[4][5] Eggs are a yellow-white colour and oblong in shape; the legless larva is a grub, about 3/4 inch in length, with a brown head that usually bears an inverted, Y-shaped mark.

[6] The adult rhubarb curculio overwinters in leaf litter or other similar sites and appears in mid-May.

The adult makes feeding and egg punctures in the crowns, roots, and stalks; a jelly-like sap exudes from the wounds as glistening drops of gum, often with extraneous material trapped within.

[7] Lixus concavus is able to complete its lifecycle in the stalks of curly dock, sunflowers, and thistles; eggs are laid singly in 1⁄8-inch-deep (3.2 mm) cavities, created by feeding activity,[8] and hatch within a week to 10 days.

[7] The adult weevil feeds upon the margins of the leaves besides puncturing the stalks; damage appears as distinct notches in the plant tissues.