A new species of the genus Ferrisia (Hemiptera: Coccomorpha: Pseudococcidae) from southern Vietnam

Abstract: In this paper, a new species, Ferrisia san Tanaka, sp. nov. (Hemiptera: Sternorrhyncha: Coccomorpha: Pseudococcidae), is described and illustrated based on the morphology of adult female specimens collected on cassava, Manihot esculenta (Euphorbiaceae), from Ho Chi Minh City and Dong Nai province in southern Vietnam. This is the second species of Ferrisia Fullaway, 1923, a genus native to the Americas, to be found in Vietnam. The adult female of this new species has a combination of morphological features distinct from those of named species of Ferrisia: the small type of the ventral oral-collar tubular ducts is present anterior to the multilocular disc pore rows as well as on the ventral submarginal area, but never forms marginal clusters; the large type of the ventral oral-collar ducts is confined to the posterior abdomen; and the dorsal enlarged tubular ducts are sometimes associated with one or two discoidal pores, which are mostly on the outermost edges of the sclerotized area of the ducts. An updated key to species of Ferrisia is provided, and the potential risks of this new species for the cultivation of cassava in Vietnam, and its implications for international quarantine are discussed.

Key words: Hemiptera, Sternorrhyncha, Pseudococcidae, mealybug, alien species, cassava, international pest quarantine, Manihot esculenta, pest, taxonomy, Southeast Asia, Oriental Region