The Navel Orangeworm (Amyelois transitella), is a common pest for almond, pistachio, walnut and fig growers in California. The larvae burrow into the nut kernels and feed, causing widespread losses in quality and yield. The larvae also contaminate the nut kernels with mold-causing fungus. The Navel Orangeworm can have four to five generations per year, causing both early and late season infestations in an orchard. The Navel Orangeworm can be found in the nut growing regions of California and Northern Mexico.