New Zealand Journal of Crop and Horticultural Science abstracts
Large-scale trials of mating disruption of lightbrown apple moth
in Nelson, New Zealand
D. M. SUCKLING
The Horticulture and Food Research
Institute of New Zealand
Canterbury Research Centre
P.O. Box 51
Lincoln, New Zealand
P. W. SHAW
The Horticulture and Food Research
Institute of New Zealand
Appleby Research Orchard
Nelson, New Zealand
Abstract Mating disruption of lightbrown apple moth
(
Epiphyas postvittana (Walker))was assessed in combination with reduced
insecticide programmes covering 321 ha of trials in commercial Nelson apple
(
Malus domestica Borkh.) orchards from 1990/91 to 1993/94. The aim was
to compare insect control and insecticide residues under a combination of
reduced insecticide plus pheromone, compared to the standard insecticide
programme alone, on a commercial scale. The combination of the pheromone and
two fewer spray applications post-Christmas, including the omission of the
final application 2 weeks before harvest, provided an equivalent level of
leafroller control to the standard insecticide programme in 3 of the 4 years.
Reduced insecticide use in the absence of pheromone had increased fruit damage.
Individual sites where poor control was obtained with pheromone were
characterised by a small treated area or poor application technique, indicated
by trap catch inside the treated area. High rate pheromone (2000
dispensers/ha), yielded significantly less fruit damage at harvest than the
standard pheromone rate (1000/ha). Azinphos-methyl residues were reduced on
fruit at harvest in the pheromone treatments, and the incidence of fruit with
low or non-detectable residues was increased. Prospects for managing
leafrollers using pheromones in combination with reduced insecticide programmes
are promising, although further work is needed to make this alternative more
cost-effective.
Keywords pheromone; apple; Malus domestica; insect;
lightbrown apple moth; Epiphyas postvittana; mating disruption;
sustainability; residue
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
127-137
0114-0671/95/2302--0127 $2.50/0 (c) The Royal Society of New Zealand
1995
PDF file of entire paper: medium quality (902K); (scanned from paper original: notes about this process)
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