Retracrus johnstoni Keifer, 1965

Type host: Chamaedorea sp.

Type locality: Mexico intercepted at USA (San Antonio, Texas)

Other host: Astrocaryum aculeatissimum (Schott) Burret; Bactris gasipaes Kunth; Bactris setosa Mart. (this publication); Chamaedorea costaricana Oerst. (Ochoa et al. 1994); Chamaedorea elegans Mart. (Schliesske 1988); Cocos nucifera L. (Santana et al. 1994); Elaeis guineensis Jacquin; Euterpe edulis Mart.; Euterpe oleracea Mart.; Euterpe precatoria Mart.; Euterpe sp.; Geonoma gamiovora Barb. Rodr.; Geonoma pohliana Mart.; Geonoma schottiana Mart.; Mauritia flexuosa L.; Scheelea sp. (this publication); and Syagrus romanzoffiana (Cham.) Glassm. (Santana & Flechtmann 1998)

Other locality: Brazil (Amazonas, Sergipe, São Paulo) (Santana et al. 1994; this publication); Costa Rica (Schliesske 1988)

Plant part: upper leaf surface

Remarks: type species of the genus (Amrine Jr. & de Lillo 2003). Found in dense colonies, causing spots that are dark when observing the lower surface, but yellowish when observing the upper surface.