Brown Marmorated Stink Bug
Eggs: light colored clusters of about 25 (up to 60 for Brown stinkbug), on end, under leaves. BMS are elliptial. Others are more barrel-shaped.
|Life cycle/Habits||Brown and Green overwinter as adults on weeds, garden debris and under tree bark. BMSB uses sheltered cracks of buildings, rocks, wood piles. Eggs are laid under leaves. Young nymphs aggregate near egg-hatch. Nymphs and adults insert piercing mouthparts and suck plant sap from leaves, fruit, buds or blossoms.
Southern green stink bug feeding can infect beans with disease. Hide when disturbed. Adults are strong flyers and secrete a repellant fluid when threatened or squashed. Also emit aggregating pheremone. Annually, there are 3-4 generations of Southern green stink bug, only one of brown stink bug. BMSB may have up to 2 in Maryland.
|Host Plants||Bean, pepper, tomato, as well as corn, eggplant, okra, pea, soybean, squash, plus most other vegetables and fruits.|
|Signs/Symptoms||Piercing and sucking creates superficial spots (white on young fruit or yellow on mature fruit) known as "cloudy spot" on tomato and other fruits. Pimples or wartlike growths appear on okra and bean pods Blossoms and pods may drop prematurely. Leaves may roll, wilt, or be stunted. Fruit may be deformed. Corn may increase tillering, silk be delayed, and produce reduced as well as damaged. Southern green stinkbug punctures introduce seed pit or yeast spot disease into lima pods, ruining beans.|
|Monitoring||Check leaf undersides for egg masses. Watch young plants, then fruit for damage, especially lima pods as they are rendered inedible. Search carefully for stinkbugs as they purposefully hide. "Healthy" lima beans may reveal cloudy spots when shelled, then grayish blotches when blanched, where bugs introduced yeast disease, Hermatospora coryli, known as seed pit or yeast spot.|