New Zealand Journal of Crop and Horticultural Science abstracts
Mating disruption for the control of leafrollers on apricots
G. F. MCLAREN
J. A. FRASER
Clyde Research Centre
The Horticulture and Food Research
Institute of New Zealand Ltd
RD1, Alexandra
New Zealand
email: gmclaren@hort.cri.nz
D. M. SUCKLING
Canterbury Research Centre
The Horticulture and Food Research
Institute of New Zealand Ltd
P. O. Box 51, Lincoln
New Zealand
Abstract Otago apricots (
Prunus armeniaca L.) are
damaged by the endemic leafrollers,
Planotortrix octo Dugdale and
Ctenopseustis obliquana (Walker), and an Australian species,
Epiphyas postvittana (Walker), all of which are quarantine pests
on export fruit. Mating disruption, using sex pheromones, represents one
promising option for pest management with reduced insecticidal inputs for
apricots. Two pheromone blends were used: one, designed to disrupt the two
endemic species, was (Z)-5-tetradecenyl acetate and (Z)-8-tetradecenyl acetate,
(25:75) and the other, for
E. postvittana,
was
(E)-11-tetradecenyl acetate and (E)-9,(E)-11-tetradecenyl-1 acetate (95:5). No
moths of three leafroller species were caught in pheromone traps at the centre
of 0.1 ha plots of apricot trees treated with polyethylene tubing
dispensers, at 1000/ha, whereas those outside the treated area (70 m
distant) continued to catch. In commercial orchards, dispenser blends prevented
trap catch and reduced damage in apricots on 1-3 orchards per year over 5
years. Dispensers, insecticides, and combinations of the two were equally
effective in preventing damage to the fruit and gave better results than the
untreated. Dispensers were not as effective as an insecticide programme at one
large site over 4 years, except in the centre of the block. Dispensers were
less effective where the tree canopy cover was incomplete and this effect was
more important than the size of the area treated. Apricots were successfully
exported from a 4.8 ha planting that was protected from leafroller damage
by the endemic leafroller pheromone dispensers alone in 1996, and those for
E. postvittana and the endemic leafrollers (two different dispenser
blends) in 1997. Differences between prospects for the use of mating disruption
in summerfruit (stonefruit) and pipfruit (pome fruit) are discussed.
Keywords leafrollers; mating disruption; Planotortrix
octo; Epiphyas postvittana; Ctenopseustis obliquana;
apricots
H97062
Received 8 December 1997; accepted 29 July 1998
PDF file of entire paper: medium quality (775K); (scanned from paper original: notes about this process)
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