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.
Highlights
The mites in Tetranychidae family are mostly polyphagous, being found on several crops, such as fruits, ornamental and leguminous, besides spontaneous plants, which mayPágina | 3811 act as alternative hosts and a focus for the spread of mites (VASQUÉZ et al, 2009)
Recent information based on T. bastosi fertility life tables on C. papaya, P. vulgaris and M. esculenta points out to significant reproduction and population growth rates, exhibiting a high potential of colonization (LIMA et al, 2017)
The objective of this study was to register the occurrence of T. bastosi as well as to evaluate the instantaneous rate of increase on its host plants in the state of Alagoas
Summary
The mites in Tetranychidae family are mostly polyphagous, being found on several crops, such as fruits, ornamental and leguminous, besides spontaneous plants, which mayPágina | 3811 act as alternative hosts and a focus for the spread of mites (VASQUÉZ et al, 2009). The Northeast of Brazil is the most abundant region regarding T. bastosi host plants, including different botanical families, such as Moraceae (Morus nigra L.), Asteraceae (Birdens pilosa L.), Euphorbiaceae (Jatropha gosypifolia L., Jatropha curcas L., Jatropha molíssima (Pohl) Baill, Ricinus communis L., Cnidoscolus phyllacanthus Pax and Hoffmann, Manihot esculenta Crantz and Manihot pseudoglaziovii Pax e Hoffman), Malvaceae Recent information based on T. bastosi fertility life tables on C. papaya, P. vulgaris and M. esculenta points out to significant reproduction and population growth rates, exhibiting a high potential of colonization (LIMA et al, 2017). The objective of this study was to register the occurrence of T. bastosi as well as to evaluate the instantaneous rate of increase (ri) on its host plants in the state of Alagoas
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