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Articles by Elena NAGY
Total Records ( 2 ) for Elena NAGY
  Felicia MURESANU , Maria FENESAN , Elena NAGY , Dana MALSCHI and Adina IVAS
  Colorado potato beetle (Leptinotarsa decemlineata) is and will remain the main pest of potato crops. It seeks to combat it, more so as enable transmission of the virus X (PVC) and could reach total causing damage, in an attack early harvest losses are possible in 50 to 80% while a later attack, they can reach up to 30%. This pest developed resistance to a wide range of insecticides, which has enhance management studies determined based on a better and more thorough understanding of the ecology pest. In currently there are different methods based on biological products, various chemicals (pheromones) that causes certain behaviors (in this case aggregation) with efficiency superior, clean, reducing the quantities of toxic chemicals in the cultivation of potatoes, there is not resistance (as happens with insecticides), and thus do not affect consumer health tubers of potatoes. The paper presents results under the program Agral-CEEX from S.C.D.A. Turda during 2006-2008, regarding the use of unconventional biotechnics control or limitation under ETD (Economic Thresholds for Pest ) of the Colorado beetle (Leptinotarsa decemlineata Say.) from the potato crop. This method was tested based on the use of compositions biotechnics pest attraction that obtained at the Institute of Chemistry Cluj-Napoca, which were used as traps for beetle aggregation pheromone in Colorado; two variants were synthesized pheromone of aggregation, V1-PEG and V2 -ExFr. Adults to follow this pest abundance and attack rate (%) in each variant. Pitfalls of both V1-PEG, and in those of V2-ExFr were found near the Colorado beetle, many insects in the same order as proof that these aggregation pheromones are efficiency and can be placed in management integrated control, using this method to potato crop. Also using this method biotechnics -aggregation pheromone- to reduced chemical treatments needed to pest control and protect wildlife be helpful existing default.
  Elena NAGY , Laura TIGUDEAN , Alexandra SUCIU , Viorel FLORIAN and Dan Cristian NAGY
  Spring barley crops are damaged by numerous diseases but only a few caused quantitative and qualitative yield losses in every year, in Transylvania conditions. The complex of foliar diseases: powdery mildew (Blumeria graminis f. sp. hordei), scald (Rhynchosporium secalis), net blotch (Pyrenophora teres) and leaf blotch (Septoria passerini), leaf rust (Puccinia hordei) as well as head blight (Fusarium spp.) and barley yellow dwarf virus (BYDV) are the most frequently in spring barley crops. Yield losses reaching to 25% from yield value depend on climatic conditions and spring barley cultivar. The effect of fungicide foliar treatments on the four spring barley cultivars was studied at ARDS Turda during three years. It was organized bifactorial trials after block split type with 4 cultivars and 3 treatments variants: untreated (T0), 1 Treatment (T1) applied leaf flag emergence and 2 treatments (T2) applied leaf flag emergence and in the end of flowering. The fungicides used contain: spyroxamine 250g/l + tebuconazole 167g/l + triadimenole 43g/l at dose 0,6l/ha for the first treatment and for the second treatment contain: trifloxystrobin 100g/l+ tebuconazole 200g/l at dose 0,8g/l. In the field, attack degree for main diseases (%) and yield (kg/ha) were determined. In the laboratory, thousands kernels weight (TKW), volumetric weight (VW) and percentage of Fusarium diseased kernels were registered. The weather conditions from April, May, June months of 3 years is characterized by exceeded temperature in April and May months, associated with strong hydric deficit in April and very rainfall in May month, were not very favorable of the diseases occurrence, it know that is essentially weather- dependent. Foliar diseases: powdery mildew, net blotch, and leaf rust were presented in spring barley crops. By applying of one single fungicide treatment, attacked leaf area by foliar diseases was significantly reduced, in average, with 50% and quite more at Daciana and Jubileu cultivars. Applying of 2 treatments diminished substantially diseased leaf area (3,1 %) and percentage of Fusarium diseased kernels (2,0%). Applying one foliar treatment increases yield with 7,9 % and for two treatments with 18,2%, in average, in the three years, compared with untreated plots. Fungicidal foliar treatments have influenced positively TKW and VW, determining increases rich up to 17,5%, respectively up to 5,8%, statistic assured values. Tested fungicides such as theses contain: propiconazole 250g/l+ciproconazole 160g/l (0,5l/ha), azoxystrobin 200g/l + ciproconazole 80g/l (0,5l/ha) and prothioconazole 125g/l + tebuconazole125g/l (0,8 l/ha) and the others, presented a good efficacy in controlling spring barley foliar and ear diseases.
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