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Clones of 'Blomidon' strawberry ( Fragaria ×ananassa Duch.) exhibiting a range of June yellows symptoms were grown in field plots to measure effects on productivity and fruit characteristics. Self-pollinated seedlings grown from these clones were evaluated for symptom expression as an additional measure of severity of June yellows. Large differ- ences in yields were recorded among clones, ranging from 1.9 to 14.7 tha -1 in 1994 and 8.4 to 28.3 tha -1 in 1995. Clones with severe symptoms produced smaller fruit than clones with slight symptoms in 1994 but not in 1995. Small differences existed for the titratable acidity 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 parent clones. Severity ratings and selfed seedling abnormality rates were good predictors of fruit yield. No clones of 'Blomidon' were free of June yellows. old was reached, chlorophyll synthesis would be inhibited. More recently, Rose (1992) sug- gested that June yellows may be an example of hybrid variegation that arises after interspe- cific crosses in plants with biparental plastid inheritance, resulting in a nonharmonious in- teraction between the plastids of one parent and the hybrid genome. An unequal distribu- tion of the two types of plastids to the daughter cells at mitosis will tend to sort out the plastids into homoplastomatic lines. This process will take time and is hypothesized to account for the delay in symptom expression; it also may explain why persistent green clones of culti- vars affected by the disorder can be found. Demaree and Darrow (1937) suggested and Rose (1992) reaffirmed that selfing might prove useful as a test to reveal potential yel- lowing in the genetic stock. Williams (Brown, 1954) reported that a symptomless clone of 'Blakemore' gave 5% yellow seedlings when selfed in 1952 and 13% when selfed in 1953. Symptoms of June yellows appeared in the clone in 1954. Williams (1955) also found that the percentage of yellowed seedlings given on selfing was porportional to the severity of the symptoms shown by the parental 'Blakemore' clones. June yellows is especially trouble- some for strawberry breeders because it can, without warning, cause the loss of a useful cultivar.

Field Performance of June Yellows-affected Clones of `Blomidon' Strawberry