Abstract
Abstract In Colombia a bacterial disease of cassava associated with cassava fruitfly (Anastrepha spp.) damage has been observed within the past four years. Etiological studies show that the bacterium is similar to Erwinia carotovora var. carotovora. Following stem damage by Anastrepha spp. larvae the pathogen enters the plant. The symptoms are internal rotting of the stem and wilting of young shoots or branches, followed by tip collapse and dieback or canker formation of lignified stem parts. The etiology is described in detail. The cassava stem rot bacterium (CSRB) is a slender Gram-negative rod with an average size of 2.4 × 1.2 μm. The cells are motile and possess 4–8 peritrichous flagella. In 48 hour-old cultures the cells are single or in chains of 2–3 cells, unencapsulated and non-spore forming. The results of artificial inoculations are given. Biochemical, physiological and cultural characteristics of CSRB are presented. It is concluded that CSRB is a close relative of the E. carotovora group and is...
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