TY - JOUR N2 - The objective of the study was to determine the effect of leaf wetness period and air temperature on development of disease symptoms caused by Puccinia recondita on winter wheat. The experiments were carried out in growth chamber at the Institute of Plant Protection in Poznań. Seedlings of a susceptible winter wheat cultivar Mikon, were artificially inoculated with urediniospores of P. recondita and incubated in temperature of 15 and 20°C. The period of duration of leaf wetness varied from 2 to 14 hours. Disease symptoms on seedlings at 20°C appeared 7 days after inoculation. Reduction of temperature to 15°C resulted in the elongation of latency period to 8 days. The relationship between leaf wetness period and disease symptoms severity was also observed. The gratest number of urediniospores in both tested temperatures were observed on plants exposed to 14 hours of leaf wetness. In temperature of 20°C 4 hours of wetness duration was enough to guarantee infection and the appearance of P. recondita pustules, whereas in 15°C at least 10 hours of wet period was needed to cause disease symptoms development. The experimental results were used to produce two equations describing relation between leaf wetness and symptoms development in tested temperatures. L1 - http://journals.pan.pl/Content/118466/PDF/161-166_Effect%20of%20environmental.pdf L2 - http://journals.pan.pl/Content/118466 PY - 2007 IS - No 2 EP - 166 KW - Puccinia recondita KW - winter wheat KW - leaf wetness KW - temperature A1 - Wójtowicz, Andrzej PB - Committee of Plant Protection PAS PB - Institute of Plant Protection – National Research Institute VL - vol. 47 DA - 06.06.2007 T1 - Effect of environmental conditions on the development of disease symptoms caused by Puccinia recondita on winter wheat seedlings SP - 161 UR - http://journals.pan.pl/dlibra/publication/edition/118466 T2 - Journal of Plant Protection Research ER -