Western Corn Rootworm - Spindletop 2006

Ric Bessin Extension Entomologist, Department of Entomology, University of Kentucky

 

WESTERN CORN ROOTWORM CONTROL IN CORN, 2006: Six insecticide treatments were evaluated for control of western corn rootworm larvae in continuous corn.  The test plot was planted following sixteen years of continuous corn on the UK Spindletop Research Farm in Fayette Co., KY, on16 May as a RCB with 4 replicates.  Individual sub-plots consisted of single row of corn, 25 m long, with 76.2 cm row spacing. The corn hybrid used for all treatments was N67-D6 at a seeding rate of 29,500 kernels per acre. All insecticide treatments were applied at planting except the seed treatments which were custom applied prior to the seed before planting.  Stand counts from the entire plots were recorded on 16  Jun. Five roots were examined from each plot for rootworm damage and scored on the 0 to 3.0 root node injury scale on 29 Jun. Data were subject to ANOVA and treatment means compared by LSD (SAS Institute).

 

 

All of the insecticides treatments significantly reduced root injury and improved stand counts relative to the control treatment. However, only the Fortress 5 G treatment significantly improved yield over the control.

 

 

From University of Kentucky, Extension Entomology Research Reports at: http://pest.ca.uky.edu/EXT/Res/ResPubs.shtm