I witnessed similar in the mid 90s in NA. My suspicion was the agricultural industry (or it's associated regulatory bodies) unleashed the swarm. Unfortunately

I witnessed similar in the mid 90s in NA. My suspicion was the agricultural industry (or it's associated regulatory bodies) unleashed the swarm. Unfortunately for my area, they were the non-native variety and since then, native lady bugs are completely wiped out. Haven't seen one in 2 decades.