The dusky birch sawfly (Croesus latitarsus) is one of several species that target birch trees. Though they are harmless to humans, these insects can be a nuisance for gardeners and arborists, as they cause noticeable damage to their host plants.

2024年6月5日 · If you notice defoliation in river birch trees, this may be a sign that dusky birch sawflies (Croesus latitarsus) are feeding on the foliage. Examine the leaf edges for these voracious feeders, which resemble caterpillars (immature moths and butterflies in the order Lepidoptera) but are actually sawflies, in the bee, ant and wasp insect order ...

The Birch Leafminer (Fenusa pusilla) is a small sawfly that is a common pest of birch trees. As the name suggests, the larvae of this insect mine the leaves of birch trees, leading to aesthetic damage that can detract from the tree’s appeal.

As its name suggests, the dusky birch sawfly feeds primarily on birch trees, most commonly river birch in North Carolina landscapes. It is found throughout the United States and has two generations per year in NC. Right now they are in the larval stage of their second generation.

Foliage of birches, primarily gray birch, but also black, yellow, and paper birches is consumed. Small trees may be defoliated by these caterpillars that feed in groups, particularly around leaf margins. Look for leaves eaten from the edge working inward. Search the margins of those leaves for sawfly caterpillars.

2021年8月25日 · That s-shaped position they show in your photos are a dead giveaway of sawfly larvae, which do so when disturbed. They are likely "dusky birch sawfly," as they are feeding on your river birch trees. A light infestation can be manually removed, especially since they tend to hatch out and feed together.

2015年7月10日 · The dusky birch sawfly is an occasional pest of birch trees, particularly river birch. Sawflies are stingless wasps whose larvae are plant feeders.

2015年7月7日 · Symptoms: Dusky birch sawfly have two generations per year and can start out very small, almost too small to see. The first generation larvae feed from May to early July. The second, overlapping generation feeds though September. They begin by gradually skeletonizing the leaves, as the early larvae will not eat the veins.

Biorational insecticides: Insecticidal soap-best for low populations of young larvae. A note here - Bacillus thuringiensis (BT) will not control sawflies. Strains of this biological insecticide are effective against various caterpillar pests (larvae of butterflies and …

Both sawfly larvae and caterpillars have three pairs of thoracic legs, but caterpillars have two to five pairs of prolegs (fleshy, leg-like projections) on their abdomens while sawflies have six or more.