One factor is that researchers have found warmer temperatures increase the number of young produced by
the gloomy scale insect — a significant tree pest — by 300 percent, which in turn leads to 200 times more adult gloomy scales on urban trees.
«We'd been seeing higher numbers of plant - eating
insects like the
gloomy scale in cities, and now we know why,» says Adam Dale, a Ph.D. student at NC State and lead author of two papers describing the work.