POTENTIAL USE OF ATPOLAN 80 EC FOR PROTECTING SOME SPECIES OF ORNAMENTAL PLANTS AGAINST DISEASES
Keywords:
Sphaerotheca pannosa var. rosae, Diplocarpon rosae, Puccinia horiana, mineral oils, control, Atpolan 80 ECAbstract
The study was an evaluation of the efficacy of Atpolan 80 EC (76% mineral oil SN) in the protection of ornamental plants against some pathogens – the causal agents of powdery mildew, leaf spot and rust. Depending on the target pathogen, Atpolan 80 EC was used at concentrations from 0.5 to 2% in spray treatments carried out 4 to 9 times at 7-day intervals.
At each of the test concentrations, Atpolan 80 EC, used as a curative treatment of roses, significantly inhibited the development of the pathogens responsible for powdery mildew and black spot. In the control of powdery mildew (Sphaerotheca pannosa var. rosae), Atpolan 80 EC sprayed on some rose varieties 4 times at 0.5 and 0.75% showed an efficacy of 96% and 98%, respectively, while at higher concentrations completely inhibited the development of disease symptoms. Its efficacy was from 74.4 to 100%, depending on the concentration, in the protection of Rosa canina ‘Fenders’, a rootstock for roses. When used as a remedy to control black spot (Diplocarpon rosae), its efficacy after 6 spray treatments was from 31.5% to 85.1%, depending on the concentration used and the susceptibility of the rose variety to the pathogen. However, after 9 treatments its effectiveness was found to decrease. When used curatively on chrysanthemums, Atpolan 80 EC significantly inhibited the development of symptoms of white rust caused by Puccinia horiana. After spraying chrysanthemum plants 4 times with the oil at a concentration of 2% there was a 2.5 times reduction in the number of telia forming per leaf, and, depending on the concentration, it caused 16.6 to 100% of telia to disintegrate. There was no evidence of phytotoxicity of Atpolan 80 EC towards the plant species and varieties tested.
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