Hi Lads,
I bought this heat cable.Instructions say heats to 25c above ambient temperature i plugged it in and turned it up to the highest temperature.
After about 15 mins cable was warm to the touch.Would this be enough to form callus?
The website says they’re closing down? What are you trying to do exactly? Keep your plants from freezing or the ground from freezing? It says you’re in zone 8 so it shouldn’t be too cold over the winter months?
Hey Melon
I am trying to create a hot callus pipe
Oh i didn’t even know that existed until now. Reading up on it now.
Goodluck in your ventures, this grafting technique is extremely new to me.
Its for difficult types like walnuts and maybe useful for persimmon
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Depends on the type of fruit graft you want to callus! The below data should help you set your temperature for the variety you are grafting. You want to be very near optimum for best results. Persimmons need to be around 70 F. Best wishes!
Dennis
Kent, wa
Callusing temperatures of Fruit and Nut trees
Posted on May 21, 2013 by qwertyqweryt61
People ask me what are optimum callusing temperatures to ensure a good percentage of viable grafts.
Nectarines/Peaches – 18-26 deg C. ( 64.4 to 78.8F)
Apricots/Cherries – 20 deg C. ( 68F)
Plums – 16 deg C. ( 60.8 F)
Apples/Pears – 13-18 deg C. ( 55.4 to 64.4F)
Walnuts – 27 deg C. (80.6 F)
Grapes – 21-24 deg C. ( 69.8 to 75.2 F).
Figs - 23.9- 29.4 deg C. ( 75-85 F).
Do not forget tissue damage for most temperate fruit will occur at temperatures over 30 deg C. (86 F). So if you use electrical tape or any dark materials to graft, cover them with aluminum foil to prevent the sun from killing healing tissues.
Temperatures either side of the optimum will also work, but the percentage take will be reduced. See graph below for walnuts.
Callus graph showing optimal temperature range
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Great info Dennis thank you for sharing