Among 18 diseases detected in 1973, Graphium [Ceratocystis] ulmi [on elm] is the most important.

Endothia parasitica is widespread mainly in W. Georgia and Dutch elm disease [Ceratocystis ulmi] occurs on elm everywhere.

In calm weather nearly all the pollen produced by Oak remains within the stand, and only in exceptional cases with strong winds is Oak pollen carried for long distances. In rainy weather the Oak pollen does not remain in the air. In the favourable weather the stigma receives on average 11.4-13.1...

P. eldarica had 18 chromosomes with equal and 6 with unequal arms, while P. pinea and P. pallasiana both had 14 with equal and 10 with unequal arms and both had satellites.l.

Batches of 2 + 0 plants of Larix decidua were lined out at monthly intervals from April to Oct. in a nursery at 700 m. alt. in Austria. The growth of terminal and lateral shoots, annual rings and roots was compared with that of undisturbed controls thinned to transplant spacing. Height increment...

Stimulating doses of gamma-rays and a low-frequency magnetic field were determined for seeds of both species. Treatment in a low-frequency magnetic field (10 kc/s for 30 min) was beneficial. KEYWORDS: Pinus eldarica \ Pinus pithyusa \ seeds \ seeds \ treatment irradiation

Describes investigations on 15 species in Soviet Georgia in 1961 and 1962. Cambial activity of ring-porous species started 2-3 days earlier than height growth, whereas in diffuse-porous species it started 10-15 days later than height growth. The duration of cambial activity decreased with...

An account is given of experiments carried out at Tbilissi in order to establish any differences that may exist between heteroauxins of American and Soviet manufacture, the latter prepared at the biochemical laboratory of the Sukhumi nursery. The two types of heteroauxins proved roughly equivalent; ...

Symptoms caused by Pseudomonas [syringae pv.] mori in W. Georgia included colourless rings on the stem and twigs of seedlings, becoming dark brown and surrounded by a tumour-like thickening. Growth of infected seedlings was retarded. At the infection sites there was complete necrosis and...