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EVALUATION OF FOLIAR INSECTICIDES FOR CONTROL OF CORN BORERS IN FIELD CORN, 2009

2011; Oxford University Press; Volume: 36; Issue: 1 Linguagem: Inglês

10.4182/amt.2011.f24

2156-2385

Paul McLeod, Bill Apple,

Insect-Plant Interactions and Control

The objective of the study was to determine the effectiveness of insecticides applied to corn foliage against corn borers. Field corn ‘Pioneer 31P40’, a non-BT cultivar, was planted with a John Deere 7100 Maximerge planter at a rate of 2.2 seed per row ft at the Cotton Branch Experimental Station, Mariana, AR on 29 May 2009. Soil type was silt loam and had been planted to cotton in 2008. Plots consisted of one row 25 ft long. Plots were separated by 78 inches. Replications were separated by 5 ft bare ground buffers. The experimental design was RCB with four replications. Applications were timed by splitting corn stalks in adjacent plots and searching for corn borer pupae. All insecticide treatments except Hero (late silk) were applied on 2 Jul, one week after the first dark pupae were detected. Hero (late silk) was applied one week later. Insecticides were applied with a CO2 propelled backpack sprayer equipped with two Delvan HB10 nozzles. Spray volume was 19.4 gpa at 25 psi. Insecticide effectiveness was assessed as follows. On 10 Sep ten randomly selected plants were cut at soil level from each plot. Each stalk was split with a band saw and the length of tunnels from corn borers was measured for each stalk. Any stalk with evidence of tunneling was considered infested. Ears were pulled, threshed by hand and seed were counted and weighed.