New Zealand Journal of Crop and Horticultural Science abstracts
Susceptibility of seedling Pyrus clones to pear sawfly (Caliroa
cerasi) (Hymenoptera: Tenthredinidae) damage
P. W. Shaw1
L. R. Brewer1
D. R. Wallis1
V. G. M. Bus2
P. A. Alspach1
1The Horticulture and Food Research
Institute of New Zealand Ltd
Nelson Research Centre
P.O. Box 220
Motueka, New Zealand
email: palspach@hortresearch.co.nz
2The Horticulture and Food Research
Institute of New Zealand Ltd
Hawke’s Bay Research Centre
Private Bag 1401
Havelock North, New Zealand
Abstract Pear slugs, the larvae of the sawfly Caliroa
cerasi, can cause extensive damage to pear leaves in organic or reduced-spray
orchards. Breeding for resistance provides a strategy for the long-term control
of this pest. Twenty-two accessions from the Horticulture and Food Research
Institute of New Zealand pear breeding programme were selected to cover a
range of field-assessed susceptibility to this pest. These were grafted onto
Pyrus calleryana seedling rootstock, and the young plants were arranged
in a blocked trial design in a ventilated glasshouse. The plants were covered
with insect-proof netting, into which adult sawfly were released. The number
of eggs per plant did not differ among the susceptibility classes, but the
level of damage was related to the predicted level of susceptibility. This
study confirmed the existence of variation in the resistance of pear genotypes
to pear slug damage.
Keywords pear slug; plant resistance; organic growing; plant
damage; oviposition
H02065 Received 2 September 2002; accepted 30 October 2002; published
26 March 2003
New Zealand Journal of Crop and Horticultural Science, 2003, Vol. 31:
9-14
0014-0671/03/3101-0009 $7.00 © The Royal Society of New Zealand
2003
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