The Sudanese citrus industry is mainly based on oldline cultivars of grapefruit, sweet orange and willow leaf mandarin, grafted almost exclusively on sour orange. Infection with graft-transmissible agents, viroids in particular, may have deleterious effects on the productivity of these citrus species and, more importantly, limits the choice of rootstocks should sour orange be replaced by altern...

Small-sized peach (Prunus persica [L.] Batsch.) trees for commercial fruit production have not been available due to the lack of suitable dwarfing rootstocks that have a wide range of compatibility among cultivars. Effects of partial girdling and trunk heating on the growth, yield, and fruit quality of peach were studied. A 4 cm wide partial ring of bark was removed at a height of 25 cm from th...

Accurate water and fertilizer management are essential in modern high intensity orchard systems to enable the manipulation of both reproductive and vegetative development. Studies have been conducted to establish the annual plant fertilization requirements, of several tree crops but there exists little information regarding the requirements of pear trees on rootstocks of differing vigour. Niney...