FIELD PERFORMANCE OF JUNE YELLOWS-AFFECTED CLONES OF BLOMIDON STRAWBERRY

Clones of 'Blomidon' strawberry (Fragaria x ananassa Duch.) exhibiting a range of June yellows symptoms were grown in field plots to measure effects on productivity and fruit characteristics. Self-pollinated se edlings grown from these clones were evaluated for symptom expression as an additional measure of severity of June yellows, Large difference s in fields were recorded among clones, ranging from 1.9 to 14.7 t . h a(-1) in 1991 and 8.4 to 28.3 t . ha(-1) in 1995, Clones with severe s ymptoms produced smaller fruit than clones with slight symptoms in 199 4 but not in 1995. Small differences existed for the titratable acidit y of the fruit but not for soluble solids concentration. The frequency of normal green seedlings among selfed progeny ranged from 48% to 98% and was negatively correlated with symptom severity ratings of the pa rent clones. Severity ratings and selfed seedling abnormality rates we re good predictors of fruit yield, No clones of 'Blomidon' were free o f June yellows.