Trout love craneflies, try fishing in the surface film or with a bead head subsurface, especially June to September and feel that fly line tug!. Hot summers can have a devastating impact on insects like the Daddy Longlegs, killing off the larvae. In turn, this has a negative effect on species that feed on such insect. Hot summers reduce the availability of these flies.
These are often fished on margins or lakes and rivers for trout where the natural is blown by the smallest of winds as it is not a strong flyer. Cast the cranefly close to the margins and twitch it gently as if it was blown onto the water. Alternatively use a beadhead cranefly pattern on a bobber close to the margins to imitate the sunken Cranefly. Be prepared as from May to October you will find these are big meals for trout and tend to get taken aggressively.
About Craneflies - Tipula paludosa
These are part of the (Tipulidae) family, commonly known as daddy-long legs often simply called Daddies. The natural is brown, black or grey in colour, with yellow orange or pale brown markings. The body is long and slender, wings are long and often have dark markings and spots. The head carries long antennae.
A major characteristic of the cranefly is its long legs, these become shed very easily if they are trapped or handled. Adults are often found near water, grass or rank vegetation.