Australian Cockroach (Periplaneta australasiae)

How to Identify Them

It resembles a smaller American cockroach, but the giveaway is the pale yellow stripe on the outer edge of each wing near the base. The pronotum has a bold yellow margin around a dark center. Nymphs are darker with yellowish spots on the body.

Common look-alikes:

• American cockroach: larger, without the yellow wing stripes.
• Smokybrown cockroach: solid dark mahogany with no markings.

Signs of an Infestation

• Roaches with yellow wing markings near plants, lanais or sliding doors
• Chewed tender leaves on potted or indoor plants
• Activity around houseplants that spent time outdoors
• Droppings and egg cases in pots, planters and garages

Prevention Tips

• Inspect potted plants before bringing them inside.
• Remove dead leaves and debris from planters.
• Keep mulch thin and away from the foundation.
• Seal gaps around doors, windows and screens.
• Store bags of potting soil and mulch away from the house.

Australian Cockroaches Around Lanais and Pool Cages

Screened lanais and pool enclosures are a favorite setting for this species in South Florida. Rows of potted palms, orchids and herbs give them shade, moisture and a steady supply of decaying leaves. Outdoor kitchens and covered patios add crumbs and grease. Because the screen enclosure keeps out some of their natural predators, like lizards and birds, numbers can build up quietly until roaches start slipping through the sliding door.

If you keep plants on a lanai, move pots now and then, sweep up fallen leaves, and avoid overwatering so the soil surface can dry between waterings. Raising pots on stands or feet lets air move underneath and leaves fewer dark, damp hiding spots. When you bring a plant inside for the season or after a storm, check the saucer, the drainage holes and the top layer of soil first.