GROWTH AND YIELD OF PEAR VARIETIES ON ROOTSTOCK QUINCE "A" WITH DIFFERENT INTERSTOCKS

In the new intensive orchards with high density pears are grown on quince rootstock. But a great number of best varieties showed marked incompatibility with quince and the question of their choice cannot be taken into consideration without judging suitable interstocks.

At first the principal attention was given to the choice of compatible interstocks with quince (Pieri 1938, Grubb 1939, Van Cauwenberghe 1959), then to methods of double-working pears at budding time (Garner 1952, Nicolin 1953) and causes of defect in the union between pear and quince (Hatton 1928, Garner 1944, Gur 1957, Mosse and Scaramuzzi 1956, Pasnett and Cropley 1962).

Afterwards suitability of combinations between varieties and interstocks was examinated, with reference to the effects of interstocks on the growth, yield of varieties, fruit quality, the beginning of bearing, then resistance to frost injury (Gliha 1956, Cordy 1962, Hilkenbäumer 1962, Bazzochi and Rust 1967, Bosi et al. 1969, Sansavini and Bosi 1969, Monin 1974, Waligora 1974).

Till now investigations have solved many problems, emphasized new questions which have to be studied. This subject, because of its complexity and actuality, draws attention of many pomologists in the countries where pear growing is expanded. As a matter of fact, in literature we found mostly results of partial or fragmentary researches of this important problem. Therefore it is possible to find vagueness and different opinions on the effect of the interstocks on pear varieties.

Since in the semi-arid region of Croatia exist great possibilities for modern pear growing on the brown soils on loess, the establishment of great orchards is planned. To contribute to the better solving of the problem of intensive pear growing several experimental orchards were raised. In this short work the results of the growth and yield of pear varieties, till the end of their eighth year in one experimental orchard, are presented.

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