS MADE STARTING DURING THE LARVAL STAGE. RESULTS SHOWED THAT EVEN AT THE LOWEST EVALUATED CONCENTRATION (10 PPM), BOTH FRACTIONS CAUSED A SIGNIFICANT DECREASE IN THE T. URTICAE POPULATION. THE N-HEXANE FRACTION CAUSED 100 % REPELLENCY AT 50 PPM AND REPELLENCY SIGNIFICANTLY SUPERIOR TO THE CONTROL AT 10 PPM. RELATIVELY LOW ACTIVITY WAS FOUND WHEN TREATMENTS WERE APPLIED DIRECTLY TO ADULTS. IN ADDITION, RESULTS SUGGEST THAT THE CUMULATIVE MORTALITY COULD HAVE BEEN CAUSED BY STARVATION DUE TO THE OBSERVED REPELLENCY AND THE WELL-KNOWN DETERRENT ACTIVITY OF PHYTOECDYSTEROIDS (PES) FOUND IN THE EXTRACTS. FOUR PES FROM THE B. CORDATUM N-HEXANE FRACTION WERE ISOLATED: ECDYSONE, PONASTERONE A, SHIDASTERONE AND 2-DEOXYCRUSTECDYSONE.
dc.formatapplication/pdf
dc.identifier.doi10.25100/socolen.v45i2.7957
dc.identifier.issn0120-0488
dc.identifier.urihttps://repositorio.ubiobio.cl/handle/123456789/10917
dc.languagespa
dc.publisherREVISTA COLOMBIANA DE ENTOMOLOGIA
dc.relation.uri10.25100/socolen.v45i2.7957
dc.rightsPUBLICADA
dc.titleACARICIDAL ACTIVITY AND REPELLENCY OF BLECHNUM CORDATUM (BLECHNACEAE) AGAINST TETRANYCHUS URTICAE (ACARI: TETRANYCHIDAE)
dc.title.alternativeACTIVIDAD ACARICIDA Y REPELENCIA DE BLECHNUM CORDATUM (BLECHNACEAE) CONTRA TETRANYCHUS URTICAE (ACARI: TETRANYCHIDAE)
dc.typeARTÍCULO
dspace.entity.typePublication
ubb.EstadoPUBLICADA
ubb.Otra ReparticionDEPARTAMENTO DE CIENCIAS BASICAS
ubb.Otra ReparticionDEPARTAMENTO DE CIENCIAS BASICAS
ubb.SedeCHILLÁN
ubb.SedeCHILLÁN
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