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Amos Nomore · 18-10-2008, 03:17 AM posted to rec.gardens

In article ,
wrote:

Have 16 oz container of Dragon Horticultural spray oil that says dormant &
growing season spray...the directions are missing...just wonder if this need
to be diluted or not.....active ingredient petroleum oil 98%....thanks

A 2% dilution is typical for petroleum based horticultural oils, so
about 5 tablespoons per gallon of water, or 4 teaspoons per quart.. Add
a small squirt of dishwashing liquid to help the oil emulsify. It is a
good idea to test delicate plants by spraying a few leaves and checking
in a day or two for adverse reactions.