Yield efficiency according to tree canopy volume was calculated. 3 yr after planting. This isolate was more severe than isolate GFSS 1 where only three out of five inoculated plants died over the same period. With the mild isolates, the first deaths occurred 4 yr after planting. Trees that died from infection with the two severe isolates and LMS 6, as well as the one control plant, exhibited declining symptoms for more than a year before death, whereas those inoculated with isolates T30, T33, T54, T55 and Micveh T 127000 displayed typical quick decline symptoms.
Numbers are cumulative totals.
Y yield for last crop Data representing tree ratings with the different treatments are presented in table 3. Tree condition and performance of all the trees inoculated with the mild isolates were better than the control trees, indicating that all the mild isolates gave some protection. Trees with the Micveh T isolate were highly productive, but fruit size was small. The decrease in fruit size could be attributable to either CTV or physiological size reduction due to overbearing stress. Interestingly, trees inoculated with isolates T 33 and GFMS 35 exhibited high yield efficiency as well as large fruit sizes.