Folia Horticulturae

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The effect of various lengths of P2 interstem on the growth, yielding, and health of two apple cultivars (‘Gloster,’ and ‘Melrose’)

Alojzy Czynczyk

Research Institute of Pomology and Floriculture
Pomologiczna 18, 96-100 Skierniewice, Poland
e-mail: aczynczy@insad.pl

The effect of 20 to 30 cm lengths of P2 interstem on Antonovka seedlings and trees produced in containers on the growth, cropping, and health of two apple-tree cultivars, ‘Gloster’ and ‘Melrose’, was studied. The results from the eleven-year period indicate that the use of P2 interstems, ranging in length from 20 to 30 cm, caused a significant reduction in growth in comparison with trees growing on the P2 rootstock. The longer the interstem, the smaller were the tree crowns obtained. The strong reduction in growth of the two vigorously growing cultivars resulted in an increase in fertility of the studied cultivars in comparison with trees on P2. Trees with the 30 cm long P2 interstem which had been produced in containers, had the highest fertility. The P2 interstem had a particularly beneficial effect on the fertility of the ‘Melrose’ considered as poorly cropping. The length of the P2 interstem, from 20 to 30 cm, did not significantly affect the size, weight, and colouring of fruit. Placing half of the length of P2 interstems in the soil was conducive to their developing roots in about 60% of the trees.

Czynczyk A., 2002. The effect of various lengths of P2 interstem on the growth, yielding, and health of two apple cultivars ‘Gloster’ and ‘Melrose’. Folia Horticulturae 14/2: 201-209.