Occurrence and instantaneous rate of increase of Tetranychus bastosi Tuttle, Baker & Sales (Acari: Tetranychidae) in the state of Alagoas, Brazil

• Author(s): Lima, Renata Pereira de ; Breda, Mariana Oliveira
• Date: 2021
• Origin: Oasisbr
• Document Type: Journal article
• Language: Portuguese

Description

Tetranychus bastosi Tuttle, Baker & Sales (Acari: Tetranychidae) is a species with restricted occurrence in Brazil and has already been reported infesting 36 species of plants, including ornamental, fruits, leguminous and spontaneous plants. In Alagoas state, its presence was found on Turnera subulata L. and Ipomoea batatas L. To analyse the population growth of T. bastosi on the hosts, bioassays were carried out evaluating the instantaneous rate of increase (ri). For both hosts, the population growth of T. bastosi showed positive values of 0.3509 ± 0.0239 and 0.2179 ± 0.0934 for I. batatas and for T. subulata, respectively, with significant differences between them. In addition, significant differences were observed for the mean number of eggs, nymphs, and the final population after 10 days of evaluation. Thus, it is registered the presence o T. bastosi in the state of Alagoas with high potential of development on I. batatas and T. subulata.

ABSTRACT: Tetranychus bastosi Tuttle, Baker & Sales (Acari: Tetranychidae) is a species with restricted occurrence in Brazil and has already been reported infesting 36 species of plants, including ornamental, fruits, leguminous and spontaneous plants. In Alagoas state, its presence was found on Turnera subulata L. and Ipomoea batatas L. To analyse the population growth of T. bastosi on the hosts, bioassays were carried out evaluating the instantaneous rate of increase (ri). For both hosts, the population growth of T. bastosi showed positive values of 0.3509 ± 0.0239 and 0.2179 ± 0.0934 for I. batatas and for T. subulata, respectively, with significant differences between them. In addition, significant differences were observed for the mean number of eggs, nymphs, and the final population after 10 days of evaluation. Thus, it is registered the presence o T. bastosi in the state of Alagoas with high potential of development on I. batatas and T. subulata. KEYWORDS: population growth, red spider mite, host plant   RESUMO: Tetranychus bastosi Tuttle, Baker & Sales (Acari: Tetranychidae) é uma espécie com ocorrência restrita ao Brasil, sendo relatada infestando 36 especies de plantas, incluindo plantas ornamentais, frutíferas, leguminosas e plantas espontâneas. No estado de Alagoas, foi recentemente encontrado em Turnera subulata L. e Ipomoea batatas L. Para analisar o crescimento populacional de T. bastosi nas plantas hospedeiras, bioensaios foram realizados para avaliar a taxa instantânea de crescimento (ri). Para ambos os hospedeiros, o crescimento populacional de T. bastosi  mostrou valores positivos de 0.3509 ± 0.0239 e 0.2179 ± 0.0934 para I. batatas e para T. subulata, respectivamente, com diferenças significativas entre eles. Além disso, diferenças significativas foram observadas para os números médios de ovos, ninfas e da população final após 10 dias de avaliação. Assim, registra-se a presença de T. bastosi no estado de Alagoas, apresentando alto potencial de desenvolvimento em I. batatas e T. subulata. PALAVRAS-CHAVE: crescimento populacional, ácaro vermelho, planta hospedeira.