kvalitet

Uticaj hranljive podloge i temperature na razvoj Apiognomonia veneta 37
The optimum temperatures for colonies growth as well as for fructification
of the anamorph of the fungus studied were 20° and 25°C (Tables 3 and 4).
At 15°C colonies developed but fructification was absent while at 10°C
colonies growth and conidia formation were depending on isolates in questin
because Pl-61 one don't produce them (Tables 3 and 4).
At 5°C colonies growth and fruiting bodies formation were weak but conidia
production were absent.
This also may be explane by differences beetwen plane trees tissue and
substances content in nutrient agar.
However, this data more or less are in accordance with environmental
condition in nature because Cellerino and Anselmi (1978) emphasizes the
temperature ranges from 9°-12°C needs for first buds infections at the sprouting
in spring spreading on young shoots as long as the temperature does not excesed
14°-16°C.
The infections keep on developing on leaves until the average temperature
reaches 18°-20°C and sometimes during the whole spring or further on.
According to these authors the host susceptibility depends on the species of
sycamore are in questin, on the individual plant and physiological conditions of
the plants, on the age of leaves (5-20 days old being most susceptible) and on the
inoculum preasures of the pathogen.
Therefore, conidiomata and conidia production at relativelly higher
temperatures in-vitro it could not be so suprising. Because, the temperature
conditions for plane tissues infections and mycelium growth in the host tissue
represents one question and another is: which temperatures enables the pathogen
fructification in nature ?
At the end different behavior of our four strains of the fungus Apiognomonia
veneta investigated on nutrient media and at the various temperature conditions
indicate on heterogeneous pathogen population which in nature probably exist
(Table 1-4).
Key words: Apiognomonia veneta, plane trees, isolates, nutrient media,
temperature, anamorph, teleomorph, fruiting bodies, conidia.
(Received: 05.02.2007.)
(Accepted: 08.08.2007.)
Plant Protection: Vol. 55 (1-4), No 247-250, 27-37, 2004, Belgrade