Rootstocks for 'Alpine' Nectarines on Sandy, Nematode-Infested Soils

摘要

Nectarine orchards were established on nematode-infested, sandy (>90% sand), slightly acid (pH 5.8, KC1) soils in the northern peach producing region of South Africa. 'Alpine' scions on 16 different rootstock cultivars were evaluated over three, threeand 6 harvests after the orchards were established in 2009,2008 and 2000, respectively. Trees on Flordaguard gave higher average and cumulative yields than on all other rootstocks in the 2009 and 2000 orchards, but did not differ (at P = 0.05) from Cadaman in 2008. Yield efficiencies on Flordaguard were higher than on Cadaman, Guardian, SAPO 778 seedling and Kakamas in 2008, SAPO 767, Penta and Tetra in 2009, and SAPO 778, SAPO 778 seedling, Nemared, Cadaman and Adafuel in 2000. Fruit weights from trees on Flordaguard and Atlas were high and did not differ, but were low for trees on GF 677 and Kakamas seedling in 2008, Penta and Tetra in 2009 and Ferciana in 2000. Trees on Kakamas seedling consistently produced lighter fruit than on Atlas. Trees on Flordaguard promoted large trunk circumferences compared to trees on GF 677 and Kakamas seedling in 2008, Kakamas seedling, Penta and Tetra in 2009, and Kakamas seedling, Viking, GF 677 and Ferciana in 2000. The 'Alpine' nectarine trees perform well on Flordaguard rootstock in sandy soils with low to medium numbers of ring and high numbers of root-knot nematodes.