Juglans regia L.
A deciduous, nut tree with golf ball sized, hard shelled nuts.
Fruit:A hard shelled nut.
Perennial tree. Trees are shaken or nuts knocked down when ripe then dried and usually bleached before sale.
Physiology:Sensitive to early spring frost.
Sensitive to heat scald in summer.
Long chilling requirement.
Seed Biology and Germination:
Prefers cross pollination. Catkin bearing trees are wind pollinated.
Population Dynamics and Dispersal:
Spread mainly by intentional planting.
Usually grafted to a rootstock.
Origin and History:South east Europe to China. Between Iran and the Himalayas.
Imported as a nut crop.
Distribution:ACT, NSW, SA, TAS, VIC, WA.
Courtesy Australia's Virtual Herbarium.
Temperate. Mediterranean. Cool temperate.
Requires more than 760 mm rainfall annually or irrigation.
Soil:Deep, friable well drained soils.
Prefers soils with high organic matter.
Often grown in river valleys.
Not recorded as toxic.
Management and Control:Thresholds:
Herbicide resistance:Biological Control:
Pests include Codling Moth, Erinose Mite, Birds and Rabbits.
Diseases include Bacterial Blight, Phytophthora root rot and Armillariella root rot.
Related plants:Black Walnut (Juglans nigra)
Plants of similar appearance:References:
Lazarides, M. and Hince, B. (1993). CSIRO handbook of economic plants of Australia. (CSIRO, Melbourne). #702.2.
Reid, R.L. (1990) The Manual of Australian Agriculture. (Butterworths, Sydney). P192.
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