375.
Very extensive production procedure, especially in plants growing under covering, require methods, which would allow quick elimination or substantial reduction of populations of specific pathogens without affecting the growth and development of the cultivated plants. Among soil-borne pathogens, the
Phytophthora species are especially dangerous for horticultural plants. In this study, irradiation with electron beam was applied to control
Phytophthora cinnamomi. The influence of irradiation dose on the reduction of
in vitro growth and the population density of the pathogen in treated peat and its mixture with composted pine bark (1:1), as well as the health of
Chamaecyparis lawsoniana and
Lavandula angustifolia plants were evaluated. Application of irradiation at a dose of 1.5 kGy completely inhibited the
in vitro development of
P. cinnamomi. This irradiation effect was connected with the disintegration of the hyphae and spores of the species. Irradiation of peat and its mixture with composted pine bark with 10 kGy resulted in the inhibition of stem base rot development in
Ch. lawsoniana. Symptoms of the disease were not observed when the substrates were treated with 15 kGy. In the case of
L. angustifolia, stem root rot was not observed on cuttings transplanted to infected peat irradiated at a dose of 10 kGy. Irradiation of the horticultural substrates did not affect plant growth.
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