Yellow Scale on Daphne Leaves

Question

I have sprayed with white oil to no affect. Could you please make a suggestion? The scale is yellow and quite flat. It appears on the back of the leaf but shows through to the front by way of a small yellow blotch.

Answer 1

Give the insecticide some time to work. You may also want to look into using neem oil, which is very effective on this pest as well. These articles will help:
https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Also, scale tends to attack plants that have something else weakening them. Apply some fertilizer to the plant and make sure it is getting enough water.