Millets and Maize | Nezara viridula
Nezara viridula Linnaeus, 1758; Common Name: Green stink bug
Taxonomy Information
Kingdom
Animalia
Phylum
Arthropoda
Class
Insecta
Order
Hemiptera
Superfamily
Pentatomoidea
Family
Pentatomidae
Subfamily
Pentatominae
Genus
Nezara
Species
viridula
Author
Linnaeus, 1758
Field Identification

The adult is shield-shaped with an overall dull green color. The eyes are dark red or black. Small black dots can be found along the sides of the abdomen. The wings completely cover the abdomen. The males average 12.1 mm in length and females 13.15 mm in length. A female green stink bug could lay as many as 260 eggs over her life span. The eggs are white to light yellow in color and barrel shaped with tops that are flat with a disc shaped lid. Newly emerged nymphs are red and stay on the eggs mass for 48 hours or longer. In this time they darken in color to a reddish brown. The immature bugs must shed their skins 5 times before becoming winged adults. At each molt the bug increases in size, growing form 1/16 inch newly emerged to 1/2 inch at the fifth and last nymphal stage. All nymphs are about as broad as long, dark in color, with red and white or yellow markings on their bodies.

Damage

The bugs feed by piercing plant tissue with needle-like stylets. The actual feeding puncture is not immediately visible. Adults and nearly all nymphal stages (2nd to 5th nymphal stages) feed on a variety of plant tissue. Succulent parts of the plant and the developing flowers or fruit are preferred. Feeding injury becomes visible sometime after actual feeding. Feeding on flower buds results in premature abscission. Feeding injury on leguminous pods results in seed damage and ultimately distorted development of the pods.

Key Natural Enemies

Trissolcus basalis, Trichopoda pilipes and Trichopoda pennipes, etc.

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