Geshna

Geshna
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Crambidae
Genus:	Geshna Dyar, 1906
Species:	G. cannalis
Binomial name
Geshna cannalis (Quaintance, 1898)
Synonyms
Hydrocampa cannalis Quaintance, 1898 Nymphula camalis Klima, 1937

Geshna is a genus of moths of the Crambidae family. It contains only one species, Geshna cannalis, the lesser canna leafroller, which is found in North America, where it has been recorded from Florida, Mississippi, South Carolina, North Carolina and Tennessee. It has also been recorded from Costa Rica and Cuba.

The wingspan is 20-25 mm. Adults are light brown with two brownish black lines across the fore- and hindwings, as well as a small angular white patch near the distal portion of the discal cell on the forewings. Adults are on wing from February to May, from July to August and from November to December.

The larvae feed on Canna species. Young larvae mine the leaves of their host plant, creating a mine between the upper and lower epidermis. The mine is filled with frass. Young larvae reach a length of about 1.4 mm. They have a yellowish, somewhat transparent body and a yellow head. Older larvae feed gregariously on the upper leaf surface and later roll a leaf of their host plant. Up to six larvae may live within a single leaf roll. Last instar larvae reach a length of about 23 mm. They are yellowish white with a yellow head. Pupation takes place in a silken shelter within the leaf roll.