Canna leafroller

Systematic position: Calpodes ethlius, commonly known as the canna leafroller, belongs to the order Lepidoptera and the family Hesperiidae. It is a moth species notorious for its high specificity to its host plants.

Host plants: The pest primarily targets plants of the genus Canna. It is particularly damaging to cultivated garden cannas, where it can rapidly devastate foliage if left unchecked during the growing season.

Biology and lifecycle: The life cycle consists of egg, larva, pupa, and adult stages. Females lay translucent, dome-shaped eggs on the underside of leaves. Larvae develop through five distinct instars, feeding extensively. Pupation occurs within a specially constructed shelter made of folded leaf edges held together by silk.

Damage and economic impact: Damage is characterized by the rolling of leaf edges into shelters. Larvae emerge from these shelters to feed on the surrounding leaf tissue. Heavy infestations result in significant defoliation, which causes the plant to appear stunted and greatly reduces the aesthetic value of the garden display.

Control measures: Integrated pest management strategies include regular scouting and manual removal of infested leaves. Biological control using Bacillus thuringiensis is highly effective against early instar larvae. For severe infestations, systemic insecticides labeled for ornamental plants should be applied, ensuring thorough coverage of the leaf foliage.