Toxicity of imidacloprid, thiamethoxam and deltamethrin to Palmistichus elaeisis (Hymenoptera: Eulophidae)

Autor: Costa, Elizangela Souza Pereira
Přispěvatelé: Soares, Marcus Alvarenga, Santos, Concei??o Aparecida dos, Veloso, Ronnie Von dos Santos, Assis J?nior, Sebasti?o Louren?o de, Vieira, Estela Rosana Dur?es, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
Jazyk: portugalština
Rok vydání: 2020
Předmět:
Zdroj: Repositório Institucional da UFVJM
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)
instacron:UFVJM
Popis: rea de concentra??o: Produ??o Vegetal. Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2021-03-26T20:24:33Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) elizangela_souza_pereira_costa.pdf: 562963 bytes, checksum: 206631c84e407fd7fd9390321d7fd851 (MD5) Approved for entry into archive by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2021-03-26T20:33:23Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) elizangela_souza_pereira_costa.pdf: 562963 bytes, checksum: 206631c84e407fd7fd9390321d7fd851 (MD5) Made available in DSpace on 2021-03-26T20:33:23Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) elizangela_souza_pereira_costa.pdf: 562963 bytes, checksum: 206631c84e407fd7fd9390321d7fd851 (MD5) Previous issue date: 2020 Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG) O uso indiscriminado de inseticidas qu?micos para controlar insetos pragas na agricultura e no setor florestal pode afetar, negativamente, popula??es de inimigos naturais, por isso inseticidas seletivos devem ser priorizados em programas de manejo integrado de pragas. Parasitoides s?o importantes inimigos naturais que ajudam a manter o equil?brio nos agroecossistemas e atuam no controle de insetos pragas. Inseticidas qu?micos devem ser t?xicos para a praga e in?cuos para o agente de controle biol?gico para que a associa??o do controle qu?mico e biol?gico seja bem-sucedida. O objetivo do trabalho foi avaliar a toxicidade aguda do imidacloprido, tiametoxam e deltametrina e os efeitos sobre a biologia do endoparasitoide Palmistichus elaeisis Delvare & LaSalle (Hymenoptera: Eulophidae) em tr?s gera??es. A toxicidade aguda para P. elaeisis foi determinada pela estimativa da CL50 por meio de ensaios de dose-resposta por 48h de exposi??o. Os efeitos sobre a capacidade de parasitismo e a taxa de emerg?ncia para P. elaeisis ap?s a exposi??o a CL10 e CL50 de inseticidas neonicotinoides e piretroide foram avaliadas. Pupas de Tenebrio molitor Linnaeus (Coleoptera: Tenebrionidae) usadas como hospedeiros alternativos foram contaminadas com inseticidas e ofertadas a P. elaeisis. Os par?metros biol?gicos como a capacidade de parasitismo, emerg?ncia, raz?o sexual, dura??o do ciclo biol?gico e a sobreviv?ncia foram avaliados por tr?s gera??es. Os tr?s inseticidas foram t?xicos a P. elaeisis, ocasionando aumento da mortalidade proporcionalmente ao aumento das concentra??es. O parasitismo e emerg?ncia de P. elaeisis n?o foram reduzidos quando f?meas foram contaminadas por contato com o imidacloprido e o tiametoxam, mas com a deltametrina n?o houve indiv?duos emergidos. A capacidade de parasitismo por P. elaeisis n?o foi afetada, mas a taxa de emerg?ncia foi significativamente reduzida. A raz?o sexual e o ciclo biol?gico foram significativamente afetados, com aumento do n?mero de dias para completar o ciclo biol?gico. O risco de morte foi alto para todos os tr?s inseticidas e efeitos subletais podem ser observados at? a terceira gera??o. Tese (Doutorado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2020. Indiscriminate use of chemical insecticides to control insect pests in the agricultural and forestry sector, can negatively affect natural enemies populations, thereby selective insecticides should be prioritized in integrated pest management programs. Parasitoids are important natural enemies that contribute positively to maintain ecological balance in the agroecosystem particularly in the control of insect pests. Chemical insecticides must be toxic to the pest and harmless to the biological control agent to successful association of chemical and biological control. The objective of this work was to evaluate the acute toxicity of imidacloprid, thiamethoxam and deltamethrin, and the effects on the biology of the endoparasitoid Palmistichus elaeisis Delvare & LaSalle (Hymenoptera: Eulophidae) throughout three generations. The acute toxicity for P. elaeisis was determined by the CL50 estimative from dose-response bioassay for 48 hours of exposure. The effects on parasitism capacity and emergence rate of P. elaeisis after CL10 and CL50 exposure to neonicotinoids insecticides and pyrethroid were evaluated. Pupae of Tenebrio molitor Linnaeus (Coleoptera: Tenebrionidae) used as an alternative host were contaminated with insecticides and offered to P. elaeisis. The biological parameters such as parasitism capacity, emergence rate, sex ratio, duration of the biological cycle and survival were evaluate throughout three generations. The three insecticides were toxic to P. elaeisis, causing an increase in mortality with increasing level of exposure. Parasitism and emergence were not reduced when they were contaminated by contact with imidacloprid and thiamethoxam, but with deltamethrin there were no emergencies. P. elaeisis parasitism capacity was not reduced on the other hand emergence rate was significantly reduced. Insecticide exposure The sex ratio and the biological cycle was significantly affected, with increase in the number of days to complete the biological cycle. The risk of death was high for all three insecticides and sublethal effects can be observed up to the third generation of P. elaeisis.
Databáze: OpenAIRE
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