L.B. Orlikowski, Cz. Skrzypczak
The science of biological control began 100 years ago when the vedalia beetle was introduced in California from Australia to control the cottony cushion scale which was then devastating the fledgling citrus industry (Nelson, 1989).

During the last 30 years there has been a great interest in and study of biological control of plant pathogens in soil and on leaves and flowers. The term biological control as defined by Garrett (1965), involves reduction in disease through the agency of one or more living organism other than host or man. In most instances the environment is altered to favor the effect of living organism on the system host-parasite.

The general principles of biocontrol has centred on decrease or elimination of soil-borne pathogens. They are now seen as the main limitation of crop production (Cook and Rovira, 1976). One reason for the current interest in biological control is that there is pressure from the general public and bodies concerned about the environment for a reduction in the use of chemical pesticides. Biocontrol is perceived as being environmentally less damaging than pesticides.

There are very few inoculants commercially available at present for soil-borne diseases. They apparently work by production of siderophores, antibiotics or possibly lytic enzymes or by competition with the pathogen for nutrient requirements.

In this elaboration a number of examples of biological control of ornamental bulbous plant diseases will be reviewed.

Orlikowski, L.B. and Skrzypczak, Cz. (1992). BIOLOGICAL CONTROL OF PATHOGENS ON ORNAMENTAL BULB PLANTS. Acta Hortic. 325, 763-768
DOI: 10.17660/ActaHortic.1992.325.112

Acta Horticulturae