Monday, December 10, 2007 - 9:05 AM

Effect of temperature on the life cycle of lesser cornstalk borer, Elasmopalpus lignosellus Zeller (Lepidoptera: Pyralidae), on sugarcane

Hardev Singh Sandhu, gnuessly@ufl.edu1, Gregg S. Nuessly,, Ronald H. Cherry, Pinesnpets@aol.com2, Susan Webb, sewe@ufl.edu3, and Robert Gilbert, rgilbert@ufl.edu2. (1) University of Florida, Entomology and Nematology, 970 Natural Area Drive, P.O. BOX 110620, Gainesville, FL, (2) University Of Florida, Everglades Research and Education Center, 3200 E. Palm Beach Rd, Belle Glade, FL, (3) University of Florida, Entomology & Nematology Natural Area Drive, PO Box 110620, Gainesville, FL

Lesser cornstalk borer (Elasmopalpus lignosellus Zeller)(Lepidoptera: Pyralidae) is an important sugarcane pest throughout tropical and subtropical regions of the New World. The semi-subterranean larval stage feeds on sugarcane at or below the soil surface causing damage to seed pieces, buds, shoots and young plants. Biological data on development, oviposition periods and egg placement, fecundity and longevity are needed on sugarcane to improve integrated management of this pest. Studies were conducted in the laboratory at 21, 24, 27 and 30C. Duration of egg, larval, and pupal stages decreased significantly with increase in temperature. Pre-oviposition and post-oviposition periods increased, and ovipositional period decreased significantly at low temperature (21C). Ovipositional period was longer at 27C than other temperature conditions tested. Fecundity and survival rate also increased with an increase in temperature. The majority of eggs were deposited in the soil near plant bases, but some were deposited on the adaxial surface of lower leaves and on the stem.

Species 1: Lepidoptera Pyralidae Elasmopalpus lignosellus (lesser cornstalk borer)