Sepedon macropus (Diptera: Sciomyzidae) Introduced into Hawaii as a Control for the Liver Fluke Snail, Lymnaea ollula1
Authors: CHOCK, Q. C.; DAVIS, C. J.; CHONG, M.
Source: Journal of Economic Entomology, Volume 54, Number 1, February 1961 , pp. 1-4(4)
Publisher: Entomological Society of America
Abstract:Liver fluke, Fasciola gigantica Cob bold, is the most important parasitic disease of beef and dairy cattle in the State of Hawaii and has been in the Islands since 189'2.The intermediate host of this parasite is the fresh water snail, Lymnaea (Fossaria) ollula Gould. Another aquatic' snail, Pseudosuccinea columella Say has proven to be a vector of liver fluke under laboratory conditions. Both snails are found in streams, taro paddies and swamp habitats. Because of the importance of this problem, Sepedonmacropus Walker was introduced in an attempt to control these aquatic snails.
Under Hawaiian climatic conditions, the life cycle of this predator is approximately 22 to 24 days. The egg stage is 8 days, larval stage 11 to 12 days and pupal stage 7 to 8 days. Two methods were employed in rearing the larvae and these consisted of the use of petri dishes and redwood troughs. The former was employed initially to increase the breeding stock, while the latter was applied later in order to obtain mass production.
Nutrition studies indicated that greater fecundity and longevity were obtained by a diet of ('rushed snails, water and honey, made available to the breeding stock. The males outlived the females; the average life span of the male was 100 days, that of the female was 69 days. The ratio of egg production as indicated in these studies was 184 eggs obtained in which the normal diet was honey and water as against 14,824 eggs, when crushed snails were added.
Releases of S. macropus have been made on the five major islands of the State, and to date recoveries of the fly have been reported only from Oahu and Kauai. In areas where establishment of the fly has occurred, usually half an hour of trapping will result in the capture of 50 to 100 flies, indicating the adaptability of this sciomyzid species to Hawaiian conditions. Judging by the encouraging progress taking place, it appears that this introduced predator may become an important contribution in the control of Fasciola gigantica in the State of Hawaii.
Document Type: Research Article
Publication date: February 1, 1961
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
- Editorial Board
- Submit a Paper
- Subscribe to this Title
- Information for Advertisers
- Visit this journal's homepage
- ingentaconnect is not responsible for the content or availability of external websites