IDENTIFICATION OF DISEASE REACTION OF 11 CAMELINA SATIVA GENOTYPES TO DOWNY MILDEW (PERONOSPORA PARASITICA) AND INVESTIGATION OF STRATEGIES FOR ITS CONTROL

Abstract

The SEM observation revealed that Peronospora parasitica started to germinate and finish direct penetration between 4 hours and 8 hours after inoculation. Conidiophores were observed growing out through stomata 1 week after inoculation. Eleven camelina (Camelina sativa) genotypes were evaluated for their disease reaction to three downy mildew isolates obtained from Truro, NS; Charlottetown, PEI; and Canning, NS. The results showed that CN30478 was the most resistant genotype and CN30475 was the second most resistant. Calena and CN101985 were the most susceptible genotypes. Dithane DG, Bravo 500, Tanos 50 DF and Tattoo C were tested to identify their efficacy for downy mildew control of a single application on four camelina genotypes. In controlled environment experiments, the fungicides were applied either one day before or one week after inoculation. Both the field and growth chamber experiments failed to show any significant effects of these fungicides on downy mildew severity.