This experiment was designed to examine the tolerance of fruit trees to flooding by different cultivars, stocks, and fruit species which were grown and tested in the pot under vinyl house for 3 years from 1985 to 1987. The results are as follows:
1. Among apple rootstocks, Malus sieboldii showed highest flooding tolerance followed by Malus baccata, seedlings of `Fuji´ apple, M.26, and MM.106 in the order. M. sieboldii and M. baccata were more tolerant in flooding than dwarf rootstocks M.26, and MM.106.
2. Among apple scion cultivars grafted on seedlings of M. sieboldii, `Jonathan´ and `Tsugaru´ were more tolerant in flooding than `Mutsu´, `Fuji´, `Starking Delicious´, and `Jonagold´ with little difference among the latter four cultivars.
3. Among pear rootstocks, flooding tolerance of Pyrus pyrifolia and P. fauriei were significantly greater than that of `Imamuraaki´ cultivar seedlings.
4. Among Prunus species, P. japonica was the most tolerant to flooding and followed by P. salicina and P. tomentosa. No noticeable difference was exhibited among seedlings of peaches, apricots, and Japanese apricots.
5. Among peach cuttings, `Okubo´ led the others in flooding tolerance, with `Sunagowase´, `Hakuho´, `Yumyung´, `Hakuto´, `Kurakata-wase´, and `Suho´ followed in the order.
6. Among cultivars and rootstock of Prunus combined, wild peaches were greater than apricot among rootstocks in flooding tolerance, while `Yumyung´ showed a slower injury development than `Kurakata-wase´ in scion cultivars.
7. Among grape cultivars, `Tano Red´, `Himrod seedless´, `Sheridan´, `Dutchess´, and `Delaware´ were comparatively more tolerant than `Schuyler´, `Campbell Early´, `Kyoho´, and `Seibel 9110´ among scion cultivars, while Vialla. SO4, 101-14, 4010-Cl, and 196-C1 were relatively more tolerant than 34EM, 99R, 3306, 1447P, 44-5319, and 1616 among rootstocks.
8. With regard to different fruit species, grape was generally the most tolerant to flooding, followed by pear, apple, and Prunus species. Within species, the most tolerant ones were P. pyrifolia and P. fauriei in pears, M. sieboldii and M. baccata in apples.
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