I have 1 Mandarin, 1 Lemonade, 1Orange and 1 Navel Orange. All have been very neglected while we were gone for 2 years. They are a real mess. They are full of gall wasp, scale, sooty mould, leaf miner. Branches low to the ground and covered in mud etc. Even the meat ants have made a home in the navel by wrapping some leaves around their nest. (something I’ve never seen before)
My question, and I realise that not everyone will be able to answer for me. Would I be better to chop these trees right back to a few main branches and kind of start from scratch again or just deal with each problem separately then fertilise and water them back to health.