Effects of organic and conventional fertilizer treatments on host selection by the aphid parasitoid Diaeretiella rapae
Article
Pope, T. W., Girling, R. D., Staley, J. T., Trigodet, B., Wright, D. J., Leather, S. R., van Emden, H. F. and Poppy, G. M.. 2012. "Effects of organic and conventional fertilizer treatments on host selection by the aphid parasitoid Diaeretiella rapae." Journal of Applied Entomology. 136 (6), pp. 445-455. https://doi.org/10.1111/j.1439-0418.2011.01667.x
Article Title | Effects of organic and conventional fertilizer treatments on host selection by the aphid parasitoid Diaeretiella rapae |
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ERA Journal ID | 2923 |
Article Category | Article |
Authors | Pope, T. W., Girling, R. D., Staley, J. T., Trigodet, B., Wright, D. J., Leather, S. R., van Emden, H. F. and Poppy, G. M. |
Journal Title | Journal of Applied Entomology |
Journal Citation | 136 (6), pp. 445-455 |
Number of Pages | 11 |
Year | 2012 |
Publisher | John Wiley & Sons |
Place of Publication | Germany |
ISSN | 0931-2048 |
1439-0418 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1439-0418.2011.01667.x |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1439-0418.2011.01667.x |
Abstract | The type and quantity of fertilizer supplied to a crop will differ between organic and conventional farming practices. Altering the type of fertilizer a plant is provided with can influence a plant’s foliar nitrogen levels, as well as the composition and concentration of defence compounds, such as glucosinolates. Many natural enemies of insect herbivores can respond to headspace volatiles emitted by the herbivores’ host plant in response to herbivory. We propose that manipulating fertilizer type may also influence the headspace volatile profiles of plants, and as a result, the tritrophic interactions that occur between plants, their insect pests and those pests’ natural enemies. Here, we investigate a tritrophic system consisting of cabbage plants, Brassica oleracea, a parasitoid, Diaeretiella rapae, and one of its hosts, the specialist cabbage aphid Brevicoryne brassicae. Brassica oleracea plants were provided with either no additional fertilization or one of three types of fertilizer: Nitram (ammonium nitrate), John Innes base or organic chicken manure. We investigated whether these changes would alter the rate of parasitism of aphids on those plants and whether any differences in parasitism could be explained by differences in attractivity of the plants to D. rapae or attack rate of aphids by D. rapae. In free-choice experiments, there were significant differences in the percentage of B. brassicae parasitized by D. rapae between B. oleracea plants grown in different fertilizer treatments. In a series of dual-choice Y-tube olfactometry experiments, D. rapae females discriminated between B. brassicae-infested and undamaged plants, but parasitoids did not discriminate between similarly infested plants grown in different fertilizer treatments. Correspondingly, in attack rate experiments, there were no differences in the rate that D. rapae attacked B. brassicae on B. oleracea plants grown in different fertilizer treatments. These findings are of direct relevance to sustainable and conventional farming practices. |
Keywords | parasitism; olfactometer; Brevicoryne brassicae; braconid; cabbage aphid; attack rate |
ANZSRC Field of Research 2020 | 310301. Behavioural ecology |
300804. Horticultural crop protection (incl. pests, diseases and weeds) | |
300801. Field organic and low chemical input horticulture | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Southampton, United Kingdom |
Imperial College London, United Kingdom | |
UK Centre for Ecology & Hydrology, United Kingdom | |
University of Reading, United Kingdom |
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