Nursery disease problems - Containerized nurseries
The same organisms that cause disease of conifer seedlings grown in the traditional way in ground beds cause disease in containerized seedlings. However, there are differences in importance. As an example, Macrophomina phaseolina, a soilborne fungus, is not apt to be a problem in containerized seedlings since one of the requirements for pathogenicity is low soil moisture coupled with high temperatures. For convenience and for practical purposes diseases of seedlings ,,in be divided into those that attack aboveground parts (foliage and stem) and those that attack belowground parts (roots). Above ground diseases of containerized seedlings might be the same as chose grown in ground beds in the open since airborne pathogens e not restricted by overhead structures such as roofs of plastic or glass. In an ideal containerized greenhouse the humidity is controlled and theoretically condensation of moisture can be prevented and thereby the known airborne pathogens of conifers can be prevented from infecting. This degree of humidity control has been achieved through heating, venting and air circulation in greenhouses where chrysanthemums and roses are grown. These types of greenhouses are expensive and require considerable energy for operation. Most of the containerized nurseries that I have seen have not had the environmental controls necessary to prevent by airborne pathogens.
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Author(s): Arthur H. McCain
Publication: National Nursery Proceedings - 1978
Event:
Nurseryman's conference and seed processing workshop
1978 - Eureka, CA
