ATTACK of the red spider mites except yours look HUGE!!. that tree is infested with them. if its warm enough outside you need to blast that tree with water on all sides of the leaves and trunk. if its too cold I guess you could do the same in the shower. you could also use an insecticidal soap if you cant take it outside. Once you get the pest under control continue to water when the soil almost dry and fertilize lightly once a month or so until spring.

Thanks for quick reply! Lime tree has now had a shower - the girlfriend will kill me but guess better than 1000's of spiders running around!. It looks like the majority of red spots are gone.

The orange tree did not have any red spiders mites.

I've been watering every week and regularily fertilising but still no mature fruits so still bemused as to why not...

that picture of the flower covered in mites is why you arent getting any fruit. keep a close eye on both of them because they are persistent little suckers and will most likely come back. Keep doing what you are, keep the pest away and soon you will get some fruit.

mike

Andy, I agree with Mike about showering regularly.
Even though you might not spot the little creatures, they have a way of coming back.

One reason I like misting leaves on a daily basis. A couple drops of dish soap keep mites at bay, too. Toni