I have a hybrid tee rose and the leaves have tiny holes in them and it seems to be spreading. What can I do and what is causing it? Brian
Rose Bush Disease
Looks like the handywork of either a beetle or caterpillar/slug/worm. If you check underneath the leaves you may find the culprit hiding there. You may not be able to catch them until night time if you check the rosebush with a flashlight as many such pests feed after dark. Spraying the rosebush with a systemic type insecticide or some systemic granules should take care of the problem. If you spray the bush be sure to spray the soils surface too as some pests like to hide just under the soils surface and emerge at night climbing up the bush to feed.