Lepidoptera, Geometridae, Arctiidae, Agrotidae, and Pyralidae of Guam Author Swezey, O. H. Experiment Station Hawaiian Sugar Planters' Association, Honolulu text 1946 1942-12-20 Bernice P. Bishop Museum Bulletin 189 Honolulu, Hawaii Insects of Guam II 163 185 book chapter http://doi.org/10.5281/zenodo.5165313 058b438a-ffe3-452b-a286-9267419b3014 5165313 22. Marasmia trapezalis (Guenee) . Salbia trapezalis Guenee , ., Lep. 8 : 200 , 1854 . Marasmia trapezaUs, Hampson , Fauna Brit. India , Moths 4 : 277 , 1896 ; Tams , 3 ( 4 ): 276 , 1935 . Dededo, May 11; Mt. Alifan, May 26; Barrigada, June 24; Piti, July 31, all reared from corn by Swezey. Four specimens in U. S. National Museum, Fullaway, 1911 . This corn leafroller is distributed around the world in the tropics. It occurs in many Pacific islands, but not in Hawaii. It was recorded in Guam by Fullaway in 1911. We found young corn plants commonly attacked by the larvae of this moth everywhere in Guam . They roll the tip of the leaf for a hiding place or protection while feeding within. If growing conditions, are favorable the plant is not much checked, especially as the plant becomes older. Some are parasitized by a braconid, Apanteles guamensis Fullaway.