Refrreing to wisteria, I do not know. But your second question - how often do you water your orange pippin apple tree? It needs sun, but not so much water. Try to exchange the soil, exchange it for something fertile and put it on the sun. Then water regularly but modestly twice a week.

Is it possible your Wisteria is hiding lots of snails or slugs? Pop out at night with a torch and check if there are any there, though usually you'd see the trails. Otherwise, if there are lots of little holes all over the leaves, it could be shothole, but causes of that vary from fungal infection to bacteria, and usually the leaves show brown spots which then drop out, leaving holes behind, sometimes with a yellow halo, sometimes not. Difficult to treat without ascertaining the cause.
As for the apple, could be woolly aphid, though this tends to collect more on the stems beneath the leaves, but it does look like cotton wool. Other possibility is mildew.

On the Wisteria, if the holes are very neatly cut it could be leaf cutter bees, leave them alone, other than that many other pests will eat the leaves, use a pesticide. It could be woolly aphids on your Cox's orange pippin, clean off with a gloved hand, treat with winter wash in December.

Sorry Bamboo we were answering at the same time.

sorry to steal your question jean . i hope your well lol . one of my red acers has got little wooly looking packages on the underside and its curling the leaves up and killing them . would this be the wooll aphids you talk of please ? excuse me take care bye for now xx.

Hi Leigh, hope you are well also, It may be a leaf curling insect, they pupate in the curled up woolly web and often hang out on a single strand as they fall to the ground. The best way of dealing with them is to rub them off. If it's a high tree take care climbing a ladder. LOL.

thank you so much doc . i hope your well mate .