Behavior of two peach cultivars with 'Januaria' as a Japanese plum interstock

The effects of interstock with 'Januaria' Japanese plum (Prunus salicina L. ) were verified in the performance of peach (Prunus persica L.) cultivars T ropical and Ouromel-2. The basic rootstock used was 'Okinawa' peach. Two cr ops were evaluated at fourth and fifth leaves of plants established in 1994 . The interstock caused decrease of the vigour of the plants - perimeter an d cross-sectional area of the trunk, perimeter of the primary branches and length of the internodes - and increased fruit weight and production per pl ant, in comparison to the plant control without interstock budded on 'Okina wa'. Yield efficiency, fertility index, flowering and fruit set were increa sed with 'Januaria' interstock. This interstock process presents an adequat e characteristic of compatibility for the peach tree, as a form of compacti ng the plants, increasing the productivity and the fruit size.