Abstract:
Introduction. In the Republic of
Moldova, spring frosts persist until the
end of april, but in some years it is
reported until mid-may. These directly
influence the growth and development
of plants.
Material and methods. Blackberry plants, of the
Arapaho and Triple Crown varieties cultivated
within the Scientific-Practical Center in the Field of
Medicinal Plants (SPCFMP). The rows of semishrubs are located from N to S on the level curves,
the planting distance is 3 x 1.5 m.
Results. The stress caused by the late frosts, in full vegetation,
caused a stagnation in the development of some varieties. Thus,
in the bud opening phase, a decrease in the number of flowering
shoots in the proportion of Arapaho was observed in the
proportion of 30%. As a result, the harvest and the quality of the
fruit decreased considerably.
While in the Triple Crown variety, which has a high growth force,
even if in the phase of opening the swelling and opening of the
buds were affected by frost, they formed healthy flowering
shoots, of normal size, and in the place where the main buds
froze, the development from the secondary buds of 2 flowering
shoots was observed.
Conclusions. The biological characteristics of the
variety directly influence the resistance of blackberry
plants to late spring frosts. Thus, for the early erectgrowing variety Arapaho, low temperatures are
critical, while the semi-erect Triple Crown variety has
shown increased resistance.
