LEAD PARAGRAPH - George Polk, an inspector for the St. Tammany Parish Mosquito Abatement District in Slidell, 30 miles northeast of New Orleans, dips a long-handled ladle into a puddle beside a suburban lawn. He pulls out a cup of motionless black eggs and specks that wriggle like tadpoles. ''These are flood-water mosquitoes,'' Mr. Polk says.

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