Propagation of walnuts by summer inoculation

S. Khokhlov, V. Baskakova, E. Panyushkina, V. Melnikov
The results of many years of research on the reproduction of walnut cultivars from the Nikita Botanical Garden in the open ground of the natural and climatic conditions of the steppe zone of the Crimea are summarized. During this experiment, two types of vaccinations were used: patch and shield. Rootstocks were biennial seedlings from two species of the family Juglandaceae (Juglans regia L. and Juglans nigra L.). A higher degree of survival was achieved with the use of the patch (51.6%) which was slightly less with the shield (49.0%). A similar relationship was obtained with characteristics of callus formation and graft growth. The highest survival rate of budding is characteristic for the ‘Konkursny’, ‘Pamyaty Pasenkova’, ‘Pozdnotsvetushchy’, and ‘Skabery’ cultivars (63.4-71.2%). The highest amplitude of oscillations in this indicator was among the cultivars ‘Arkad’ (17.0-69.2%) and ‘Generalsky’ (33.2-82.0%). The lowest survival rate was recorded in 2012 and 2014, which was characterized by abnormal dry and hot weather in June and July. The air temperature in these months was consistently high, and the maximum values often exceeded +30°C. The amount of precipitation during this period did not exceed 5 mm. The obtained data allow us to conclude that for most walnut cultivars, the survival rate of the bud on the rootstocks of Juglans nigra L. is slightly lower than that of the seedlings of Juglans regia L. (1.4-6.8%). The best survival rate in seedlings of Juglans nigra L. was noted in the ‘Burlyuk’ cultivar. In Crimea, the most favourable period for walnut propagation in the field is the period from the end of May to the end of the first half of August.
Khokhlov, S., Baskakova, V., Panyushkina, E. and Melnikov, V. (2021). Propagation of walnuts by summer inoculation. Acta Hortic. 1315, 11-14
DOI: 10.17660/ActaHortic.2021.1315.2
walnut, cultivar, rootstock, budding, survival

Acta Horticulturae