Journal of Taiwan Agricultural Research

Author:Jih-Zu Yu and Bing-Huei Chen*

Abstract:

Experiments were conducted to assess the effect of adding concealments and regulating density on the development and survival of Lemnia biplagiata (Swartz) by rearing larvae with a 12-litre container at 25℃ in laboratory. Results showed that adding concealments increased the survival rate of larva, prepupa and pupa were 51.4-56.0%, 80.3-81.6 and 83.4-93.7%, respectively, which was 41.8%, 77.0% and 78.9% respectively higher than the control without adding concealments. But there was no significant effect on the development time of larva and pupa, and body weight of adult. Adding corrugated paper or plastics as concealments had similar effect that increased the survival rate, but the pupal survival rate of the former was slightly higher. Low rearing density, 100 larva per container, had the highest survival rate of 74.3% and 91.8% for larva and prepupa, respectively. There was no significant difference among three rearing densities in terms of pupal survival rate which was 93.5-94.6%. Rearing 100-200 larvae in a container was appropriate when space and facility were considered. In general, larva having the lowest survival rate was the main fatal stage during group rearing following by prepupa and pupa.

Key words:Lemnia biplagiata (Swartz), Aphid, Group rearing, Concealment

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