Polytunnel repairs

Hello

My newly inherited polytunnel seems to have lots of little holes in the roof.. Any ideas of best way of repairing many small holes and perhaps what caused them?

Also, it seems to have a wooden frame at the ends, I suspect this may one day rot. Is there anything I can try to treat it with (guessing the timber was treated to start with? One never knows with inherited things)

I blamed same holes in mine on birds seeing spiders and grubs etc on inside of poly and trying to get them from above. There are lots of repair tapes on market, I get mine from First tunnels. Suggest you are generous with width taped over.
I have also put a good width of debris netting full length of tunnel over top of tunnel to make birds less likely to land up there

I think it is important not to get it too tight so birds are unhappy walking on it. I cut a good length (my tunnel is 30ft long and 14ft wide) and had to sort of drag it onto crown of tunnel but puts lengths of string at intervals on each side first. I then staple gunned it to the top part of the door frames at each end on mine as they are timber. I had intended to peg the strings but that put them too tight to poly walls and I thought they would rub so I used stakes about a metre or so high some distance off from poly walls to tie off to, Not elegant but seems to work. As netting shuffles about in wind it keeps algae growth down as well.