I agree about having a polytunnel if at all possible. I would suggest that in a very windy area such as Orkney you position the tunnel so a corner faces into the strongest winds. Here our tunnel is placed west-east to catch the most sun and our strongest winds tend to come from the SW, so they catch the tunnel on the corner. We didn't plan this, just observe the outcome. Direct southerlies tend to rip the cover off, by causing a vacuum on the north side, and straight westerlies or easterlies can smash the end in, where the door and louvres are. But when the wind hits on a corner it seems to decrease the overall effect.
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We seem to be suffering horribly from vermin in our veg areas here this year. I think it's due to a neighbour digging out an old shed which rats etc used to lurk under, so now they are all coming to see us, and are rabidly vegetarian. This means all our beetroot were hollowed out in the autumn, so no crop, and all legumes had their pods raided as they grew. I think that's what destroyed the PSB.
Does anyone have any idea on how to prevent that sort of damage? I'm finding it very disheartening. I cope with the little devils in spring by starting most things off in 3" pots in bakers trays suspended from the crop bars, so that's no longer the problem. It's so much worse to have spent the growing season nurturing all those lovely veg in the adverse conditions of where we live, only to feed vermin
Hollowed out beetroot .. usually means voracious slugs , birds , millipedes or wood lice the attack starts in tiny cracks or where there is evidence of wet rot
Snails but mainly slugs & birds especially pigeons also cut out the green flesh on beans to get hold of the soft bean .
I think that rats themselves tend not to be green style vegetarian eaters . They tend to be dry high starch / carbohydrate grains , dried legumes or oiled feed animal feed eaters.
That said I have seen rats eating broken off sugar beet tap roots that have been brought to the surface when the field has been tilled and the weather has been horrific such as during the severe winter of 1962/3 when farmers were having to use pneumatic road drills to get over wintering carrots out of the ground .
The rats didn't hollow the sugar beet out , they ate them completely . Starting from the biggest broken end then going right along it to the very thin tip .
Did you find any evidence of tiny chisel marks in pairs of the rats two front teeth on the beet roots ?