Fitness costs associated with milbemectin resistance in the two-spotted spider mite Tetranychus urticae

Autor(es)

Nicastro, Roberto Lomba ^[1] ; Sato, Mario Eidi ^[1] ; da Silva, Marcos Zatti ^[1]

Afiliação do(s) autor(es)

^[1] Inst Biol, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF PEST MANAGEMENT; v. 57, n. 3, p. 223-228, 2011.
• Citações Web of Science: 7

Resumo

The two-spotted spider mite Tetranychus urticae Koch is one of the most important pests of a wide range of crops worldwide. Its control is still largely based on the use of acaricides. However, due to its short life-cycle, high fecundity and arrhenotokous reproduction, it is able to develop resistance to these compounds very rapidly. Preliminary studies for milbemectin resistance in T. urticae showed that, under laboratory conditions, such resistance was unstable in the absence of a selection pressure. The aim of this study was to evaluate the possible fitness costs associated with milbemectin resistance in T. urticae. Comparison of biological traits between resistant and susceptible strains indicated the occurrence of fitness costs associated with milbemectin resistance. The resistant strain showed a longer juvenile development period for females, lower fecundity and a higher proportion of males among the progeny. The figures for net reproductive rate (R(0)), intrinsic rate of natural increase (r(m)) and finite rate of increase (lambda) were higher in the susceptible strain. The instability of milbemectin resistance can be exploited in resistance management programmes. (AU)

• Processo FAPESP: 07/02748-1 - Resistência de Tetranychus urticae Koch aos acaricidas milbemectin e abamectin e manejo do ácaro-praga em morangueiro e ornamentais com utilização de ácaros predadores da família Phytoseiidae
• Beneficiário: Roberto Lomba Nicastro
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 07/08612-4 - Estudos de resistência de tripes (Frankliniella occidentalis) e ácaros (Tetranychus urticae) a pesticidas, em diversas culturas, e preferência hospedeira destas pragas em ornamentais no estado de São Paulo
• Beneficiário: Mário Eidi Sato
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/08789-7 - Influência de ácaros predadores da família Phytoseiidae na interação entre ácaro vetor, vírus da leprose e planta de citros
• Beneficiário: Marcos Zatti da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado