I have got horse nettle coming up in my blackberry rows and in some places where the nettle is touching the blackberry stems, the stems have died. They are thornless Navaho blackberries. It started out that a few (3) portions of the stems had turned brown in an area about 3 or 4" long, then everything past that died. Does anyone think this may have to do with the horse nettle or should I look for something else? This seems to have only happened where the nettle was touching the stem. I have never sprayed my blackberries with any fungicide or insecticide and they never had a problem in the three years they have been in this spot. I have also heard warnings against having raspberries too close. There are raspberries within 20' of the plants. I had not heard anything about not planting them together before I did it. Could it be the raspberries?