When fishing for trout focused on willow grubs the angler requires to be relentless, the sixth cast at a fish, which appears no various to the previous lots approximately might produce a fish! The wee red blisters on willow leaves which include the establishing larvae of saw flies which are typically called willow grubs begin to appear early on in the summertime with fish truly typing in on them at the height of the summer season as they drop from the leaves onto the surface area of our willow lined rivers and streams here in New Zealand.