Lilacs and horticultaral oil


I have a infestation of scale on my lilacs and I understand that now is the time to spray them with horticultural oil. I have Gordon's Dormant Oil Spray that is 97% petroleum oil but I have lost the directions. How much should I use per gallon of water?

Also what other measures should I adopt to control the infesation especiallya fter they bud out and the leaves are on?

Thanks,
Bob

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