I have had what looks like a pest infestation on my tree. The only way I could solve it, was by taking a photo with my phone, and enlarging the picture. Can someone please help me, by telling me what it is I'm dealing with???

Hey Alimoo,
Nor spider, nor ant. : )
Sadly need some better photo, or at least few different angles to identify correctly.

Spiders and ants do not harm your tree.

Can't see the details, but I 'm going to guess these are aphids. They will damage the tree or plant

Six legs and green. Greenfly?

m5eaygeoff wrote: Six legs and green. Greenfly?

"Aphids are small sap-sucking insects and members of the superfamily Aphidoidea. Common names include greenfly and blackfly"

(wikipedia)

If you click on the attachment, it will show the bug Felidae. Thanks for replying

Alimoo wrote: If you click on the attachment, it will show the bug Felidae. Thanks for replying

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I saw it, that’s why I asked for more images : )
Geoff and Auk are probably right.
I cannot give a sure conclusion from your only photo, but the body morphology could be aphid-like.

Where aphids, there ants.Those bstrds keep them like cows... If I remember right, we have a topic somewhere where you can see some ants during milking aphids while they living on my tree.

I put another photo up of a dead one. They are very hard to see, like a piece of dust

Aphid. But I already said that.