A model to optimise biological control of slugs using nematode parasites

The slug Deroceras reticulatum is a widespread pest of many agricultural and horticultural crops. The slug can be controlled with the commercially available nematode parasite, Phasmarhabditis hermaphrodita. Because the nematode is expensive it is vital to optimise application dose rates and timing....

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Bibliographic Details
Published in:	Applied soil ecology : a section of Agriculture, ecosystems & environment Vol. 26; no. 3; pp. 179 - 191
Main Authors:	Wilson, M.J., Glen, D.M., Hamacher, G.M., Smith, J.U.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-07-2004 Elsevier
Subjects:	Agronomy. Soil science and plant productions animal parasitic nematodes application rate Biological and medical sciences biological control biological control agents Brassica rapa subsp. pekinensis Chemical, physicochemical, biochemical and biological properties Chinese cabbage Deroceras reticulatum Dose–response models Fundamental and applied biological sciences. Psychology mathematical models mollusc control nematode larvae Nematode parasites optimization Phasmarhabditis hermaphrodita Physics, chemistry, biochemistry and biology of agricultural and forest soils plant pests population density population dynamics Rhabditidae slugs Soil science vegetable crops Dose–response models Nematode parasites Phasmarhabditis hermaphrodita Deroceras reticulatum Dose-response models Biological control Ecology Gastropoda Modeling Limacidae Dose activity relation Pulmonata Helmintha Nemathelminthia Soil science Invertebrata Mollusca Nematoda
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Summary:	The slug Deroceras reticulatum is a widespread pest of many agricultural and horticultural crops. The slug can be controlled with the commercially available nematode parasite, Phasmarhabditis hermaphrodita. Because the nematode is expensive it is vital to optimise application dose rates and timing. We used two previously published descriptive models to derive a predictive model that estimates the reduction in slug damage caused by individual nematode doses over time, in relation to slug density. The model was tested in a series of independent mini-plot experiments comprising a wide range of nematode and slug densities and was found to predict reductions in slug damage with a high degree of correlation and no significance of lack of fit over all slug and nematode densities. A key feature of the model application is that nematode rates are based on slug numbers per unit area, rather than unit area alone. The model has much potential to be used in selecting the appropriate nematode application rate and timing to control Deroceras reticulatum damage in a range of crops. The model also highlights the importance of accurate estimates of slug population density together with predictive modelling of slug population dynamics to exploit the full potential of the model for optimising the use of P. hermaphrodita for slug control.
Bibliography:	http://www.sciencedirect.com/science/journal/09291393
ISSN:	0929-1393 1873-0272
DOI:	10.1016/j.apsoil.2004.01.005