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Aphids - how much of a problem are they?

in Plants
I'm only a couple of years into gardening, and last year all my plants were new. One of the blueberry bushes became very badly infested with aphids, and no amount of water spraying or wiping made a difference. I got so fed up I just started cutting off the new branches because they like new growth the most. As a result, the bush has not produced flowers this year although it isn't dead. I've learnt my lesson there.
My young plum tree and young cherry trees are both already infested, the cherry with black aphids. Should I stress about this (as I am), or not worry too much? There are just too many leaves for me to get on top of it. I don't want to do to the trees what I did to the blueberry bush. RHS site says by summer their natural predators turn up, but this did nothing to reduce the problem last year. I obviously don't want to use pesticides because I don't want to harm other insects. I've read very mixed things about buying ladybird larvae too.
My young plum tree and young cherry trees are both already infested, the cherry with black aphids. Should I stress about this (as I am), or not worry too much? There are just too many leaves for me to get on top of it. I don't want to do to the trees what I did to the blueberry bush. RHS site says by summer their natural predators turn up, but this did nothing to reduce the problem last year. I obviously don't want to use pesticides because I don't want to harm other insects. I've read very mixed things about buying ladybird larvae too.
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A bare plot for example, in among other bare plots, can take years to get a good balance. If there's reasonable wildlife in the area, it's quicker. Blue tits for example, will eat tons of them, especially at this time of year, or earlier, when feeding their young.
Some plants are more susceptible too, so that's where deciding on what to grow becomes important.
I have very few aphids. Nothing to do with ladybirds, but by growing plants that suit my conditions, and many of those aren't inclined to produce the sort of growth that attracts them anyway. Any that do get eaten by those blue tits, or get wiped off, but usually they aren't bad enough to warrant that.
I live in west central Scotland - not where that photo is...
So I will struggle a lot to even get smaller birds to notice the feeders, much less have a chance of getting a look in. They have a much safer habitat out the front and a house further up the street has hung feeders from the small wild bushes opposite their house, on the edge of the field, where small birds can feed safely next to lots of hiding places for when the many surrounding cats and larger birds turn up.
I think it's said that tits, sparrows etc. will range a couple of miles. So ignore your near-neighbours' set ups - as long as there's something within a couple of miles, it's all good. We have a neighbourhood of cats and back on to open farmland, so not ideal for small birds. And, like you, several neighbours had massive feeding stations so they weren't in need of more nuts and seeds...
So I decided to offer something different. A pond, berry-bearing plants and trees (crab apple and pyracantha), a vigorous plant that I knew would attract aphids aplenty (honeysuckle) and two blue tit houses, one on a north facing and one on an east facing wall to avoid prevailing winds. We had both boxes used in year one, one box used in year two and that same box in use currently for year three. The tits weren't really interested in my feeders, tending to go three doors down for that, but being 'home' meant they'd fly straight past my amelanchier and crab apple, constantly diving in to both to pick off aphids.
Our first year with the crab apple was a right off - constantly spraying garlic and unpicking curled up leaves - but this year it's fantastic. There are still aphids, and still ants farming them, but we've had a healthy blue tit brood in there last year and no real leaf damage this year...so far.
Our garden is very small, and is/was indeed a bare plot among bare plots. Additionally, the growing conditions are not great and it's all very wet, and lots of it is always in shade. I'm limited with what I can plant, many of my other questions on here are asking what I can even get to survive here! Trial and error is expensive. I don't have a great deal of choice around what we can do with the garden unfortunately.