Occurrence and variability of Colletotrichum truncatum on soybean in Zambia

Abstract

Samples of soybean leaflets showing leaf spot disease symptoms were collected from farms in Central, Lusaka and Southern provinces of Zambia. The pathogen was identified as Colletotrichum truncatum. Isolations were purified using single conidia and compared for morphological and physiological characters as well as for their pathogenic reactions to three commonly grown soybean cultivars in Zambia.

Phylogeny and variability ofColletotrichum truncatumassociated with soybean anthracnose in Brazil

“…These results suggest that the genetic variation observed among the C. truncatum isolates is not linked to pathogenic variation, probably because the genomic regions analysed do not play an important role in the ability to cause diseases. Variations in the aggressiveness among isolates of C. truncatum have been described in Zambia by Mayonjo and Kapooria (2003), who demonstrated significant differences in the isolates' ability to cause diseases in distinct soybean cultivars, suggesting differences in both the aggressiveness of isolates and in cultivar reaction.…”

Diseases of Edible Oilseed Crops

“…It is generally more abundant in subtropical or tropical than temperate zones. It is reported to be the serious dis ease in Argentina (Daniel Ploper et al 2001, Ramos et al 2010, Austria (Zwatz et al 2000), Brazil (Klingelfuss and Yorinori 2001), China (Feng et al 2012a), India (Jagtap et al 2012b), and Zambia (Mayonjo and Kapooria 2003). During the last decade, soybean yield losses have increased as the disease is associated with monocropping, no-till systems, and genetic uniformity of cultivars in the northern Pampeana region of Argentina (Ramos et al 2010).…”

Geographical distribution, diversity and pathogenicity of Colletotrichum associ-ated with soybean anthracnose in Brazil

“…This pattern was also reported by Hartman et al (2015). Usually, Colletotrichum truncatum produce whitish colonies that eventually turn smoky black and, for that reason, isolates of C. truncatum greatly vary the colony characteristics and pathogenicity (Torres-Calzada et al, 2017;Majonjo & Kapooria, 2003).…”