Harlequin Bug

Murgantia histrionica
Also known as Calico Bugs

Harlequin bug
Harlequin bug [Credit: James Castner]
Harlequin bug [Credit: James Castner]
Harlequin bug eggs and nymphs
Harlequin bug eggs and nymphs [Credit: Lyle Buss]
Harlequin bug eggs and nymphs [Credit: Lyle Buss]
Harlequin bug
Harlequin bug [Credit: Lostinfog ]
Harlequin bug [Credit: Lostinfog ]
Harlequin bug nymph
Harlequin bug nymph [Credit: James Castner]
Harlequin bug nymph [Credit: James Castner]
Harlequin bug eggs
Harlequin bug eggs [Credit: James Castner]
Harlequin bug eggs [Credit: James Castner]


Host Plants:

On Crops: Broccoli, cabbage, kale, and occasionally other vegetables.

Where Found:

North America

Description:

Brightly marked black-and-orange shield bugs found on cabbage family crops in summer are usually harlequin bugs. Young harlequin bugs are often black and yellow. They tend to congregate and mate on summer kale or collards. About one-third inch long, harlequin cabbage bugs are sometimes called calico bugs. They have black legs and short, segmented antennae.

Damage:

Harlequin bugs suck plant juices, robbing them of moisture and leaving behind feeding wounds. Overwintering as adults, harlequin bugs may be active year round win very warm climates.

Preventing Problems:

The flower called cleome can be used as a trap crop for harlequin bugs; they are also drawn to mustards.

Managing Outbreaks:

Hand pick as many as you can, and use spinosad (a biological pesticide) if problems are severe. Scout for lines of barrel-shaped eggs attached to leaf undersides and destroy them.

Tips:

In warm climates, grow early brassicas and harvest them promptly, before harlequin bugs become numerous. Use row covers to protect seedlings planted in summer for fall harvest.

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