Biology of Neoseiulus californicus feeding on two-spotted spider mite

Abstract

ResumoBiologia de Neoseiulus californicus alimentando-se de ácaro rajado. Tetranychus urticae (Koch) destaca-se por ser um ácaro polífago. Em morangueiro, esse ácaro desenvolve-se na face inferior das folhas, causando lesão significativa. Este estudo teve por objetivo conhecer as características biológicas de Neoseiulus californicus (McGregor), proveniente de plantas de morangueiro cultivado. O estudo iniciou-se com trinta ovos individualizados em arenas com diferentes estágios de T. urticae como alimento. A duração média de ovo-adulto foi maior para fêmeas (5,69±0.08) do que para machos (5,35±0.11). A razão sexual foi de 0,66 e capacidade inata de aumento (rm) foi de 0,15 fêmea/fêmea/dia. A taxa líquida de reprodução (R o ) foi 17,10 vezes/geração, com uma média a cada geração (T) de 19,35 dias. Maior oviposição foi observada no 11º dia após o seu início, com 2,7 ovos/fêmea/dia e a média foi de 38,14±5,58 ovos/fêmea. A razão finita de aumento (λ) foi 1,41 fêmea/ dia. Neoseiulus californicus mostrou reproduzir-se adequadamente quando alimentado com T. urticae. Palavras-chave: Controle biológico; Fragaria sp.; Inimigo natural; Tabela de vida; Tetranychus urticae AbstractTetranychus urticae (Koch) stands out as a polyphagous mite. In a strawberry plant, this mite develops on the underside of leaves, causing a significant injury. This study aimed to know the biological characteristics of Neoseiulus californicus (McGregor), from cultivated strawberry plants. The study started with thirty eggs isolated in arenas with different stages of T. urticae. The average length of egg-adult was higher for females (5.69±0.08) than for males (5.35±0.11). The sex ratio was 0.66 and the innate capacity for increase (rm) was 0.15 female/ female/day. The net reproductive rate (R o ) was 17.10 times/generation, with an average to each generation (T) of 19.35 days. Greater oviposition was observed at the 11 th day after its onset, with 2.7 eggs/female/day and the average was 38.14±5.58 eggs/female. The finite increase rate (λ) was 1.41 female/day. Neoseiulus californicus showed to reproduce properly when feeding on T. urticae.

Biological performance of the predatory mite Neoseiulus idaeus (Phytoseiidae): a candidate for the control of tetranychid mites in Brazilian soybean crops

“…Neoseiulus californicus fed on T. ludeni, presented higher net reproductive rate (Escudero and Ferragut, 2005) than the net reproductive rate presented in this work. However, Toldi et al (2013) observed a similar result, when such predator was fed on T. urticae.…”

“…Escudero and Ferragut (2005) studied N. californicus fed on T. ludeni and obtained higher results. Toldi et al (2013) also obtained higher results when N. californicus was fed on T. urticae.…”

“…Escudero and Ferragut (2005) observed lower egg-adult phase length testing N. californicus fed on T. ludeni (4.67 days). In contrast, when fed on T. urticae, such predator presented greater length (Toldi et al, 2013). The predator mean fertility was significantly lower when fed on M. planki (4.6±1.58 eggs/female) and higher when fed on T. urticae (26.2±2.41 eggs/female).…”

“…Escudero and Ferragut (2005), obtained higher results utilizing N. californicus feeding on T. ludeni. Toldi et al (2013) also studied N. californicus fed on T. urticae, however they obtained lower results than those presented by Escudero and Ferragut (2005).…”

“…Escudero and Ferragut (2005) tested N. californicus with T. ludeni as food source and obtained a lower fecundity rate (2.62 eggs/female). However, Toldi et al (2013) tested such predator mite fed on T. urticae, and obtained a higher fecundity rate (38.14±5.58 eggs/female).…”