História de vida de Tetranychus bastosi Tuttle, Baker & Sales, 1977 (Acari: Tetranychidae) no estado de Alagoas

Abstract

Tetranychus bastosi Tuttle, Baker & Sales, 1977 (Acari: Tetranychidae) was described in the state of Ceará and until now the occurrence of this species is restricted to Brazil. It is a phytophagous mite registered in more than 36 plant hosts, including species of agricultural importance. Thus, the objectives of this study were to report for the first time the occurrence of T. bastosi in the state of Alagoas, in addition to evaluate the life history of T. bastosi in different hosts. In Alagoas, T. bastosi was reported for the first time, infesting plants of Turnera subulata L. and Ipomoea batatas L., causing significant damage. The population growth of T. bastosi showed positive values of 0.35 ± 0.02 and 0.21 ± 0.09 for I. batatas and T. subulata, respectively, with significant differences between them. To the study of the life history of T. bastosi, the parameters duration and survival of immature stages, longevity and fecundity were evaluated. From the results, fertility life tables were prepared for three plant species: Morus rubra L., the host from which this mite was described in Brazil; I. batatas, the first reported host in the state of Alagoas; and Psidium guajava L., a host reported for the Northeast of Brazil. Instantaneous rates of growth (ri), feed and oviposition preferences were also evaluated for T. bastosi. The incubation period of T. bastosi eggs was longer on M. rubra (5.6 days) followed by I. batatas (4.0 days) and P. guajava (4.0 days). The longest larval period was observed on P. guajava (5.7 days). The longest durations of the protonymph and deutonymph stages were observed in P guajava (3 days) and M. rubra (2.1 days), respectively. The longest period from egg to adult of T. bastosi was observed on I. batatas (12.8 days). The highest longevity of T. bastosi was observed on I. batatas and M. rubra (39.7 and 30.2 days, respectively). The mite T. bastosi showed the highest net rate (Ro) on I. batatas (15.5 days) and longest mean duration of a generation (T) on M. rubra (21.3 days), but the highest innate capacity for population increase (rm) and finite rate of increase (λ) were observed on I. batatas (0.15 and 1.16, respectively). The host preference tests indicated that there was a preference of T. bastosi for P. guajava in all of the analyzed periods and bioassays, however, no preference for oviposition was observed among the hosts. The instantaneous rate of growth (ri) of T. bastosi showed positive values of 0.350 ± 0.01 and 0.275 ± 0.012 for I. batatas and M. rubra, respectively, however a negative rate of -0,082± 0,02 was observed for the host P. guajava. Keywords: Red spider mite, biological parameters, populational growth, fertility life table.