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ISHS Acta Horticulturae 288: VI International Symposium on Pollination

STUDIES ON THE BIOLOGY OF SPHAEROPHORIA SCRIPTA L. (DIPTERA., SYRPHIDAE)

Authors:   S. Nengel, W. Drescher
DOI:   10.17660/ActaHortic.1991.288.10
Abstract:
The hoverfly Sphaerophoria scripta L. (Dipt., Syrphidae) is one of the most frequent species in Central Europe. To analyse its biology laboratory experiments were performed. The survival rate from egg stage to third larval instar amounted to 31.7%, from third larval instar to pupation 53.5% and from pupal stage to emergence of the adult hoverflies 80.6%. So 13.7% of the deposited eggs develop to maturity. With pollen additive to the food of the adult hoverflies females had an average lifespan of 31.1 days and males of about 12.4 days. The average number of eggs laid by females was 365 eggs. Without pollen feeding females lived only 9.5 days and males 7.5 days. The females produced no eggs. Influence of temperatures on the speed of egg- and pupal development was investigated.

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