Biologia e tabela de vida do ácaro-vermelho Tetranychus bastosi em pinhão-manso

Abstract

Resumo -O objetivo deste trabalho foi determinar a biologia e a tabela de vida de Tetranychus bastosi em pinhão-manso (Jatropha curcas). O experimento foi realizado em ambiente controlado a 26ºC e 75% de UR, com fotófase de 12 horas. Os ovos usados nos experimentos foram oriundos de criação estoque. As avaliações foram realizadas duas vezes ao dia, para a biologia do ácaro, e uma vez, para os parâmetros reprodutivos. O ciclo médio de vida das fêmeas foi de 9,63 dias e o dos machos, de 8,94 dias. A razão sexual foi 0,65 e a longevidade média das fêmeas foi de 16 dias, com produção média de 59 ovos por fêmea. Os parâmetros de tabela de vida obtidos foram: taxa líquida de reprodução (R o ), 45,41 indivíduos; duração média das gerações (T), 12,66 dias; taxa intrínseca de crescimento (r m ), 0,0538 fêmea por fêmea por dia; razão finita de aumento (λ), 1,023 fêmea por fêmea; e tempo para duplicação da população (TD), 3,15 dias. O ácaro T. bastosi desenvolvese bem e apresenta alto potencial reprodutivo sobre folhas de pinhão-manso.Termos para indexação: Jatropha curcas, potencial reprodutivo, Tetranychidae. Biology and life table of the red spider mite Tetranychus bastosi on physic nutAbstract -The objective of this work was to determine the biology and life table of Tetranychus bastosi on physic nut (Jatropha curcas). The experiment was carried out under controlled conditions at 26ºC and 75% RH, with photophase of 12 hours. The eggs used in the experiments were obtained from stock culture. Evaluations were performed twice a day for the biology of the mite, and once a day for reproductive parameters. The average life cycle of females was 9.63 days and that of males was 8.94 days. The sex ratio was 0.65, and the mean longevity of females was 16 days, with average production of 59 eggs per female.

Geostatistics as a tool to study mite dispersion in physic nut plantations

“…R-strategist species explore resources in temporary patches, reveal high population growth rates and minimize interspecific competition (Southwood, 1962;Begon et al, 2005). Both P. latus and T. bastosi exhibit these traits, as they have high reproductive rates (Lopes, 2009;Evaristo et al, 2013;Pedro-Neto et al, 2013) and have characteristics that reduce the interspecific competition, including their behavior of attacking plants at different time periods. During colonization, individuals identify locations favorable to their offspring (Karban & Agrawal, 2002).…”

“…Thus, dispersion links the local population cycles of colonization and extinction of the individuals in ephemeral environments (Hanski, 1999). P. latus and T. bastosi colonize the leaves at their preferred site, the apex of the physic nut plants (Lopes, 2009; Evaristo et al , 2013; Pedro-Neto et al , 2013). Another reason for the mite migration to other plant species is that the physic nut plants are deciduous (Ulyshen, 2011).…”

Active prey mixing as an explanation for polyphagy in predatory arthropods: synergistic dietary effects on egg production despite a behavioural cost

“…; Pedro‐Neto et al . ). The predators are currently evaluated for their capacity to control the pests (Sarmento et al .…”

“…Its adult females are the largest stage, and they are c. 0Á5 mm long, whereas the eggs are spherical with a diameter of c. 0Á13 mm. These herbivorous mites and predators co-occur in plantations of the biodiesel plant Jatropha curcas L. in Brazil, where the pests cause severe yield reductions (Sarmento et al 2011;Pedro-Neto et al 2013). The predators are currently evaluated for their capacity to control the pests (Sarmento et al 2011).…”

Spatial-temporal distribution of phytophagous and predatory mites in the canopy of Jatropha curcas L.

“…Considering the potential use of Jatropha curcas L. for biofuel production (ALONSO; LEZCANO, 2014), integrated management studies of pest arthropods associated with this crop are necessary for optimizing its production. For example, phytophagous mites are usually reported to be potential pests of J. curcas (SARMENTO et al, 2011;CRUZ et al, 2013a;LOFEGO et al, 2013;PEDRO-NETO et al, 2013;ROSADO et al, 2015a;2015b;SARAIVA et al, 2015). Predatory mites, especially those in the family Phytoseiidae, also colonize J. curcas plants and play a key role in limiting phytophage population (SARMENTO et al, 2011).…”