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The new observation block contains four experimental rootstocks and four commercial rootstocks including VX211, Vlach, RX1, and seedling Paradox. The rootstocks were June budded to the Chandler variety.
The Tulare block is one of six walnut rootstock trials established in California. The project is supported by a Specialty Crops Research Initiative grant and by the Walnut Board of California.
In a separate trial, Fichtner says commercially-available products sold for tree protection from soilborne fungi will be tested on seedling Paradox rootstock.
The root treatments include: endomycorrhizal fungi (MycoApply EndoMAXX, Valent); a bacterial biocontrol agent (Activate, Natural Resources Group); and a botanical extract mixture containing salicylic acid, a known compound involved in induced resistance (Root Rx, Redox Chemical).
Tree Nut Updates
