New Zealand Journal of Crop and Horticultural Science abstracts
Abundance of leafrollers and their parasitoids on selected host plants in
New Zealand
D. M. SUCKLING1
G. M. BURNIP1
J. T. S. WALKER2
P. W. SHAW3
G. F. McLAREN4
C. R. HOWARD4
P. LO2
V. WHITE2
J. FRASER4
1The Horticulture and Food Research
Institute of New Zealand Ltd
P. O. Box 51, Lincoln
Canterbury, New Zealand
2 The Horticulture and Food Research
Institute of New Zealand Ltd
P. O. Box 1401
Havelock North, New Zealand
3 The Horticulture and Food Research
Institute of New Zealand Ltd
RD 3, Riwaka
New Zealand
4 The Horticulture and Food Research
Institute of New Zealand Ltd
RD 1, Alexandra
Central Otago, New Zealand
Abstract The comparative abundance of orchard pest leafroller
larvae was determined on eight host plants in the vicinity of pipfruit
orchards. The greatest numbers occurred in Canterbury, followed by Nelson,
Hawke's Bay, and Central Otago. In Hawke's Bay, leafroller larvae were
Ctenopseustis obliquana (41%),
Planotortrix octo (15%),
Epiphyas postvittana (16%), and
Cnephasia jactatana (9%), and
were most abundant on poplar, willow, and alder. In Nelson, leafrollers were
E. postvittana (25%),
Planotortrix excessana (23%),
C.
obliquana (23%), and
C. herana (22%), found on willow, alder,
clover, poplar, gorse, broom, dock, and plantain. In Canterbury, larvae were
C. herana (51%),
E. postvittana (34%), and
P. octo (15%),
mainly on broom, gorse, alder, poplar, dock, and clover. Leafrollers were very
rare on host plants sampled in Central Otago, despite their pest status in
horticulture. A total of 1460 larvae were reared to adults from the four
regions, with 31% parasitism, of which two thirds were
Dolichogenidea
tasmanica (Braconidae). Parasitism varied significantly between leafroller
larval host plants. Removal of leafroller host plants through mowing, pruning,
careful shelter selection or other means could usefully reduce the leafroller
pest density, and risk of incidence on crops.
Keywords leafroller; parasitoid; host plant; tri-trophic
interaction; Tortricidae
H98009
Received 16 February 1998; accepted 11 June 1998
PDF file of entire paper: medium quality (824K); (scanned from paper original: notes about this process)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
