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This is where birds are your friends. Birds think grubs are yummy.
I have never had to personally deal with grubs. And I have yet to encounter an organic grower that has had to deal with them. But I have had many people write to me and ask how to deal with grubs organically. Nearly all of them have mentioned "Last year I sprayed toxic goo to get rid of the grubs and now they're back". While I did not see what happened, my guess is that birds and other natural grub control ate the dead grubs and died. No more natural grub control.
So the trick is to kill the grubs, but don't harm anything that eats grubs. The answer is to bring in more grub predators.
Having done a little reading on this topic, "Milky Spore" (Bacillus popilliae) and/or predatory nematodes appear to be the organic control. "Milky Spore" is a naturally occuring bacteria that makes the grubs puke their guts out, but it doesn't seem to bother anything else. So if a bird eats a dead grub, the bird will be fat and happy. Predatory nematodes (also called "beneficial nematodes") are like micro worms that crawl through the soil and eat a variety of different organisms, including grubs.
"the qualities of these bacteria, like the heat of the sun, electricity, or the qualities of metals, are part of the storehouse of knowledge of all men. They are manifestations of the laws of nature, free to all men and reserved exclusively to none." SCOTUS, Funk Bros. Seed Co. v. Kale Inoculant Co.
[img]http://i109.photobucket.com/albums/n52/havlik1/permie%20pics2/permiepotrait3pdd.jpg[/img]
"One cannot help an involuntary process. The point is not to disturb it. - Dr. Michel Odent
[img]http://i109.photobucket.com/albums/n52/havlik1/permie%20pics2/permiepotrait3pdd.jpg[/img]
"One cannot help an involuntary process. The point is not to disturb it. - Dr. Michel Odent
Elfriede B wrote:
I am seriously thinking pigs.
"the qualities of these bacteria, like the heat of the sun, electricity, or the qualities of metals, are part of the storehouse of knowledge of all men. They are manifestations of the laws of nature, free to all men and reserved exclusively to none." SCOTUS, Funk Bros. Seed Co. v. Kale Inoculant Co.
[img]http://i109.photobucket.com/albums/n52/havlik1/permie%20pics2/permiepotrait3pdd.jpg[/img]
"One cannot help an involuntary process. The point is not to disturb it. - Dr. Michel Odent
[img]http://i109.photobucket.com/albums/n52/havlik1/permie%20pics2/permiepotrait3pdd.jpg[/img]
"One cannot help an involuntary process. The point is not to disturb it. - Dr. Michel Odent
Brenda
Bloom where you are planted.
http://restfultrailsfoodforestgarden.blogspot.com/
25X40 feet??? it was well worked by the end of december and we got the pigs in september. if that gives you something to work with. they were only about 50lbs to begin with. I wish I would have taken them out a bit sooner but I wanted to get them up to the ideal butcher weight and didn't have anywhere else to put them. 
mine got a mix of regular pig food, scraps and bread lots of pecans (they loved crunching pecans!) and whatever they managed to scrounge up in the area they were in. [img]http://i109.photobucket.com/albums/n52/havlik1/permie%20pics2/permiepotrait3pdd.jpg[/img]
"One cannot help an involuntary process. The point is not to disturb it. - Dr. Michel Odent
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It used to be a lot bigger, but now it is a rather tiny ad:
The new purple deck of permaculture playing cards
https://www.kickstarter.com/projects/paulwheaton/garden-cards
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