Variation in the Pathogenicity of Eutypa lata (= E. armeniacae)

Abstract

Evidence is advanced for the existence of pathotypes in Eutypa lata. Two groups of pathotypes, respectively of high and low virulence to apricot, were identified on the basis of the uniform patterns of response obtained following the inoculation of single ascospore isolates to four cultivars of apricot in widely separated geographical regions.These pathotypes exhibited similar patterns of virulence to almond, in which there was some evidence for differences in the susceptibility of cultivars.Of the six isolates inoculated to pear, only one was pathogenic. The grapevine is believed to be a universal host, susceptible to a wide range of pathotypes of which only a few are capable of pathogenesis in hosts in which the pathogen is found infrequently.

Draft Genome Sequence of the Grapevine Dieback Fungus Eutypa lata UCR-EL1

“…(also known as E. armeniacae Hansf. and M. V. Carter) (1, 2). E. lata infections result in significant economical losses due to reduced yields, increased crop management costs, and shortened life span of the vines (3, 4).…”

“…E. lata enters the host through pruning wounds, colonizes the vascular tissues (1, 5), and gradually kills the plant by secreting phytotoxins (6, 7) and cell wall-degrading enzymes (8). Grape cultivars show differences in their susceptibilities to E. lata (9), but no resistant cultivars or completely effective management practices are available.…”

Population genomics of the grapevine pathogen Eutypa lata reveals evidence for population expansion and intraspecific differences in secondary metabolite gene clusters

“…E . lata is considered a generalist fungus, regularly reported in continents where grapevines and specific Prunus species are cultivated, including Europe, North America, Australia, and South Africa [ 16 ]. Microsatellite based investigations of the genetic diversity of the E .…”

A rapid method to assess the aggressiveness of Eutypa lata isolates and the susceptibility of grapevine cultivars to Eutypa dieback

“…The effect of the inoculum position was marked 5 weeks after inoculation. (Petzolt et al, 1981;Mur, 1988) (Ramos et al, 1975;Carter et al, 1985;Rumbos, 1987) or in biossays for grapevine (Mauro et al, 1988 …”