Hi there, we have a 3 year old 2ft Chinotto orange tree, it's leaves are covered in a sticky substance, we cant tell whether the leaves have oused this or whether its a result of something else, anyone any ideas. Thanks
Probably a colony of aphids have got in there. The sweet sticky substance is what they excrete.
Can you see any teeny tiny papery husks lying on leaves or on the edge of the pot? You are unlikely to see the insects themselves but you might see these things which are their cast off skins.
A quick spray with some systemic insecticide should sort them out.
Thanks very much for your help, my wife is washing the tree (well 2ft!!) with soapy water & then we will spray it
Check for scale insects as well. They can be removed with a piece of cotton wool soaked in meths.