what are these insects?
I'm brand new here so any help appreciated...I have had a Meyer Lemon Tree for 2 years now and has suddenly gone down hill... yellowing leaves etc.. I inspected it closely today and found a lot of these white insects on the undersides of the leaves... they seem to be more like insect casings rather than insects themselves (?). I'm a total novice really and need some help...I'm guessing the yellow leaves are a separate issue to the insects though...
p.s. I live in New Zealand if that makes a difference!