Cold Tolerance and Distribution of <i>Myllocerus undecimpustulatus undatus</i> (Coleoptera: Curculionidae) (Sri Lankan Weevil) in Florida

Abstract

Myllocerus undecimpustulatus undatus Marshall, the Sri Lankan weevil, is a serious plant pest with a wide range of hosts. It was first identified in the United States on Citrus sp. in Davie, Broward County, Florida, on 15 September 2000. This weevil has over 150 different host plant species including fruits, nuts, vegetables, and ornamentals. It has been detected in 26 counties in Florida through December 2012. Historical data from 2000–15 obtained from the Division of Plant Industry’s field agent submissions indicate the northward spread of the Sri Lankan weevil in North America. Cold tolerance data indicate adults are acclimated to lower temperatures until reaching 0 °C and–5 °C. A sustained and multiple exposure experiment that more closely resembles actual cold events in Florida and other potential areas tested insects gathered in summer and winter to determine increased cold hardiness. This may provide valuable information to assist Extension agents and pest management professionals in preparing control strategies.