Unfertilized eggs develop as male, fertilized eggs develop into females, see Arrhenotoky.The lifespan of an individual sawfly is two months to two years, though the adult life stage is often very short (approximately 7 – 9 days), only long enough for the females to lay their eggs.Class: Insecta. The Willow sawfly, for example, defoliates willows, while several kinds of pine sawflies focus their feeding on pines. The table below lists some of the more common North American sawflies that might present problems in the garden or landscape, and their host plants.
Adult female sawfly. Adult sawflies are small, stout-bodied, non-stinging wasp-like insects. They are rarely seen in the landscape. Their name comes from the saw-like egg-laying structure of adult females. Difference between sawfly larvae and butterfly and moth caterpillars. Sawfly larvae are more commonly seen than adult flies. Apr 21, 2017 · Sawflies are a group insects related to wasps that get their common name from the saw-like appearance of the ovipositor, which females use to cut slits in stems or leaves to lay their eggs. The plant-feeding larvae often look like caterpillars or slugs, and many are quite noticeable because they often stay together to feed in groups and quickly cause noticeable defoliation on their hosts.
Other sawfly larvae resemble slugs, with a slimy non-segmented body. This group of sawfly larvae usually feeds only on the leaf surface, leaving a skeleton of leaf veins where they feed. Sawfly Life Cycle. Adult sawflies lay eggs in or on leaves. The larvae hatch out in late spring or early summer and begin feeding. They spin cocoons when fully. Sightings of adult sawflies are rare, but you may occasionally see them near flowers and flower buds where their offspring cause damage to the foliage. Read here for more sawfly information.Author: Jackie Carroll.
Overwintering eggs that have been deposited in the needles can be easily located after a heavy frost turns the egg-laying scar yellow. (See "Pine Sawfly – Species" for a detailed description of larvae.) Life Cycle - European Pine Sawfly. In August to September, the adult European pine sawflies emerge from their cocoons to mate and lay eggs. European Pine Sawfly. European pine sawfly larvae are gray-green with black heads, there is a dark gray stripe along each side of the body (see a short video of the larvae here). They can feed on many pines including Scotch, Eastern white, and Austrian. The insect .