Disease in my soil?

[miatapa]

I'm growing about 15 tomatoes, primarily Paul Robeson heirlooms I started from seed. I have one huge one in a big pot & the rest are now in the ground. After being planted they have all developed a leaf curl within about 4 days (they were not planted the same day, but as much as a month apart). It's not restricted to that variety, it has also happened to a Jetstar and several others. No 2,4-D in the vicinity that I'm aware of. I spaded in composted manure last fall, which I thought might be the cause, but then remembered that it also happened last year prior to the manure compost. The tomatoes survive it but I'm sure it sets them back. The one in the pot does not have the curl. I've sprayed some of the affected ones with insecticidal soap but to seems to not make any difference. They are watered with untreated secondary water (from the local reservoir) but so is the unaffected one in the pot.

The only thing I can surmise is something in the soil may be causing it. Does anyone have experience with this sort of problem?

Thanks for any ideas.

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