Most packers had several labels they could use.  The primary color of the label indicated the grade of the citrus in the box.  Blue was US #1, the best quality from the packer. Red was US #2, a step down and occasionally another color was used for fruit not making US#1 or US #2.  It should be noted that almost all the Florida fruit that did not meet US#1 standard was due to external appearance.  The internal quality was the same!  Florida conditions, namely a hot wet summer, produced a large number of pests that would damage the surface of the fruit.  The primary one is very small mite, specifically the rust mite.  This pest can produce a dark brown or russet blemish on the surface of the fruit.  Several fungal organisms also can cause damage to the peal. Melanose produces small raised spots producing a fine “sand paper’ feel.  When heavy these lesions can cover a large portion of the fruit surface as well. Windy conditions during spring when the fruit are small cause surface damage as well (this is known as wind scar – the small fruit would rub against leaves producing a superficial blemish to the peel).
 
Florida growers have to deal with these superficial blemishes because the consumer is looking for a perfect looking piece of fruit.  Sugar content cannot be determined by looking the fruit, so don’t be quick to decide that if an orange is not perfect on the outside that does not mean it will not taste good.  Florida citrus might not be the prettiest in the bin, but they cannot be beat for taste.