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Articles by N.P. Deligeorgidis
Total Records ( 4 ) for N.P. Deligeorgidis
  N.P. Deligeorgidis , C.G. Ipsilandis , G. Sidiropoulos , V. Greveniotis , L. Giakalis and P.N. Deligeorgidis
  The aim of this study was to record the population and the fluctuations of Tingis sideritis Š tus á k, on a wild population of Sideritis scardica Griseb. of mount Vermion, Greece. This is the first reference for the presence of T. sideritis in Greece, a new enemy of S. scardica. In year 2005, recordings of T. sideritis population started at 15 of May and lasted until 4 of July. These recordings were repeated every 10 days (6 periods in total) on 50 wild tea plants selected in random. Two branches of each wild tea plant were studied. In year 2006, recordings of T. sideritis population started at 12 of May and lasted until 1 of July (with the same procedure as in 2005). In the laboratory, the insects of each branch were measured under a stereoscope and total replications were 100 (50 plants X2 branches). Period of recordings x year interaction found statistically significant at p<0.001. In general, year 2006 showed lower total number of adult insects in comparison to year 2005, may be due to the presence of natural enemies of T. sideritis, but most important is the different population fluctuations between the two years and it seems to be a common biological phenomenon in insects. If we take in consideration that a Sideritis plant may possess about 9-10 branches, then we can find about 100 adult insects/plant.
  P.N. Deligeorgidis , N.P. Deligeorgidis , S. Kayoglou , G. Sidiropoulos , M. Vaiopoulou , D.G. Stavridis , V. Greveniotis and C.G. Ipsilandis
  The aim of this study was monitoring and control of Quadraspidiotus perniciosus on apple trees, in the prefecture of Florina, Greece. Half of the experimental area was used as a check field (no application) and in the rest a chemical insecticide was used. Sticky and pheromone traps of the same type were used for monitoring Q. perniciosus in both fields. Samples were taken every 10 days and pheromone application was renewed every month until 17 of October for year 2004 and 22 of October for year 2005. Sticky traps were used for monitoring insects of immature stages. For controlling Q. perniciosus two applications were made using insecticide chlorpyrifos (Dursban) in the application field, at 19 of June and 19 of July for year 2004 and 14 of June and 14 of July for year 2005. Results showed that, populations of adult insects and of immature stages of Q. perniciosus were considerably increased in the check field during the two years of this study. In the application field insect populations were considerably decreased due to the effectiveness of the insecticide used applied. Year conditions influenced statistically significantly population fluctuations of insects (in adult and immature stages). There was not found any relation between trapped male population and larvae population and this was considered the most important finding for monitoring purposes.
  N.P. Deligeorgidis , C. Karypidis , P.N. Deligeorgidis , C.G. Ipsilandis , M. Vaiopoulou and G. Sidiropoulos
  The predatory effect of female adults of four Coccinellid species on two aphid species was examined under laboratory conditions in controlled environmental chambers. This study was conducted on single rose leaves in transparent small plastic cages at varying proportions of predator/total number of aphids. The predators used proved to be effective for the biological control of aphids under controlled conditions. It is proposed to use C. septempunctata in biological control programs in greenhouses and fully controlled conditions, only under high pest densities (at proportions over 1:30 predator/aphids). It is also proposed to use M. picta in biological control programs in greenhouses, as a specialized predator of A. spiraecola at proportions close to 1:30 predator/aphids. A. bipunctata can be used as a predator for T. aurantii at the same proportions. H. variegata can be used as a predator of both aphid species with satisfying effectiveness at proportions close to 1:30 predator/aphids.
  P.N. Deligeorgidis , N.P. Deligeorgidis , C.G. Ipsilandis , A. Vardiabasis , D. Stavridis , M. Vayopoulou and G. Sidiropoulos
  The purpose of this study was to monitor population fluctuations of two thrips species (Limothrips cerealium and Limothrips denticornis), during the growing season of durum wheat, in years 2009 and 2010. Samplings of insects were taken in eight periods to cover the late stages of durum wheat. Measurements were made every about 100 m in the field, with five wheat plants per sample, from 10 different places. Total thrips individuals (per species) on each wheat plant were counted. The species Lema melanopa was also included in measurements (to make comparisons between thrips species more independent). According to the results for all three insects studied, sampling period showed the greatest differences. L. denticornis and L. melanopa, showed a significant interaction between year and sampling periods, indicating different population fluctuations in the two years. L. cerealium showed a stable population fluctuation across years. L. denticornis, showed also differences in population across years. This unstable behavior may be a result of some specific enemies or competition phenomena between the two thrips species, since maximum values of the two species were recorded in different sampling periods. Maximum number of thrips individuals found on each plant was 7 for L. denticornis and 9 for L. cerealium but maximum average values were close to 2 for L. denticornis (in 6th sampling period) and 2.8-3.3 for L. cerealium (between 4th and 5th sampling period). The relatively low populations of thrips species found in this study did not resulted in significant and apparent damages in durum wheat cultivation but the economic threshold for L. denticornis and L. cerealium has to be decided in combination to other insect pest species.
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