Glasnik Šumarskog Fakulteta: Univerzitet u Beogradu (Jan 2013)
Height growth characteristics of one-year-old pedunculate oaks on regeneration areas with and without fungicide protection against oak powdery mildew (Microsphaera alphitoides Griff. et Maubl.)
Abstract
Height growth characteristics of one-year-old pedunculate oaks were studied during three calendar years on comparative regeneration areas both with and without fungicide protection against oak powdery mildew (Microsphaera alphitoides Griff. et Maubl.). Three fungicides were used for the chemical protection of one-year-old pedunculate oaks: Microthiol special, Stroby DF and Anvil. The experiments were located in different site and stand conditions, and the growing seasons in which pedunculate oak seedlings were established were characterized by different precipitation sums and higher air temperatures when compared to multiannual average. The study sample included 1126 plants, and their shoot lengths were measured at the end of the growing season. In the analyzed sample, the second growth stage was recorded on 92.3%-100% of the treated plants and on 69.5%-100% of the untreated plants, the third growth stage was recorded on 52.6%-87% of the treated plants and on 42.1%-82% of the untreated plants, and the fourth growth stage was observed on 0%-37% of the treated plants and on 1.1-29% of the untreated plants. In the analyzed sample, the mean heights of one-year-old pedun-culate oaks were greater on the areas with fungicide protection, but the differences in the percentages of polycyclic growth and the differences in average lengths of individual flushes were not always statistically significant, when compared to the areas without protection, especially after the first stage. The study shows that the dominant effect on the percentage of the second, the third and the fourth stages and on their mean lengths was exerted by site and stand conditions, and that the effects of fungicide protection should be analyzed taking into account the polycyclism of pedunculate oak, i.e. the characteristics of polycyclic growth, which are the resultant of all the effects. In the studied conditions, the fifth stage of growth was recorded in five plants.
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