Effect of cv Colin V-33 as interstock on avocado (Persea americana Mill) growth, cv Fuerte

SYNOPSIS Colin V-33 (a dwarf avocado) used as interstock in pieces ranging from 10-30 cm and from 30-50 cm in length were used to evaluate their effect on the growth of 11-year-old Fuerte scions. The rootstocks of the combinations were Mexican type seedlings. The results indicate that the piece of the interstock ranging from 10-30 cm reduced the height of the scion by 38,8 per cent while the piece of 30-50 cm reduced it by 47.33 per cent Fuerte scions without interstock showed an average height of 5.98 m as compared to 3,66 and 3,15 m of the trees with shorter and longer interstocks respectively. A reduction in canopy diameter, circumference of scion and main branches and the distance to the point where the main branches commenced, were also found. No differences were noticed in canopy thickness and in circumference of the rootstock. These findings indicate the potential use of Colin V-33 as a dwarfing interstock for avocado.