Still Time to Apply Horticultural Oil to Trees and Shrubs to Control Overwintering Insects

Torontonians have enjoyed a few glorious spring days but the temperature is dropping again. The mild days will have increased the rate of respiration of overwintering insects, making them more susceptible to smothering treatments. The ideal temperature to apply horticultural oil is between 4C and 12C, exactly the range predicted for the week of April 19th in Toronto.

For more information on the use of horticultural oils, visit the  Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA)  blog here.

Posted in Latest News.