This pattern works well to imitate pale wateries, spurwings and pale coloured olives. Mostly useful in April, May, June and July. It will take trout feeding on the above mentioned flies that are emerging or are returning to the water to lay their eggs.
The Large Dark Olive (L.D.O.) is one of the first flies to hatch on the river in spring. Often you can get L.D.O.s hatching on the opening day of the new season if the weather is mild enough. Other times it can be as late as April before they start hatching. Weather conditions will dictate when they start hatching. It is the most important fly for the dry fly angler for the months of March and April and again in September. A must have fly for any dry fly angler in Ireland or the UK.
A good olive imitation for when olives are emerging or struggling in or just below the surface film. It’s also a great choice for prospecting for trout with spiders.