Possibilities of using chemical agents for the protection of Gerbera jamesonii against Phytophthora cryptogea

The objective of the study was to develop effective chemical methods of protection of Gerbera jamesonii against Phytophthora cryptogea with consideration of the way of their application. In laboratory conditions, the activity of 7 tested agents was evaluated based on growth of P. cryptogea on a medium containing fungicides, and size of necrosis in inoculated gerbera leaf blades. In greenhouse tests, growth of plants in infected substrate was assessed. The study showed variable susceptibility of Phytophthora cryptogea to the tested plant protection products. The best solution protecting gerbera crops against P. cryptogea turned out to be Ridomil Gold MZ Pepite 68 WG. In programs of gerbera protection against Phytophtora, the agent should be introduced by means of watering. Products such as Acrobat MZ 69 WG, Infinito 687.5 SC, and Mildex 711.9 WG can be considered an element of integrated protection of gerbera.