Juglans ailantifolia as a material for snow tires (studless tires). The only significant disease Japanese walnuts are susceptible to is the Walnut Bunch Disease. Juglans ailantifolia Juglans ailantifolia (synonyms "J. cordiformis" and "J. sieboldiana" and "J. mandshurica" var. "sachalinensis"), the Japanese walnut ( "oni-gurumi"), is a species of walnut native to Japan and Sakhalin. It is a deciduous tree growing to tall, rarely , and 40–80 cm stem diameter, with light grey bark. The leaves are pinnate, 50–90 cm long, with 11-17 leaflets, each leaflet 7–16 cm long and 3–5 cm broad. The whole leaf is downy-pubescent, and a somewhat brighter, yellower
Fruit anatomy the inner part of the peel and is commonly removed before eating. In citron fruit, where the mesocarp is the most prominent part, it is used to produce succade. Endocarp (from Greek: "endo-", "inside" + "-carp", "fruit") is a botanical term for the inside layer of the pericarp (or fruit), which directly surrounds the seeds. It may be membranous as in citrus where it is the only part consumed, or thick and hard as in the stone fruits of the family Rosaceae such as peaches, cherries, plums, and apricots. In nuts, it is the stony layer that surrounds the kernel