Asian lady beetles (often called Asian beetles) are not always orange. They come in several colors—yellow, orange, red, even nearly brown—and their spots and patterns can vary greatly.

 

Color Varieties of Asian Beetles

 

Asian lady beetles have a wide range of colors and spot patterns:

• Background color: Can be pale yellow, bright orange, deep red or brownish.
• Spot number: Ranges from zero up to 20 spots or more; sometimes spots merge into blotches.
• Melanistic forms: Some are almost entirely black with red spots or no spots at all.

 

Why They Vary in Color

 

Color differences depend on age, genetics and temperature during development:

• Younger beetles may look paler and gain brighter colors as they mature.
• Genetic variations among different populations lead to distinct spot patterns.
• Cooler temperatures during the pupal stage often produce darker, more intense hues.

 

How to Identify Asian Lady Beetles

 

Key traits that set these beetles apart include:

• Pronotum marking: A distinctive “M” or “W” shaped black mark on a white or pale background right behind the head.
• Oval, domed shape: Similar to other ladybugs but slightly larger (about 1/4 inch long).
• Behavior: They cluster indoors in large numbers during fall seeking warmth.

 

Why They Matter in Your Home and Garden

 

These beetles can be both helpful and a nuisance:

• Garden allies: They eat aphids, scale insects and other soft‐bodied pests.
• Indoor invaders: In late fall, they gather in wall voids or attics. When disturbed, they release a yellowish odor and can leave stains.

 

Managing Asian Beetles

 

To reduce unwanted indoor gatherings, homeowners in Nashua and elsewhere can:

• Seal cracks and gaps around windows, doors and foundations.
• Use light traps or vacuum infestations gently and release outdoors.
• Keep outdoor lighting to a minimum to avoid attracting them at night.

By understanding their color variations and habits, you can correctly identify Asian lady beetles and take steps to enjoy their garden benefits while minimizing indoor invasions.