potatoes with holes and bitter blackcurrants

Hello!

I have a blackcurrant bush growing in the garden about two years now, and it never bore any fruit until this year and it is absolutely covered in blackcurrants. The fruit is really dark I was wondering when do you actually pick the fruit I have tasted one of the berries and it dont taste like blackcurrant!
Also I have potatoes in the pollytunnel there maris piper and I dug a few up but I noticed that some opf the potatoes had a tiny hole in them with a very tiny worm in it, could anybody tell me what it is and how do I stop it?
Brenda

For me,you can pick your blackcurrants anytime now. Just leave them in a bag for a few days and they will come to full ripeness. As for your spuds,I am sure Maris piper are lates and shouldn't be anywhere near ready yet.  It's possible you have a wire worm problem, maybe someone else can give you advice on that one.

The flowers on early potatoes is an indication that there may be some ready for lifting as immature "new" potatoes.

Main crop should be left until the foliage dies down.

Massa, it sounds like wireworms in your potatoes.
WIREWORM.

Wireworms are a great pest of potatoes causing many of the smaller 3 mm holes in the tubers. They are the larval stage of a beetle, Agriotes lineatus, and are particularly common in ground that has been very grassy or weedy for several years. Sadly, the larvae can live in the ground for up to 4 years eating roots, before they pupate and emerge as click beetles in the summer.

Destroy them by crushing between your fingers whenever you see them on site while digging over your soil and when earthing up your potatoes. Lift your potato crops as soon as they are full grown to prevent further damage.

DD thank you for that link it is good to have pictures for reference and I think I may have fed a couple of the eel worms to the birds when preparing the beds earlier (i hope I didn't miss any )

this is the link http://www.gardensafari.net/english/centipedes.htm the ones that are eating my spuds are the spotted snake millepedes on this page.