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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Faktory ovlivňující obnovu lesa na požářišti u Bzence (LS Strážnice)
 Jarošová, Veronika
The aim of this bachelor thesis was to determine the current status of the population of beetle maďalového in the area of fire residues in the forest governance of Bzenec Strážnice and its surroundings. A fire broke out at the end of May 2012 and damaged the area of almost 165 ha of forest. First instar grubs, which were present in soil of burnt vegetation at the time, were not hit by the fire, and then these grubs caused enormous loss of spring planting in 2013. The soil of fire residues was tested with various methods of soil preparation, which would lead to reduction of the amount of beetle grubs maďalového. Out of these methods, the method of soil preparation with milling cutter with depth effect was the most effective one. Application of FORCE 1,5g insecticide had positive effect on the survival of planted seedlings. The dispersion of grubs, in the stand depending on the distance from the tree trunk and the amount of grubs depending on the age of original vegetation, had been investigated. The results showed that the grubs do not have a single concentration but are scattered along the stand depending on the root system, and they were mostly present in the stands of the second class.
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Ochrana lesa před chroustem maďalovým v gradačním území Moravské Sahary
 Jarošová, Veronika
The aim of this master´s thesis was the evaluation of options that should lead to the elimination of the harmful effects of the white grubs of Melolontha hippocastani to the gradational area of Moravian Sahara (part of forest maintenance LS Stážnice, the Bzenec district). The effectiveness of chosen preparations (Force 1,5 G and Actara 25 WP) on the white grubs of Melolontha hippocastani was observed and conducted under controlled conditions in the ´container experiment´ with 380 seedlings of Pinus sylvestris. This experiment was repeatedly conducted five times over a period of 3 years. The results show that the most effective preparation against the white grubs is Actara 25 WG (200 up to 400 g/ha/600 l water) in the form of watering. This preparation in the form of spraying was ineffective. Inconsistent results were reached with the preparation Force 1,5 G. At the same time, the vertical movements of white grubs during their development stages in the soil were being observed over the period of 2015–2018. This observation took place in the drill holes of the following proportions 50 x 50 x 60–140 cm. The results confirmed that the depth of wintering of the white grubs and their movements during their vegetative state depends on the soil´s temperature and moisture, and the available sources of food to the current instar of the white grub.
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