Leaf rust (Puccinia dispersa Erikss.) infection on spring triticale (×Triticosecale Wittm.) and its control withdifferent types and doses of fungicides
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Lithuanian Institute of Agriculture Instituto al. 1, Akademija, Dotnuva, 5051 Kedainiai distr., Lithuania
Journal of Plant Protection Research 2004;44(1):47–56
Investigation of leaf rust disease on spring crops of triticale (× Triticosecale Wittm.), it sdi stribution dynamics, as well as the efficacy of two fungicides, different application doses and timing was carried out at the Lithuanian Institute of Agriculture during 2000–2002. Differences in the disease development were determined by the meteorological conditions, especially the amount of rainfall, and growth stage of plants. Precipitation during 2000 was close to the mean, and the development of leaf rust was moderate. In June of 2001 the rainfall was twice as high as the norm, which created favourable conditions for pathogen development. In 2002 a long droughty period till flowering inhibited the development of leaf rust. The triazole fungicides Juventus (metkonazole 60 g l –1 ) and triazole and strobilurine mixture. Allegro (kresoxim-methyl 125 g l –1 + epoxikonazole 125 g l –1 ) were used at full, two-third and half doses once and twice. Both of the fungicides were very effective against leaf rust. Biological efficacy of Juventus applied at any dose or time against leaf rust was 88.3%–99.7%. Allegro efficacy against this disease was slightly higher 94.7%–100%. Application of 1.0; 0.75 and 0.5 l ha –1 doses twice showed a better efficacy than a single application. The higher doses of fungicides were not markedly superior to the lower ones
The authors have declared that no conflict of interests exist.
Dalia Janusauskaite
Lithuanian Institute of Agriculture Instituto al. 1, Akademija, Dotnuva, 5051 Kedainiai distr., Lithuania
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