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Articles by Stanislav TRDAN
Total Records ( 2 ) for Stanislav TRDAN
  Stanislav Trdan , Matej Vidrih , Nevenka Valic and Ziga Laznik
  In 2005, preparations of four species of the entomopathogenic nematodes Steinernema feltiae, S. carpocapsae, Heterorhabditis bacteriophora, and H. megidis, were tested under laboratory conditions for their ability to kill adult flea beetles, Phyllotreta spp. (Coleoptera: Chrysomelidae). The nematode preparations were tested at doses of 200, 1000, and 2000 IJs per adult and at temperatures 15°C, 20°C, and 25°C. The numbers of beetles killed were recorded two, four, six, and eight days after treatment. The nematodes were more effective at 20°C and 25°C than at 15°C. At 20°C, the nematodes had killed between 44% (H. megidis at the lowest dose tested) and 77% (S. feltiae at the lowest dose tested) of the beetles eight days after treatment. At the two highest doses tested, the S. feltiae, S. carpocapsae, and H. bacteriophora preparations each killed at least 74% of the beetles at 25°C. Steinernema feltiae was the most effective nematode (LC50=483-1467 IJs/adult) and, as an alternative to chemical insecticides, appears to have the highest potential for controlling overwintered flea beetles (May) under field conditions. The nematodes S. feltiae, S. carpocapsae and H. bacteriophora would all be suitable for controlling adult flea beetles during warm summer months, when flea beetles occur in high numbers in Slovenia.
  Ziga LAZNIK , Dragan ZNIDARCIC and Stanislav TRDAN
  In a glasshouse experiment, the effectiveness of the entomopathogenic nematode (EPN) Steinernema feltiae (Filipjev) (Rhabditida: Steinernematidae) was compared with thiamethoxam for the control of adults of the greenhouse whitefly (GWF), Trialeurodes vaporariorum (Westwood) (Homoptera: Aleyrodidae), on slicer cucumbers. In a period from mid June to the end of August (2007 and 2008), cucumbers were grown in 4 different growth substrates: expanded perlite, expanded vermiculite, light expanded clay, and peat. A suspension of the nematode (2500 infective juveniles mL-1) was applied to cucumbers 5 times in 2007 and twice in 2008, whilst an insecticide thiametoxam at the recommended dose (0.7 g L-1) was used 3 times in 2007 and twice in 2008. Adults of GWF showed sensitivity to the attack of S. feltiae, and also showed sensitivity to the application of the thiamethoxam. Different control strategies had greater influence on the mean mass of cucumbers than the type of growth substrate. In the control treatment, where we found the highest number of GWF adults in both years, the mean mass of cucumbers was the lowest. In 2007, the mean number of GWF adults per leaf was significantly the lowest in treatment with thiametoxam, while in 2008 there were no differences between the influence of thiamethoxam and EPNs. Light expanded clay aggregate appeared to be a less appropriate growth substrate, as cucumbers grown on this type of substrate produced the lowest number of fruits per plant.
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