Downy mildews on ornamental plants and their control.
Among downy mildews occurring on ornamentals in Poland the most dangerous are downy mildew of rose and downy mildew of German statice (Tartarian statice). Downy mildew of rose caused by Peronospora sparsa Berk. is a serious threat to commercial cultivation of cut roses, especially grown under plastic tunnels. Peronospora statices Lobik casual agent of German statice downy mildew can causes the total losses in the second year of statice cultivation more than 70%. Both pathogens are very difficult to control. Effectiveness of azoxystrobine, cymoxanil + famoxate, mancozeb, phosethyl aluminium, phosethyl aluminium + fenamidone, propamocarb in the control of P. sparsa and P. statices was presented. In the control of statice downy mildew none of tested compounds was able to control satisfactory the pathogen. Relatively the best results were obtained with mixture of fenamidone (88 microg/cm3) and phosethyl AL (1334 microg/cm3). In the control of rose downy mildew, the best results were obtained with phosethyl Al at concentration 1600 microg/cm3.
Skrzypczak
C
C
Res. Institute of Pomology and Floriculture, PL-96-100 Skierniewice. czskrzyp@insad.pl
D005659:Fungicides, Industrial / Q000627:therapeutic use*; D005858:Germany; D009868:Oomycetes / Q000472:pathogenicity*; D010935:Plant Diseases / Q000706:statistics & numerical data*; D010944:Plants / Q000382:microbiology*; D011044:Poland; D027826:Rosa / Q000382:microbiology
D005659:Fungicides, Industrial