What’s wrong with my fruit trees and how do I treat them?

Question

I fertilised them in April/May, water weekly while it’s Winter around the base only. I see there are very small black bugs on them? Leaves are curling, turn red/yellow.

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Answer 1

Watering once a week in winter is probably too much unless it's very dry. You can water further out than the base, because the roots have spread out.

Here are common fruit tree diseases. We have more information for each type of fruit tree. Just search the gardeningknowhow.com site for your particular fruit trees. There is a leaf curl disease which has a symptom you mention. Leaf reddening can be due to stress, disease or insects. Bugs on fruit trees are often aphids or spider mites.

https://www.gardeningknowhow.com/edible/fruits/fegen/common-fruit-tree-diseases.htm

https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=38749