Wheat nitrogen fertilisation effects on the performance of the cereal aphid Metopolophium dirhodum
The effects of five rates of nitrogen fertiliser applications on the performance of the cereal aphid Metopolophium dirhodum on winter wheat, within the range of rates recommended for UK crops, were investigated over two seasons in field-grown crops and also on plants grown in the glasshouse. Longevity was unaffected by the level of fertilisation, but aphid intrinsic rate of increase and fecundity increased with each level applied. In the second field season, when a higher upper limit was used, many of these increases were significant. A previously unreported finding for this species was that there was a significant decrease in fecundity for the highest rate of fertilisation. Results for the glasshouse-reared aphids followed a similar pattern to those in the field, and overall they underline recent reports in the literature of the negative effects of high nutrient concentrations on the performance of herbivorous insects. The underlying reasons for these are discussed.... [Show full abstract]
Keywordsfecundity; phloem sap; winter wheat; nitrogen fertiliser; insects; intrinsic rate of increase; aphids
Fields of Research0701 Agriculture, Land and Farm Management; 0502 Environmental Science and Management; 0703 Crop and Pasture Production
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