The vector of Grapevine Flavescens Dorée phytoplasma, the American grapevine leafhopper (Scaphoideus titanus) has been in Europe since 1924. In Romania, the first populations were detected in 2009 in the central, eastern and southern part of the country. Later, the leafhopper was found also in West Romania in 2014. In 2015 and 2017, altogether..., 14 sampling sites were studied in two vine regions of this area. The Scaphoideus titanus could be detected in 10 of them with relatively small abundances. During the studies, the yellow sticky traps proved more effective methods than sweep netting. To prevent vineyards from disease, we should do everything against the vector from prevention to chemical protection.
By the decreasing tendency of the fossil energy resources more emphasis put on the usage of renewable energy resources. The consideration of environmental protection and the efforts of the European Union make current the widespread usage of renewable energy within biomass energy. One of the determinative trends of biomass energy is the direct c...ombustion of biomass. Characteristically woody stocks are produced for this aim, but there is a considerable potential in several byproducts of growing herbaceous plants or of other processes.
In our study three byproducts of plant production have been investigated which appeared at the harvest. The Higher Heating Values of wheat, maize and sunflower byproducts have been determined by an IKA C2000 Basic adiabatic calorimeter. According to the statistical analysis of the measured data the HHV of the byproducts are different, and these values are in a negative correlation with the amount of ash in % (R2=0.873) appeared by the combustion.
Red oak (Quercus rubra L.) is our most important exotic oak species, that possesses growing culture with almost one hundred years in our country. Plantation character of red oak growing predominates principally by applied regeneration method (mostly artificial), regular planting space, applying defined method and planting space regulation syste...m. Forest tending model for red oak, that considered stopgap in the native literature is intended to serving the latter. Especially important equation in the viewpoint of stand growing, that describes relationship of stem number (N, in hectare) and diameter at breast height (D1.3 in cm) is: N=e9.80220-1.12607lnD1.3.
In Hungary black walnut (Juglans nigra L.) is one of the most valuable exotic tree species, mainly because of its excessively liked wood for furniture industry, that has fine tissue and singular colour. Generally it is established by seeding, it can be regenerated by coopice shoot well, but not by seeding in natural way. Black walnut crops regu...rarly from the age of 25–30 years and its rotation age is 75–85 years. Prosperous decorative shape of stem allows its using in tree plantings out of forests, too. In the future its role can increase mainly on good.
Game damage is an important problem in home wildlife management, because game managers pay more and more money for game damage year by year. Crop fields can do an appreciable part in reduction of game damages. The aim of the research is to survey the situation of domestic game damage and wildlife forage ground management. (Which are the most us...ed plants on crop fields, how current are the using of seed mixtures, which are the most typical game damages, as well as which are the most applied game control methods?)
It can be stated that the number of plant species sown on crop fields is quite low. Mostly corn and alfalfa are raised, though besides those many other plants are suitable to grow on crop fields. Rising value of game damage and big proportion of the agricultural game damage are well traceable from the questionnaires, too.
...5); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">One of the most important method of habitat development is wildlife forage ground management. Many plant species can be grown on the crop fields, as mixture, too. Use of seed mixtures has not been spread on the native wildlife forage ground, however there are many advantages of them.
The first European appearance of american grapevine leafhopper (Scaphoideus titanus), which is the vector of Grapevine Flavescence Dorée phytoplasma (‘Ca. Phytoplasma vitis’), were detected in France in 1924. The leafhopper has been distributed since 2006 in Hungary and now it occurs in the whole country, while the first record of the phyt...oplasma was published in 2013.
We studied the distribution of the leafhopper in surroundings of Nagyvárad (Oradea, West Romania) in 2015 and surroundings of Debrecen (East Hungary) in 2016. During the studies 17 sites were sampled. The leafhoppers were found in six Romanian places with relatively low abundances while it occurs in all studied Hungarian sites and two of them showed extremely high frequenncy.