Subject: strange black white yellow caterpillars are invading my yard
Location: south eastern Arizona
August 31, 2014 10:11 pm
This is the second year my yard has literally been taken over by hundreds of caterpillars so many that when you step out side onto my porch it sounds like it’s raining due to the unbelievable amount of caterpillars.normally I wouldn’t worry but within the last two years I’ve been trying to find our exactly what kind of caterpillar thus is and if they are harmful in any way please help!
This is a Davis’ Tussock Moth Caterpillar, Halysidota davisii, which we matched to an image on BugGuide. According to BugGuide, the range is: “Utah, Arizona, New Mexico and northwestern Texas,” but there is no information regarding periodic outbreaks of large populations, though that is an occurence that is frequent with other species of Tussock Moths.