The LepIntercept Dichotomous Keys are written as traditional dichotomous keys with contrasting couplets. The keys are available as PDF files that can be downloaded and/or printed for use without a computer. These keys are for advanced users - please visit the About page for information on using the LepIntercept keys
NOTE: Due to the continuing spread of Helicoverpa armigera in South America, exercise caution when attempting identifications of Helicoverpa from that continent. There are no morphological characters to separate the larvaelarva:
the stages between the egg and pupa of those insects having complete metamorphosis
of H. armigera from H. zea. When in doubt, default to "Helicoverpa sp." instead of attempting a species-level ID. The following keys may not reflect the most recent H. armigera distribution in South America.
Key to frequently named lepidopteran larvae intercepted, or potentially encountered, at U.S. ports
Key to the identification of Helicoverpa armigera suspects intercepted at U.S. ports of entry
Identification guide to larval Heliothinae (Lepidoptera: Noctuidae) of quarantine significance
Morphological guide to known species of Diatraea intercepted at U.S. ports of entry from Mexico
Key to recognizing Spodoptera litura/littoralis intercepted at U.S. ports of entry
Key to larval Tortricidae intercepted, or potentially encountered, at U.S. ports of entry