Abstract
The occurrence of various presumably sympatric species of Nearctic yellowjackets was determined in widely separated areas. Long-term trapping with n -heptyl butyrate in California, Maryland, and Minnesota disclosed the presence of up to 6 sympatric species of Vespula in some localities. The most responsive included Vespula pensylvanica (Saussure), Vespula sulphurea (Saussure), and Vespula atropilosa (Sladen). Male yellowjackets, Vespula germanica (F.), Vespula maculifrons (Buysson), and Dolichovespula species were nearly unresponsive to synthetic attractants but trapping combined with net collection indicated additional sympatry in some localities. Traps revealed the presence of various species of Vespula in specific localities and traps were used to determine the relative seasonal abundance only of responsive species. The detection sensitivity of trapping may be enhanced by the simultaneous use of protein, carbohydrate or various synthetic attractants.
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