Kasprzyk Winicjusz, Baranowska Marlena, Korzeniewicz Robert, Behnke-Borowczyk Jolanta, Kowalkowski Wojciech
The State Forests National Forest Holding, Forest District Jawor, Myśliborska 3 Str., 59-400 Jawor, Poland.
Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, Wojska Polskiego 28 Str., 60-637 Poznań, Poland.
Plants (Basel). 2022 May 5;11(9):1248. doi: 10.3390/plants11091248.
The sessile oak is one of the most significant forest tree species in Europe. This species is vulnerable to various stresses, among which drought and powdery mildew have been the most serious threats. The aim of this study was to determine the influence of irrigation levels (overhead sprinklers) on the damage caused by powdery mildew to growing in a nursery setting. Four irrigation rates were used: 100%, 75%, 50% and 25% of the full rate. The area of the leaves was measured and the ratio between the dry mass of the roots and the dry mass of the entire plant was calculated after the growing season in years' 2015 and 2016. Limiting the total amount of water provided to a level between 53.6 mm × m and 83.6 mm × m, particularly in the months when total precipitation was low (VII and VIII 2015), a supplemental irrigation rate between 3 and 9 mm × m resulted in a lower severity of oak powdery mildew on leaves and lead to a favorable allocation of the biomass of the sessile oak seedlings to the root system. The severity of infection on oak leaf blades was lower when irrigation rates were reduced. The greatest mean degree of infestation in 2015 was noted in the 100% irrigation rate (14.6%), 75% (6.25%), 50% (4.35%) and 25% (5.47%). In 2016, there was no significant difference between the mean area of leaves infected by powdery mildew depending on the applied irrigation rate. The shoot-root biomass rate showed greater variation under limited irrigation rates. Controlling the irrigation rate can become an effective component of integrated protection strategies against this pathogen.
无梗花栎是欧洲最重要的森林树种之一。该物种易受多种胁迫，其中干旱和白粉病是最严重的威胁。本研究的目的是确定灌溉水平（顶喷）对苗圃环境中生长的无梗花栎受白粉病损害的影响。使用了四种灌溉率：全率的100%、75%、50%和25%。在2015年和2016年生长季节结束后，测量了叶片面积，并计算了根干重与整株植物干重的比率。将提供的总水量限制在53.6毫米×米至83.6毫米×米之间，特别是在总降水量较低的月份（2015年7月和8月），3至9毫米×米的补充灌溉率导致叶片上橡树白粉病的严重程度降低，并使无梗花栎幼苗的生物量向根系进行有利分配。当灌溉率降低时，橡树叶片上的感染严重程度较低。2015年，在100%灌溉率（14.6%）、75%（6.25%）、50%（4.35%）和25%（5.47%）下观察到最大平均侵染程度。2016年，根据所应用的灌溉率，受白粉病感染的叶片平均面积之间没有显著差异。在有限的灌溉率下，地上部与根部生物量比率显示出更大的变化。控制灌溉率可以成为针对这种病原体的综合保护策略的有效组成部分。
