Life table analysis and consumption capacity for Harmonia axyridis (Coleoptera: Coccinellidae), feeding on Cinara atlantica (Hemiptera: Aphididae)
Keywords:
biological control, cannibalism, Cinara atlantica, development, life tableAbstract
The objective of this study was to analyze the development, reproductive parameters and consumption capacity of Harmonia axyridis, using Cinara atlantica as food. The average time of egg incubation was 3 d, duration of larval instars was 3.5, 2, 2.2 and 4.1 d, respectively, and duration of the pupal stage was 5.8 d. Longevity was 85.6 d and the life cycle lasted 107.2 d. Egg viability was 92.7% and all stages had 100% survival. Adults consumed, on average, 1.892 aphids. Pre-oviposition, oviposition and post-oviposition periods lasted 6.8, 44.3, and 32.9 d, respectively. Fertility was 633.2 eggs per female. Each instar consumed, on average, 19.4, 24.8, 49.7 and 188.9 aphids, respectively. The life table results, together with biological data, indicated that Harmonia axyridis is an efficient predator of C. atlantica, having high fertility, egg viability, rapid development and high levels of predation.
O objetivo deste estudo foi analisar o desenvolvimento, os parâmetros reprodutivos e a capacidade de consumo de Harmonia axyridis, utilizando Cinara atlantica como alimento. O tempo médio de incubação dos ovos foi de 3 dias, duração dos estágios larvais foi de 3,5, 2, 2,2 e 4,1 dias, respectivamente, e a duração da fase de pupa foi de 5,8 dias. A longevidade foi de 85,6 dias e o ciclo de vida durou 107,2 dias. A viabilidade dos ovos foi de 92,7% e em todas as fases a sobrevivência foi de 100%. Os adultos consumiram, em média 1892 pulgões. Os períodos de pré-oviposição, oviposição e pós-oviposição duraram 6,8, 44,3, e 32,9 dias, respectivamente. A fertilidade foi 633,2 ovos por fêmea. Cada instar consumiu, em média, 19,4, 24,8, 49,7 e 188,9 pulgões, respectivamente. Os resultados da tabela de vida, juntamente com os dados biológicos, indicaram que Harmonia axyridis é um predador eficiente de Cinara atlantica, com alta fertilidade, viabilidade dos ovos, desenvolvimento rápido e altos níveis de predação.
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