Common name: Rice black bug
Scientific name: Scotinophara coarctata, S. lurida
Synonyms: Malaysian rice black bug, Japanese rice black bug
Rice and corn
Bangladesh, China, India, Indonesia, Malaysia, Pakistan, Philippines, and Thailand
Both the adults and nymphs suck the plant saps. They prefer to infest the bases of the rice stems causing the plant to weaken. Heavy infestation causes stunted growth, formation of white heads, half-filled or empty grains, and browning of leaves or bug burn.
The eggs are round, greenish or pinkish in color. The eggs are laid in groups of 15 in parallel rows on the lower leaves
near the water surface, on stems, roots and on soil cracks. Egg incubation takes in about 4-7 days.
The nymphs are brown or yellow in color. Black spots are visible on their bodies. Different nymphal instars vary in sizes. Six nymphal instars are completed in 29-35 days.
The adult is white and tinged with green and pink and turns shiny brownish black to shiny black as it matures. It is 8-9 mm long. The adult is very active. It prefers to feed on the rice stem than on the leaves. During the day, the adults are found at the base of the plant and at nighttime they move upwards.