Are you trying to eat them right now? if so, the new fruit for this year almost certainly is not ripe yet. The old fruit, now a year and a half old, is way way way over ripe and would be all dry. Pull the old fruit off and let the tree put it's energy into this years crop. Oranges are generaly ripe sometime December to February, or a little later for Valencia types.
Hope that helps
Arthur the date palm guy

I have several orange trees , they are producing plenty , very juice oranges, but they have no flavor. What could be causing this.?

>Pull the old fruit off and let the tree put it's energy into this years cropOnce the fruits were fully formed the energy had already been spent.

Some seedling orange trees produce very bland fruit. Some give good
sweet fruit. If you have no graft line it may be a seedling.

Try fruit thinning, and keep it from staying really dry for more than a week in warm weather.

>Pull the old fruit off and let the tree put it's energy into this years cropOnce the fruits were fully formed the energy had already been spent.

Not true there is so much research that confirms leaving fruit on the tree will reduce next years crop. So obviously the tree uses lots of energy to maintain the fruit.

My blood orange tree is 7 years old. It produced fruit only three times so far. The crops of oranges were tasteless other than a sweet flavor, but not a good sweet flavor and absolutely no citrus taste. Absent of citrus! The flesh is very pretty , juicy and healthy looking but nasty flavor. My other citrus trees have good fruit. It gets regular water via automatic water system. I use citrus fertilizer as well as 15-15-15. I've tried over fertilizing and under fertilizing.

Could it be missing a particular nutrient? The tree came from a reputable grower. Any ideas? I plan to give it another 2-3 yrs then I'm pulling it. My mothers tree produces the best tasting oranges ever. I want the same!

pip313:

I have heard the story of the fruit taking much energy to maintain before and don't totally believe that. A much older and more time tested principle is that the tree produces seeds (fruit) to maintain existence of the species. If there is ample supply then there is no need to reproduce more and there is less blossoming. A parallel to this is in the wild trees which produce over abundance in drought stressing years.

jackeetj:

Some blood oranges, especially Moro, turn from sweet and flavorful to overripe and with a strong disagreeable after taste. Climate has a tremendous effect on citrus flavor. Where are you growing this tree? How is the climate compared to normal ?

If that's how you want to look at it but commercial growers know they loose significant production if fruit is left on too long.

some varieties are sold with the explicit warning that they are even more prone than normal.