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首页> 外文期刊>Weed technology: A journal of the Weed Science Society of America >Impact of fall and early spring herbicide applications on insect injury and soil conditions in no-till corn.
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Impact of fall and early spring herbicide applications on insect injury and soil conditions in no-till corn.

机译：Impact of fall and early spring herbicide applications on insect injury and soil conditions in no-till corn.

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Field studies were established at two Missouri (USA) locations in 2004 and 2005 to evaluate the effects of autumn and early spring herbicide applications on soil temperature, soil moisture content, and insect injury in no-till maize production systems. Both experiments received applications of simazine plus 2,4-D, rimsulfuron plus thifensulfuron plus 2,4-D, and glyphosate plus 2,4-D in autumn, and at 45, 30 and 7 d prior to planting (DPP). From 1 to 14 April, simazine plus 2,4-D applied 45 d EPP resulted in higher soil temperatures at a 5-cm depth compared to the untreated control. However, there were few differences in soil temperature present from 15 April to 1 May. Soil moisture readings taken during this same time period correlated with soil temperature readings. Measurements of soil moisture taken at one and 3 weeks after planting (WAP) revealed significantly lower soil moisture readings in the untreated compared to the herbicide-treated plots. This lower soil moisture content allowed untreated plots to warm up more rapidly and thereby eliminated any negative impacts that dense stands of winter annual weeds may have had on soil temperature. Evaluations of maize flea beetle (Chaetocnema pulicaria) and lepidopteran injury taken at the V2, V4, and V6 leaf stages revealed significant differences in injury as a result of these treatments. When dense stands of winter and summer annual weeds were left uncontrolled, the maize flea beetle injury was significantly lower than in plots treated with a herbicide. However, when a post herbicide application was made to remove all the weed species prior to the V6 sampling date, differences in maize flea beetle injury between the untreated and herbicide-treated plots were eliminated. Additionally, removal of all the weed species led to higher lepidopteran injury in the untreated.

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