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Currently, the California pistachio industry relies upon 4 rootstock;  Pistacia integerrima, P. atlantica  and 2 different hybrids of  P. atlantica × P. integerrima.  Although observations have been made, no trials have established the relative cold tolerances of these rootstock. The above four rootstock were planted in June, 1989, in Shasta County, California. Each rootstock was repeated once within the 100 replications of the randomized complete block experimental design. The trees were unbudded. The lowest winter temperature of 14°F (-24°C) occurred in February, 1990. When the trees were rated for damage in April, 1990,  P. atlantica  displayed only 3% mild tip burn damage compared to 56% tip burn for  P. atlantica × P. integerrima  (commercially known as UCB #1), 79% tip burn for  P. atlantica × P. integerrima  (commercially known as Pioneer Gold I) and 95% severe dieback for  P. integerrima.  Five superior  P. integerrima  rootstooks, with no damage, were identified.

RELATIVE COLD TOLERANCE OF FOUR UNBUDDED PISTACHIO SEEDLING ROOTSTOCKS