Effects of two planting dates and three tillage systems on the abundance of lesser cornstalk borer (Lepidoptera: Pyralidae), other selected insects, and yield in peanut fields
1990
Mack, T.P. | Backman, C.B.
The effect of planting date and tillage system on the abundance of several insects in 'Florunner' peanuts (Arachis hypogaea L.) was examined in a 2-yr replicated field experiment. Two planting dates (late May and mid-June) and three tillage systems (conventional, reduced, and burned stubble) were evaluated. The abundance of the lesser cornstalk borer, Elasmopalpus lignosellus (Zeller), elaterids, carabids, and labidurids was monitored weekly with pitfall traps. Counts of lesser cornstalk borer, labidurid, carabid, and elaterid varied with year. Counts of lesser cornstalk borers and carabids were significantly greater in 1986 than in 1987, whereas counts of elaterids and labidurids were greater in 1987. Approximately 1.9 times more lesser cornstalk borers were captured in traps from late-planted peanuts in both years. Labidurid abundance was unaffected by planting date. Carabids were more abundant in late-planted peanuts in 1987, but planting date did not affect abundance in 1986 or when data from both years were combined. Tillage system did not affect the abundance of any of the insects monitored in either year. These experiments indicate that planting early should effectively decrease lesser cornstalk borer abundance in conventionally tilled and reduced-tillage peanuts.
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