Alfalfa leafcutting bee-Clerid beetle

Trichodes ornatus

Pest description and damage The ornate checkered beetle is about 0.3 to 0.5 inch long and usually has a checkered black and yellow or red patterning. The first instar attaches onto adult bees visiting flowers and hitches a ride to the bee nest. Beetle larvae attack bee eggs, consume pollen provisions, and causes damage to cells as it tunnels through bee nest.


Infestations are associated with high concentrations are weeds surrounding bee nests. Clearing weeds from nest areas decrease the probability of beetle larvae infestations, although beetle infestations are typically no longer a major concern.