Once planted in conducive conditions, they will colonise quickly, doubling in numbers most years to carpet areas and put on a fine show.

Tracking westward, the wave developed convection over its center, and conducive conditions allowed it to develop further.

As it did, it also entered conducive conditions.

Cultural controls include keeping an area free of conducive conditions by removing waste or diseased plants, flooding, sanding, and the use of disease-resistant crop varieties.