Stink Bug (Tetroda denticulifera)

A Slow-Moving Menace in Rice Fields

Among the many insect pests found in rice paddies, the Stink Bug (Tetroda denticulifera, Berg) may not be as common as planthoppers or leafhoppers—but when left uncontrolled, it can cause serious damage by feeding on rice stems and leaves. Its foul odor, emitted from scent glands, has earned it the name "stink bug" in English.

Basic Information

• Common Name: Stink Bug
• Scientific Name: Tetroda denticulifera (Berg)
• Family: Pentatomidae
• Order: Hemiptera

Morphology & Biology

Coloration:

• Males: Dark gray
• Females: Brownish-gray

Distinctive Features:

• Two prong-like projections on the head
• Sharp spines on the first thoracic segment
• Black legs, antennae, and eyes
• Dark gray scutellum
• White wing tips and orange lateral margins

Wings:

• Forewings: Hemelytra (partially hardened)
• Hindwings: Membranous

Behavior:

• Moves slowly
• Often remains stationary
• Emits a strong odor from specialized scent glands

Life Cycle (Incomplete Metamorphosis)

Egg Stage

• Laid in rows on the underside of rice leaves
• 150–200 eggs per female
• Incubation period: ~6–8 days

Nymph Stage

• 5 instars
• Development period: ~60–66 days

Adult Stage

• Lifespan: ~70–125 days
• Capable of continuous reproduction and damage

Host Plants & Feeding Damage

Primary Hosts:

Grasses in the Poaceae family, including:

• Rice
• Barnyard grass
• Wild rice
• Johnson grass

Feeding Damage:

• Feeds by inserting its mouthparts into stems and leaves
• Causes wilting and dehydration of rice plants
• Severe infestations can result in plant death and yield loss

Distribution

Although no official global distribution data is available, Tetroda denticulifera has been frequently observed in rice fields across Thailand and Southeast Asia.

Prevention & Control Methods

While the Stink Bug spreads more slowly than other rice pests, early intervention can help minimize its damage:

✅ Manual Egg Removal

• Inspect the underside of rice leaves
• Collect and destroy egg masses outside the field

✅ Sweep Netting

• Use sweep nets to collect nymphs and adults
• Physically remove them from the field for disposal

Mechanical control methods reduce reliance on chemicals and have less impact on natural enemies.

✅ Conclusion

The Stink Bug (Tetroda denticulifera) is a slow-moving yet destructive pest that can go unnoticed until significant damage occurs. Its long life cycle and ability to feed on vital parts of the rice plant make it a real threat. Early detection of egg clusters and nymphs—paired with prompt physical control—can prevent widespread infestation. Farmers should regularly monitor their fields and apply targeted, eco-friendly control measures to maintain crop health and productivity.