moderately resistant as the standard check (cv. 7440)
with respective severity levels of 33.6 and 35.7% (Table
3). Among the pathogen isolates, the most aggressive
strain was ‘H11’ from Harenna forest coffee site in the
southeast by causing significantly (P < 0.05) severe
seedling death of 78.7%; followed by Bonga ‘B23’ and
Yayu ‘Y21’ isolates collected in southwest forest coffee
sites of Ethiopia. They were as aggressive as the strain
isolated from plantation coffee at Gera ‘G11’ while
Berhane-Kontir isolate ‘SH21’ was the least aggressive
pathogen with 20.8% seedling death (Table 3).
The accession versus isolate interactions demonstrated
differential effects, and thus, seedlings of Harenna
accessions (P4, P6 and P11) were horizontally resistant
(< 30%) to almost all isolates of G. xylarioides but
susceptible to the isolate originated from the same site
(H11) which induced 90% seedling death. In contrast,
Yayu accessions (P47, P49 and P59) were highly
resistant only to Berhane-Kontir isolate (SH21) without
expressing any wilt symptoms (0.0%); although, they are
susceptible to the other four isolates, namely, ‘B23’,
‘Y21’, ‘H11’ and ‘G11’ with varying disease levels (Table
3). With respect to the differential effect of the pathogen
isolates, the Harenna isolate (H11) induced higher death
rates (up to 90%) on all accessions including the
moderately resistant check ‘cv. 7440’ being horizontally
pathogenic strain. On the other hand, the Berhane-Kontir
isolate ‘SH21’ was not or weakly pathogenic to the
moderately resistant as the standard check (cv. 7440)
with respective severity levels of 33.6 and 35.7% (Table
3). Among the pathogen isolates, the most aggressive
strain was ‘H11’ from Harenna forest coffee site in the
southeast by causing significantly (P < 0.05) severe
seedling death of 78.7%; followed by Bonga ‘B23’ and
Yayu ‘Y21’ isolates collected in southwest forest coffee
sites of Ethiopia. They were as aggressive as the strain
isolated from plantation coffee at Gera ‘G11’ while
Berhane-Kontir isolate ‘SH21’ was the least aggressive
pathogen with 20.8% seedling death (Table 3).
The accession versus isolate interactions demonstrated
differential effects, and thus, seedlings of Harenna
accessions (P4, P6 and P11) were horizontally resistant
(< 30%) to almost all isolates of G. xylarioides but
susceptible to the isolate originated from the same site
(H11) which induced 90% seedling death. In contrast,
Yayu accessions (P47, P49 and P59) were highly
resistant only to Berhane-Kontir isolate (SH21) without
expressing any wilt symptoms (0.0%); although, they are
susceptible to the other four isolates, namely, ‘B23’,
‘Y21’, ‘H11’ and ‘G11’ with varying disease levels (Table
3). With respect to the differential effect of the pathogen
isolates, the Harenna isolate (H11) induced higher death
rates (up to 90%) on all accessions including the
moderately resistant check ‘cv. 7440’ being horizontally
pathogenic strain. On the other hand, the Berhane-Kontir
isolate ‘SH21’ was not or weakly pathogenic to the
การแปล กรุณารอสักครู่..
