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What mesh to protect Brassicas?

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argonaut:
Building some tunnels to protect Brassicas  - following this style:
http://kgarden.wordpress.com/2009/05/04/brassica-netting-against-cabbage-white-butterfly/

What mesh should I be using .... looked on :
http://www.gardening-naturally.com/acatalog/Enviromesh_Insect_Netting.html

I had read that cabbage whites can lay eggs through teh mesh on normal mesh ... so would i need extra fine or enviromesh ?
Don't want to block water passage.

DD.:
I use debris netting as it's so durable compared to other meshes, but you don't have to.

The 7mm stuff would be fine to keep the butterfiles out, what you have to be careful of with any netting is that there is always a clearance between the netting and the plants.
If there isn't the butterflies can just poke the tip of their abdomen through any small hole and lay their eggs on leaves touching the netting.

kevinp:
This seems to be the cheapest way to buy the netting netting remember as the blog says to buy it wide enough to create height over your plants

DD.:
There are actually some deals on ebay that are a little cheaper than that. It's that little thing called VAT that they slap on as you go through the ordering process that bumps their price up.

argonaut:

--- Quote from: kevinp on March 07, 2011, 07:25 ---This seems to be the cheapest way to buy the netting netting remember as the blog says to buy it wide enough to create height over your plants

--- End quote ---

noticed thoiugh that this say  "considerably reduces rain and wind penetration "

is the reduction in water passage an issue.

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