In this article:
The article provides information on trials in which dormant vines were sprayed with an oil, in most cases a common horticultural summer spray oil of the stock emulsion type embodying a ‘technical white’ oil.
Delayed budburst occurred with all treatments.
It is assumed that any degree of frost protection given by the oil spray is due solely to delayed bud burst and not to any intrinsic front resistance conferred by the oil. Growth of the individual shoots of oil treated vines was markedly delayed during spring, in comparison to untreated vines, however treated vines reach normal appearance by harvest.
High concentrations of oil have reduced yields in some trials, however reductions have not been significant. No other estimate of vine vigor has shown any difference between treatments.
Attempted Frost Protection of Sultana Vines with Petroleum Spray
1943, Journal of the Australian Institute of Agricultural Science, pages 31 – 33
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