Novel approaches for the management of leaf and bud nematodes (Aphelenchoides spp) in hardy nursery stock
Foliar nematodes, also called leaf and bud nematodes (LBN),
Aphelenchoides spp. are microscopic roundworms that live in leaf tissue
and cause significant injury to many ornamental plants. Nematodes in the
genus Aphelenchoides occur commonly throughout the world. In the UK,
Aphelenchoides ritzemabosi and Aphelenchoides fragariae are the two main
foliar nematode species of economic importance. There are over 700
associated host species of LBN from at least 85 different plant families
that include herbaceous, ferns and woody plants. They are economically
important pests in the ornamental industry causing damage on a broad
range of landscape and nursery-grown herbaceous and woody perennials.
Subsequent damage from a LBN infestation can make a plant unmarketable
causing significant economic losses for growers. Furthermore, once
present in a nursery it is a challenging pest to eradicate due to its
transmission being facilitated by overhead irrigation.
Foliar nematodes are becoming more important because of the
revocation and subsequent loss of systemic nematicides, increased
nursery production of these vegetatively propagated plants and long
distance movement of plants. A commonly used method of control now is
Currently the only effective nematicide against this pest in the UK
is Vydate 10G (oxamyl). However, not all growers wish to use oxamyl as
it is not compatible with biological control agents used for other pests
within Integrated Pest Management programmes.
This study aims to develop new approaches for the management of
these nematodes in hardy nursery stock by evaluating individually, and
in combination, products derived from plant extracts, currently approved
pesticides, and ‘elicitors’ of natural defences in plants. The approach
to be undertaken will target three distinct phases of nematodes
infection: movement from soil to plant; movement within plant; and
induction of plant resistance to infection and nematode multiplication
within the plant. The overall objective of this project will be to
develop refined guidelines for the integrated management of foliar
nematodes in hardy nursery stock utilizing existing and novel methods.
The project is funded by the Horticultural Development Company (HDC).
My research interests include integrated pest management with
emphasis on crop pest protection contributing to global food security.
Address: Crop & Soils Systems, Scotland’s Rural College (SRUC), Peter Wilson Building, Kings Buildings, West Mains Road, Edinburgh EH9 3JG.