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• W2188187149 abstract "'Hass' avocado trees on Duke 7, G6 and G755C rootstocks were planted in 1987. In 1989, trees on all three rootstocks bore a first small crop. In 1990, yields averaged 33, 15 and 6 kg per tree for 'Hass' on Duke 7, G6 and G755C respectively. This ranking was reversed for trunk circumference measurements. There was no difference in quality of the fruit grown on the different rootstocks. However, the shape of 'Hass' fruit grown on Duke 7 was significantly rounder than 'Hass' on G6 and G755C, which were more pear shaped. The commercial use of clonal rootstocks is relatively new in avocado growing (Whiley et al., 1990). In South Africa, the devastation caused by Phytophthora cinnamomi in avocado orchards led to the importation of several new rootstocks from California including Duke 7, G6 and Martin Grande selections (collectively G755A, G755B, G755C). While considerable advances have been made with the development of Phytophthora root rot tolerant rootstocks only little information regarding the productivity and fruit quality of important cultivars grafted on these clonal rootstocks is available (Whiley et al., 1990). Ben-Ya'acov (1987) has shown that different avocado rootstocks can perform considerably differently with the same scion-clone grafted on them. Similar observations concerning the performance of 'Hass' as a scion on some clonal rootstocks have been made by Bergh et al. (1988) and Whiley et al. (1990). However, it appears that commercial 'Hass' plantings on different clonal rootstocks are presently planted in several avocado growing countries without having sufficient information available. In this paper, recently available data on the horticultural performance of 'Hass' grafted on three clonal rootstocks are reported. Materials and Methods A 'Hass' orchard (approx. 3 ha) was established at Westfalia Estate (North-Eastern Transvaal Lowveld, latitude 24°S) at a spacing of 5.0 by 5.0 m using equal numbers of Duke 7, G6 and G755C rootstocks. Trees, all equal in size, age and scion, were planted in March, 1987, in well-prepared soil. The soil type is a fine-loamy, mixed paleudult (USDA, 1975) with a clay content of approximately 40%. The trees are irrigated by minisprinkler using tensiometers, i.e. replenishment of soil moisture to field capacity when soil moisture tension reaches 50 to 60 kPa. In July, 1989, and 1990, tree health, trunk circumference and yield were recorded for 37 trees on each rootstock. Tree health was rated according to a disease index of 0 (healthy) to 10 (dead) as described by Darvas et al. (1984). For tree size determination, trunk circumference was measured 20 cm above ground level. Fruit quality was evaluated after four weeks of cold storage at 5C using 70 fruit (weight range 266-305 g) grown on each of the three rootstocks. In 1990, pericarp and seed weight as well as fruit length and diameter were recorded for 50 fruit (weight range 266-305 g) grown on each of the three rootstocks." @default.
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• W2188187149 title "Field Evaluation of 'Hass' Avocado Grown on Duke 7', G6 and G755C Rootstocks" @default.
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