REPRODUCTIVE INCOMPATIBILITY BETWEEN TWO SUBSPECIES OF COLEOMEGILLA MACULATA (COLEOPTERA: COCCINELLIDAE)

There is interest in introducing the midwestern subspecies of Coleomegilla maculata (DeGeer), C. m. lengi Timberlake, as a biological control agent for augmentation programs in Florida. The Division of Plant Industry (DPI) of the Florida Department of Agriculture and Consumer Services has prohibited...

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Bibliographic Details
Published in:The Florida entomologist 2002-03, Vol.85 (1), p.203-207
Main Authors: Pérez, Oscar G, Hoy, Marjorie A
Format: Article
Language:English
Subjects:
augmentation
Beetles
biological control
biological control agents
C. m. lengi
Coleomegilla maculata
Coleomegilla maculata fuscilabris
coleomegilla maculata lengi
crossing
egg hatchability
Eggs
Female animals
hatch
incompatibility
Insect eggs
Insect larvae
Male animals
mortality
oviposition
population
Predation
Predators
predators of insect pests
reciprocal crosses
Relative humidity
Research Papers
Sex ratio
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Summary:There is interest in introducing the midwestern subspecies of Coleomegilla maculata (DeGeer), C. m. lengi Timberlake, as a biological control agent for augmentation programs in Florida. The Division of Plant Industry (DPI) of the Florida Department of Agriculture and Consumer Services has prohibited the release of C. m. lengi for fear that it could interbreed with the native Florida subspecies C. m. fuscilabris (Mulsant), causing genetic contamination or suppression of the C. m. fuscilabris populations. Two populations of these subspecies, fuscilabris from the southeastern USA and lengi from the midwestern USA, were crossed. Reciprocal single pair crosses were performed under controlled laboratory conditions (temperature, relative humidity and daylength) on two dates. Results demonstrated a nearly complete reproductive incompatibility between these two populations in the first generation (F1) and complete reproductive incompatibility in the second (F2). Further analysis is required to establish the cause of the reproductive incompatibility.
ISSN:0015-4040
1938-5102
DOI:10.1653/0015-4040(2002)085[0203:RIBTSO]2.0.CO;2