New Zealand Journal of Crop and Horticultural Science abstracts
Phytotoxicity investigations of mineral oil and diazinon sprays applied to
kiwifruit in winter-spring for armoured scale control
R. H. BLANK
M. H. OLSON
The Horticulture and Food Research Institute
of New Zealand
Whangarei Research Centre
Private Bag 9003
Whangarei, New Zealand
A. R. TOMKINS
A. J. GREAVES
The Horticulture and Food Research Institute
of New Zealand
Ruakura Research Centre
Private Bag 3123
Hamilton, New Zealand
J. E. WALLER
New Zealand Pastoral Agriculture Research
Institute Limited
Ruakura Research Centre
Private Bag 3123
Hamilton, New Zealand
W. M. PULFORD
The Horticulture and Food Research Institute
of New Zealand
Riwaka Research Centre
R. D. 3
Motueka, New Zealand
Abstract The effect of 1, 2, or 4% mineral oil (Mobil Superior
663 97%) sprays plus technical grade diazinon (24 g a.i./100 litres) applied to
kiwifruit vines at various times from 35 days before to 25 days after budbreak,
was investigated in orchards at Kerikeri, Te Kauwhata, and Motueka, New
Zealand. There was no significant effect on budbreak, flowers, fruit, and yield
parameters on treated vines compared with unsprayed vines at Te Kauwhata and
Motueka. At Kerikeri the 4% mineral oil-diazinon treatment caused phytotoxic
damage to 25% of canes from an August application, 3% of canes from a September
application, and no damage from an October application after budbreak. Damaged
canes typically had 2-5 terminal buds which were dead. No damage was found at
the 1 and 2% rates. At Kerikeri fruit numbers and yield of the mineral
oil-diazinon treated vines were significantly reduced compared to untreated
vines. After adjusting for differences in cane numbers per vine, yield losses
ranged from 13 to 17% for the 1-4% rates.
Keywords armoured scale; Hemiptera: Diaspididae;
mineral oil; phytotoxicity; yield; dormant season control
PDF file of entire paper: medium quality (596K); (scanned from paper original: notes about this process)
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