Narrow distribution. In parts of Oceania. On sweetpotato, kangkong, and other Ipomoea species.
Eggs on underside of leaves, grubs feed on roots, and after pupation, adults (6 mm) emerge. If many, swarms may occur.
Holes made in the leaves as the beetles feed. Young plants slow to grow, but effect on yield unknown. •
Cultural control: do not plant new crops next to old infested ones; apply mulches, manures, fertilizer, water for rapid early growth; handpick early in day; collect and burn trash after harvest.
Chemical control: PDPs: ash (or ash+lime in water), derris, pyrethrum, or chilli; or synthetic pyrethroids.