if you can, move the blackberries and then kill the poison ivy. cut it back and pour vinegar on the roots. DO NOT burn the cut ivy, particles in the smoke can cause a severe rash.
This is my method. See what you think about it for your own situation. Depending on how much poison ivy there is and how sensitive to it you are, first, to protect yourself, wear clothing that the oil will not penetrate and you can launder afterward. or you can buy a paper and plastic coverall (available at big-box hardwares). Also buy a pair of extended-length rubber gloves you will throw away afterwards. Wear boots you can clean with TechNu (I found it at Walmart) or some other remover for poison ivy oil. Wear a mask, if sensitive. Cut out vines where you can safely do so. Be sure to clean your shears afterward. Next, wet down the area to make it easier to pull up the roots and get out more of it that way. For disposal, line a trash can with a large trash bag and immediately add each piece. Alternatively, get a small foam paint brush and a small container filled with RoundUp and carefully paint just the poison ivy leaves. Make sure to wet all the leaves thoroughly and don't let any drip onto the blackberries. If any does, pull off the blackberry leaf right away. The plant will not miss one or two. Be especially careful not to come in contact with the ivy. If that happens, use the oil remover right away.
Here is the homemade poison ivy vegetation killer spray that I’ve found is safe and effective:
Poison Ivy Vegetation Killer
1 cup salt
8 drops liquid detergent
1 gallon vinegar
Combine the salt and vinegar in a pan and heat to dissolve the salt. Cool the vinegar, add the detergent, and pour some of the liquid into a large spray bottle. Spray the vegetation. (You can also just pour the mixture onto the weeds.) Refill the spray bottle as necessary. Note that this formula will kill all the vegetation, so make sure that you are only spraying the plants you want to kill. If you need to use a lot of this spray, avoid spraying it near wells, as the salt can leach into your water supply.
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if you can, move the blackberries and then kill the poison ivy. cut it back and pour vinegar on the roots. DO NOT burn the cut ivy, particles in the smoke can cause a severe rash.
This is my method. See what you think about it for your own situation. Depending on how much poison ivy there is and how sensitive to it you are, first, to protect yourself, wear clothing that the oil will not penetrate and you can launder afterward. or you can buy a paper and plastic coverall (available at big-box hardwares). Also buy a pair of extended-length rubber gloves you will throw away afterwards. Wear boots you can clean with TechNu (I found it at Walmart) or some other remover for poison ivy oil. Wear a mask, if sensitive. Cut out vines where you can safely do so. Be sure to clean your shears afterward. Next, wet down the area to make it easier to pull up the roots and get out more of it that way. For disposal, line a trash can with a large trash bag and immediately add each piece. Alternatively, get a small foam paint brush and a small container filled with RoundUp and carefully paint just the poison ivy leaves. Make sure to wet all the leaves thoroughly and don't let any drip onto the blackberries. If any does, pull off the blackberry leaf right away. The plant will not miss one or two. Be especially careful not to come in contact with the ivy. If that happens, use the oil remover right away.
Here is the homemade poison ivy vegetation killer spray that I’ve found is safe and effective:
Poison Ivy Vegetation Killer
Combine the salt and vinegar in a pan and heat to dissolve the salt. Cool the vinegar, add the detergent, and pour some of the liquid into a large spray bottle. Spray the vegetation. (You can also just pour the mixture onto the weeds.) Refill the spray bottle as necessary. Note that this formula will kill all the vegetation, so make sure that you are only spraying the plants you want to kill. If you need to use a lot of this spray, avoid spraying it near wells, as the salt can leach into your water supply.