The adults of A. humeralis are diurnal and rather sluggish in motion and may be easily captured on the lower fronds of palms. Eggs are oval and flattened, and are laid in short chains of 2-10 eggs on petioles and young fronds and near the growing tip. Individual eggs slightly overlap each other.
Larval feeding by C. brunnea results in holes in the fronds which are visible when the spear unfolds. Heavy infestations can destroy the youngest fronds and thus retard their growth. The larvae seem to prefer younger plants and no serious new damage has been observed on older plants.
Brontispa longissima affects palm seedlings, mature coconut trees, and ornamental palms; however, palms up to five years old are at the greatest risk of infestation. Adults feed on unopened young fronds; as the spear unfurls, the beetle moves on to other palms or the next emerging spear.
This website offers fact sheets and images for hispine beetle pests of palms.
Quickly and easily browse all the fact sheet images from a single page.
Learn more about the commodity-based resource A Resource for Pests and Diseases of Cultivated Palms.