Infested shoots and green cones usually have an amorphous mass of mixed resin and frass at entry holes. Rust infected stems and branches are frequently attacked. The Southern Pine Coneworm is considered the most destructive of the coneworms of the southeastern United States. It ranks among the most serious insect pests of southern pine seed orchards. The Webbing Coneworm, Dioryctria disclusa , shown here in figure 11, has orange to reddish brown wings and is about 27 mm long.
Infested cones have a characteristic mass of tightly webbed frass over the entry hole.
Cones are essentially hollowed out inside. The Webbing Coneworm can cause moderate cone losses but populations seem to be quite variable from area to area and from year to year. The adult has grayish brown wings transversely banded with gray, silver and brown. The infested cone shown here in figure 12 has been bisected and you can see the type of damage done by larval feeding. The genus Barbara is a small but important one.