New Zealand Journal of Crop and Horticultural Science abstracts
H00022 Received 20 July 2000; accepted 7 December 2000
Leafroller larval and adult phenology at two Canterbury, New Zealand, organic
apple orchards
G. M. BURNIP
D. M. SUCKLING
The Horticulture and Food Research
Institute of New Zealand Ltd
P. O. Box 51, Lincoln
New Zealand
email: gburnip@hortresearch.co.nz
Abstract Leafroller larval and adult phenology were studied
at two Canterbury, New Zealand, organic apple (
Malus domestica Borkh.)
orchards over three seasons. Larvae were sampled fortnightly from foliage and
then reared to adult for unequivocal species-identification, or emergence of
parasitoids. A total of 3304 larvae were found, comprising
Planotortrix
octo,
Epiphyas postvittana,
Ctenopseustis herana, and the
most abundant larval parasitoid,
Dolichogenidea tasmanica. There was an
almost complete lack of
C. herana larvae from `Royal Gala' in 1993/94
and 1994/95, in contrast with its occurrence on nearby `Red Delicious' in both
seasons (9 and 11%, respectively of the total larvae at this site, cultivar,
and year). Two larval generations per growing season were evident, with
synchrony between the three leafrollers. The over-wintering larval generation
of late instar
P. octo in October/November was followed by an absence of
larvae in late November. Early instar larvae then peaked in late December, with
a second generation of this stage evident in March and April. Eggs were evident
in December and from late February-April. Peak catches of males in pheromone
traps were generally well synchronised with troughs in larval abundance.
Keywords leafroller; apple; phenology; larvae;
Planotortrix octo; Epiphyas postvittana; Ctenopseustis
herana; Dolichogenidea tasmanica
New Zealand Journal of Crop and Horticultural Science, 2001, Vol. 29:
15-22
0014-0671/00/2901-0015 $7.00 (c) The Royal Society of New Zealand 2001
PDF file of entire paper: medium quality (591K); (scanned from paper original: notes about this process)
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