| Popis: |
Insecticides were evaluated for control of second-generation southwestern corn borer (SWCB) on irrigated corn at the Panhandle Research Station, Goodwell, Oklahoma. Each treatment was applied to plots measuring 7 ft 40 ft and replicated four times in a RCB design. Plots were planted on 12 May with a John Deere MaxEmerge planter at 34,000 plants per acre into a Richfield clay loam soil. On 2 Aug, pretreatment counts of egg masses collected during pollen shed indicated SWCB populations had exceeded the economic threshold of 25% infested plants. Insecticide treatments were applied on 3 Aug with a CO2-charged hand held sprayer through 0015 flat fan nozzles at 30 psi for a total volume of 20 gpa. On 9 Sep, 10 plants per plot were split from root to tassel and evaluated for the number and length of borer-induced tunnels and borer larvae. Treatments were compared using ANOVA and individual means distinguished using Fisher's Protected LSD. |
