Intimidating looking but relatively harmless arachnids native to east Asia spread across US north-eastThe invasive joro spider has been spotted for the first time in Pennsylvania.Six of the giant, colorful spiders, which were already spreading across north-east states including New York and New Jersey, were seen in the yard of a home in Buck county on 5 September, according to the interactive tracking system JoroWatch. A state entomologist then visited to confirm the location and identification. Continue reading...