A female Watermelon Bug (Coridius chinensis) lays eggs in clustered rows on the wax gourd or ash gourd (Benincasa hispida) vines in a locality at Tehatta, West Bengal, India, on June 05, 2026. The Watermelon Bug is a shield-backed true bug native to Asia and Africa. It is an invasive and detrimental agricultural pest that primarily feeds on the sap of cucurbit crops. It is a pest that primarily targets the Cucurbitaceae family, such as gourds and watermelon crops, in regions like South Asia and the Middle East. Females lay dark brown to reddish-brown eggs in masses on the lower surface of leaves or in long rows along leaf veins and stems. These eggs hatch into small, drum-shaped, cylindrical pale brown to reddish-black nymphs within 7 to 8 days. Both newly hatched nymphs and adults cluster on host plants, feeding on sap and potentially stunting growth.
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