Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Pathogenic fungi and bacterium intercepted in introduced germplasm during 2004.

Abstract

The quarantine processing of 78 640 samples of exotic planting material (14 242 germplasm and 64 398 trial materials) in 2004 resulted in the interception of a number of economically important fungal pathogens such as: Peronospora manshurica, the causal agent of soyabean downy mildew, not known to occur in India; Puccinia carthami causing safflower rust, which has physiological races; those having a wide host range including Colletotrichum dematium, C. gloeosporioides [Glomerella cingulata], Fusarium solani, Macrophomina phaseolina, Drechslera sorokiniana [Cochliobolus sativus]; species of Alternaria such as A. brassicicola, A. sesami and A. padwickii; and a bacterium (Xanthomonas campestris pv. campestris), causing black rot of crucifers. The economic significance of the intercepted pathogens is discussed and the need to conduct a thorough and critical seed health testing during quarantine processing is emphasized.