The adult Borer is a moth that looks like a yellow jacket wasp and appears in late summer or early autumn. The larvae live and bore into the crown and roots of blackberries, raspberries, loganberries, and wild brambles for two years. The Crown Borer is about 1 inch long, with a white body and brown head. 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 adult lays eggs on the leaves, and the larvae crawl to the crown/roots of the plant/cane. Pennisetia marginata, the raspberry crown borer or blackberry clearwing borer, is a moth of the family Sesiidae.It is widespread in the United States, mainly in the east and along the Pacific Coast, ranging north into the southern parts of Canada.It is an introduced species in Hawaii. Adult moths emerge from pupal cases in early September-October, mate in around 7 days, then begin to lay eggs. Raspberry crown borer symptoms include canes prematurely dying, spindly cane growth, and reduced leaf size. The larvae are yellowish-white with brown heads and brown on the tip of the thoracic legs. This is one of the Wasp Mimic Clearwing Moths in the family Sesiidae. Some of these wilts have been found to be caused by raspberry crown borer, which merits a discussion of this pest in this space. It is a common cane-boring insect pest of raspberry in northern Utah. Raspberry crown borers are black, clear-winged moths. Adult moths are clearwing moths that exhibit yellow and black coloration, similar to a wasp. Young larvae feed on the smaller roots, and as they get larger, they move to the crown. Eggs are laid on the underside of blackberry leaves, right around the margin. The female raspberry crown borer moth lays up to 140 reddish brown eggs most often on the underside edges of caneberry leaflets in late summer. The raspberry crown borer (Pennisetia marginata) is a stout-bodied clear-winged moth that resembles a yellow jacket wasp. 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, … Raspberry crown borer has 1 generation per year in Arkansas. The females have yellow legs and rings around their abdomens. 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). According to BugGuide: “larvae bore inside roots (stock and crown) of blackberry/raspberry … The raspberry crown borer is called a clearwing moth. It is a common cane-boring insect pest of raspberry in northern Utah. We believe it is the Raspberry Crown Borer, Pennisetia marginata, also called the Blackberry Crown Borer since it feeds on both plants. Damage is most evident during the second year of larval activity. As with the raspberry cane borer, this insect also requires two years to complete its life cycle. The raspberry crown borer takes two years to complete its life cycle. Larval feeding causes weak, spindly canes that break … Crown borer is actually simple to diagnose in the field. 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. We have visited the family before in the form of the squash borer moth and the eupatorium borer moth. Raspberry Crown Borer.
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