Plant extracts in the control of Phytophthora cryptogea.
Grapefruit extract at dose 40 micrograms/cm3 inhibited Phytophtora cryptogea linear growth about 50% and almost completely suppressed zoosporangia formation. Drenching of gerbera plants with the extract at dose 165 micrograms/cm3 reduced population density of the pathogen about 70% and this high efficacy was noted at least one month after application. Treatment of gerberas with grapefruit extract resulted in protection of about 50% of plants against the pathogen. Biological activity of purple coneflower extract was lower than extract from grapefruit. Significant decrease of population density of the pathogen during the first 5 days and increase of gerbera healthy stand was observed, however, in peat treated with that extract.
Orlikowski
L B
LB
Research Institute of Pomology & Floriculture, Pomologiczna 18, 96-100 Skierniewice, Poland.
D000935:Antifungal Agents / Q000494:pharmacology*; D019659:Asteraceae / Q000382:microbiology*; D032083:Citrus paradisi / Q000737:chemistry*; D020900:Echinacea / Q000737:chemistry; D008826:Microbial Sensitivity Tests; D010838:Phytophthora / Q000187:drug effects / Q000254:growth & development*; D010936:Plant Extracts / Q000494:pharmacology*; D011156:Population Density
D000935:Antifungal Agents; D010936:Plant Extracts