Raspberry crown borer symptoms include canes prematurely dying, spindly cane growth, and reduced leaf size. According to BugGuide: “larvae bore inside roots (stock and crown) of blackberry/raspberry … It feeds in the larger roots (crown) or at the base of the raspberry canes. The adult is a very striking moth, resembling a yellow jacket in color, with a wingspan of 1 to 1 1/4 inches and four or more bright yellow bands across the black abdomen. Some of these wilts have been found to be caused by raspberry crown borer, which merits a discussion of this pest in this space. The raspberry crown borer takes two years to complete its life cycle. The larvae are yellowish-white with brown heads and brown on the tip of the thoracic legs. Young larvae feed on the smaller roots, and as they get larger, they move to the crown. Raspberry crown borer has 1 generation per year in Arkansas. The Raspberry crown borer/Blackberry clearwing borer (Pennisetia marginata) is a moth in the Clear-winged moth family Sesiidae (not to be confused with the chunky Hummingbird clear-winged moths, which are in the Sphinx moth bunch). Adult moths are clearwing moths that exhibit yellow and black coloration, similar to a wasp. The adult lays eggs on the leaves, and the larvae crawl to the crown/roots of the plant/cane. Female moths lay up to 140 reddish brown eggs, which are most often found on the underside edges of leaflets in August or September. The raspberry crown borer is called a clearwing moth. If you suspect raspberry crown borer, look for sawdust-like frass pushed out of the base of infested canes near the soil, swelling at the base of the canes, … Larval feeding causes weak, spindly canes that break … We believe it is the Raspberry Crown Borer, Pennisetia marginata, also called the Blackberry Crown Borer since it feeds on both plants. Crown borer is actually simple to diagnose in the field. Adult moths emerge from pupal cases in early September-October, mate in around 7 days, then begin to lay eggs. Eggs are laid on the underside of blackberry leaves, right around the margin. It is a common cane-boring insect pest of raspberry in northern Utah. As with the raspberry cane borer, this insect also requires two years to complete its life cycle. The raspberry crown borer (Pennisetia marginata) is a stout-bodied clear-winged moth that resembles a yellow jacket wasp. It is a common cane-boring insect pest of raspberry in northern Utah. The adult Borer is a moth that looks like a yellow jacket wasp and appears in late summer or early autumn. This is one of the Wasp Mimic Clearwing Moths in the family Sesiidae. The females have yellow legs and rings around their abdomens. We have visited the family before in the form of the squash borer moth and the eupatorium borer moth. 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