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Dispersal and variation in infestation intensities of water hyacinth moth sameodes albiguttalis lepidoptera pyralidae populations in peninsular florida usa

, : Dispersal and variation in infestation intensities of water hyacinth moth sameodes albiguttalis lepidoptera pyralidae populations in peninsular florida usa. Environmental Entomology 13(2): 482-491

S. albiguttalis (Warren), a pyralid moth released in Florida for the biological control of waterhyacinth, Eichhornia crassipes (Mart.) Solms, in 1977, established several populations mostly in south Florida, and by Jan. 1979 these began to expand. Within 18 mo. S. albiguttalis could be found throughout the peninsular portion of the state. The most dramatic dispersal period occurred during midsummer 1979, when range extension averaged .apprx. 4 km .cntdot. day-1. After the dispersal phase, population intensities varied seasonally and geographically and were somewhat dependent upon the type of waterhyacinth plant present. Analysis of data to remove the effects of plant type indicated higher populations in the south during spring and summer than during winter and fall. The reverse was true in the north, and little seasonal variation occurred in the central pat of the state. Established populations persisted throughout the state in spite of a very cold winter in the northern regions.


DOI: 10.1093/ee/13.2.482

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