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The modelling of the key parameters to measure the potential of a parasitoid to control the aphid Nasonovia ribisnigri - HH3119TPC

Glasshouse lettuce is a high value crop that has the conflicting requirements of low or no pesticide residues and no pests (live or dead) on the final product. These requirements, coupled with the reduction in the number of registered pesticides available for use, indicate that this crop is a prime candidate for a comprehensive IPM programme that relies heavily on biocontrol agents (BCAs). Of the four aphid species that are a pest on glasshouse lettuce, Nasonovia ribisnigri is currently without a commercially available BCA. Therefore, growers struggle to implement IPM programmes due to the periodic need to use insecticides for control of this aphid, thus resulting in an ongoing heavy reliance on pesticides. This project will investigate the potential of an aphid parasitoid as a primary BCA for Nasonovia ribisnigri. Experiments in controlled environments will provide the parameters for models describing the population dynamics of the parasitoid and its host. These will then be combined into a model simulating the interactions of these species in glasshouse conditions. This model will be used to investigate the potential of the parasitoid to control Nasonovia ribisnigri under a range of different circumstances applicable to the glasshouse industry. Different management strategies will also be tested via the model to highlight possible methods of maximising the efficacy of the BCA. The results of this project will enable the industry to decide whether this parasitoid is capable of becoming the final part of a comprehensive IPM programme against aphids in glasshouse lettuce. It supports DEFRA’s policy of moving towards a more sustainable horticultural industry.
To determine the potential for using a parasitoid as an effective control agent for N. ribisnigri within a wider IPM system for the management of aphids attacking glasshouse lettuce crops by:1. Establishing and generating the biological data required to determine the ability of a parasitoid to successfully control N. ribisnigri. 2. Establishing and generating the biological data to parameterise and develop a population dynamics model for N. ribisnigri.3. Developing a simulation model of the population development and interactions of N. ribisnigri and the parasitoid and running simulations to ascertain the potential of the parasitoid as a BCA of N. ribisnigri.
Project Documents
• Final Report : The modelling of the key parameters to measure the potential of a parasitoid to control the aphid Nasonovia ribisnigri   (7699k)
Time-Scale and Cost
From: 2003

To: 2005

Cost: £79,266
Contractor / Funded Organisations
Stockbridge Technology Centre
Biological Control              
Organic Farming              
Pest Control              
Protected Cropping              
Sustainable Farming and Food              
Sustainable Production              
Fields of Study