The effects of initiation timing of drought stress on the carbohydrate content and growth of Japanese apricot (Prunus mume Sieb. et Zucc.) 'Nanko' tree were investigated. Three-year-old trees were subjected to drought stress for three months in May ('Spring') and August ('Summer'), respectively. Irrigation was started immediately after drought stress treatment had finished. The starch concentration in the roots of stressed trees increased in both 'Spring' and 'Summer' two months after starting drought stress treatment and rapidly decreased just after starting irrigation in 'Spring'; however, it still temporarily increased in 'Summer'. These different results were attributed to seasonal changes in the carbohydrate demand. The dry matter weight of each tree organ in February of the following year was suppressed by drought stress, particularly in 'Spring'. This result indicates that, if a tree suffers drought stress in spring, vegetative growth is suppressed more seriously than in summer and tree growth, declined by suffering from severe and long-term drought stress, will hardly recover even the tree is reirrigated. The total starch in all organs of the drought-stressed trees in February of the following year was significantly less than that in well-irrigated trees. These results indicate that severe drought stress for three months inhibits not only current tree growth but also the accumulation of carbohydrates that is necessary for the following year's growth. Hence, irrigation to avoid a fatal growth decline due to severe drought stress is needed during the current growth stage, especially in the early growth stage in spring.

Effects of interstocks on the growth and fruit quality of 'Fuyu' Japanese persimmon (Diospyros kaki Thunb.) were investigated to select an effective dwarfing interstock of this species. The performance of four interstocks (Ac-1, Ac-2, Y clones, and a seedling of Diospyros rhombifolia) was evaluated in combination with 'Aogaki' (D. kaki) seedling rootstocks and 'Fuyu' scions over a six-year period. Ac-1 and Y interstocks moderately reduced the tree size without influencing yield efficiency (yield per unit of crown area). In contrast, Ac-2 and D. rhombifolia interstocks reduced both tree size and fruit yield (kg/tree), and many of these trees died within a few years after planting. Annual fluctuations and no consistent trends were observed in the fruit weight among control and interstock trees. These results show the possibility of dwarfing 'Fuyu' trees by using Ac-1 and Y as interstock.

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