PEAR BREEDING - TRANSMISSION OF RESISTANCE
Inoculations were undertaken in greenhouse at Wageningen (I.P.O) during three years: four progenies in 1980, thirteen in 1981 and six in 1982. Three classes were made after inoculation: no symptoms, dead with symptoms but not dead (middle susceptibility).
The great interaction between the years and the progenies does not allow to use the diallel design to calculate the results. These ones are given year by year.
'Mac' seems to be a good parent : in this trial it is the best for the percentage of "no symptoms". 'Michigan 437' gives the best percentage of "middle susceptibility".