Ocena aktywności biologicznej mikroorganizmów owadzich przeciwko niektórym patogenom roślin

The objectives of this research were to determine the antagonistic activity of 8 insect microorganisms (isolated from eggs of some insect species) against phytopathogens: Pseudomonas lachrymans (Smith et Bryan) Carsner, Phoma betae Frank., Pythium sp. In the laboratory experiments the liquid cultures 2 and 3 completely inhibited the growth of Phoma betae mycelium from infected beet seeds. Under greenhouse conditions cultures 1, 2 and 3, used for cucumber seed treatment, effectively reduced the development of angular leaf spot caused by P. lachrymans. Their protective activity was comparable to the efficiency of synthetic bactericide - Bronopol. The liquid, living culture 3 and culture 2 - sterilized (devoid of living cells but including metabolic products of microorganisms) considerably protected cucumber seedlings from damping off caused by Pythium sp.