Deloyala

Deloyala is a genus of tortoise beetles belonging to the subfamily Cassidinae within the family Chrysomelidae. These beetles are characterized by their distinctive flattened, shield-like body shape, which allows them to effectively cover their heads and legs, resembling a turtle shell.

This pest is primarily associated with plants in the family Convolvulaceae. The most notable agricultural impact is observed on sweet potato crops (Ipomoea batatas), although they can also survive and thrive on various wild morning glory species that serve as alternate hosts in agricultural landscapes.

The life cycle of the Deloyala beetle consists of four stages: egg, larva, pupa, and adult. The eggs are typically deposited on the leaves of the host plant. The larvae are easily recognizable by their unique fecal shields, which they carry on their backs as a specialized defense mechanism against predators and environmental stressors such as dehydration.

Damage caused by Deloyala involves the skeletonization of leaves. Both the adult beetles and their larvae feed on the leaf tissue, consuming the parenchyma and leaving behind irregular holes or a skeleton of veins. Heavy infestations lead to significant reduction in the photosynthetic capacity of the plants, ultimately resulting in reduced tuber size and yield.

Integrated pest management (IPM) is essential for controlling this beetle. Key strategies include:

• Strict field hygiene, including the removal of wild Convolvulaceae weeds.
• Crop rotation to reduce the overwintering population density.
• Application of approved insecticides when economic damage thresholds are exceeded.