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Articles by P.N. Deligeorgidis
Total Records ( 10 ) for P.N. 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 , C.G. Ipsilandis , M. Vaiopoulou , N.P. Deligeorgidis , D. Petkou and E. Simopoulos
  During the present study, an evaluation of damage caused by Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) on cucumber leaves is given. The experiment took place in May 1999. For this purpose, 50 cucumber plants (Cucumis sativus L., F1 Kamaron) were used. The plants grew in small pots covered by plastic cages in a glasshouse. Plants with the first real leaf developed (approximately 14 cm2), were divided in Groups I-V, each consisting of 10 plants. On each plant of the first four Groups, 5, 15, 25 and 35 females of F. occidentalis were released respectively, while Group V was used as control. Plants remained covered by the plastic cages in the glasshouse throughout the experiment for 18 days. The number of thrips individuals placed on each plant remained stable during the study. Results showed that, the damage on cucumber leaves increases relatively with the number of thrips. The damaged leaf area was 1.02 cm2 at 5 thrips individuals, increasing at 7.81 cm2 at 35 thrips individuals. Photosynthetic capability was also reduced. The chlorophyll content estimation in SPAD units was almost intact when initial number of thrips was 5 individuals in comparison to the control, but readings of the instrument decreased rapidly in greater initial population.
  P.N. Deligeorgidis , C.G. Ipsilandis , G. Kaltsoudas , L. Giakalis , D. Petkou and N.P. Deligeorgidis
  The damage on cucumber (Cucumis sativus L., F1 Kamaron) production caused by Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) was estimated in a glass greenhouse during the year 1999. Thirty two cucumber plants were separated in four groups; each group consisted of eight plants, which per two were covered with large cages made of muslin. 0, 5, 20 and 35 female adults of F.occidentalis were released correspondingly on every plant of these four groups. The thrips were released and grew up freely. The results of this research showed that, as the population of the thrips increased, it was observed an important decrease in the number of cucumbers per plant, the cucumber length, the cucumber mean weight and the total production per plant (kg). Initial thrips number consisted from one-day old adult females, resulted in linear correlated damages to all the production parameters studied.
  P.N. Deligeorgidis , C.G. Ipsilandis , G. Kaltsoudas , G. Sidiropoulos , N.P. Deligeorgidis , M. Vaiopoulou and A. Vardiabasis
  he present study was conducted in Voion county in the region of Kozani, in tobacco fields, involving population monitoring for two years (2004 and 2005), for three insects: Thrips tabaci, Epitrix hirtipennis and Myzus persicae. Two combined insecticides were applied: Tamaron 600SL (methamidophos) and Confidor 200SL (imidachloprid) and a check field (without application) was used. Sampling was conducted at seven periods, with 85 main samples consisted of three plants. Insecticide application reduced insect population about 70-74% and especially thrips population (up to 78%), resulting in double field yield performance of tobacco in comparison to check fields (no application). In the second year, there was a reduction of initial insect population, maybe due to previous effective application of insecticides and environmental conditions. There was a considerable interaction between insecticide application, insect species and sampling period, indicating different effectiveness of insecticides on insect species and differences in seasonal population fluctuation (due to different biological cycles of the insects during the cultivation period). Differences between years were found, indicating different environmental conditions. In general, there were greater populations of thrips or green aphids than flea beetles (about 30%). Second insecticide application was not only indispensable, but also lead to increased efficiency of insecticides. Finally, different environmental conditions, including transplanting period, may affect uniformity of insecticide application in the tobacco fields.
  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.
  D.G. Stavridis , P.N. Deligeorgidis , A. Gliatis , C. Giatropoulos , E. Mola , C. Fotiadou and C.G. Ipsilandis
  The aim of the present research was to study fluctuations of populations of P. gossypiella in various areas in the Prefecture of Larissa. Data were analyzed to found the relation between population density of the insect and cotton production and additionally, to explore year and local (area) conditions as factors affecting damage levels. Correlations on data between years (across all communities) revealed that, when cotton production was high then the number of adult male insects of P. gossypiella captured in pheromone traps was also high (r = +0.93). Our data indicate that, when the environmental conditions of specific years favored cotton production, then the population of P. gossypiella was high due to the availability of food (more flowers and bolls), in a kind of synchronization. In parallel, the presence of increased numbers of useful insects that predate cotton enemies may result in lower damages on cotton production. In years 2002 and 2003, the presence of the insect may contribute in lower cotton production in the areas where population of adult males trapped was high. The mean cotton production was generally low in the areas where population of P. gossypiella was high. In this case, although statistically not significant, the tension was negative (r = -0.37). Local conditions within each area have been proved important and these results were completely different compared to data concerning years. The specific conditions within each area determine the balance between the insect population and level of damage on cotton production. There were areas where the insect showed increased populations resulting in low cotton production. These areas may need special treatment with insecticides or other techniques in order to decrease insect populations.
  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.
  P.N. Deligeorgidis , C.G. Ipsilandis , M. Vaiopoulou , N.P. Deligeorgidis , D.G. Stavridis and G. Sidiropoulos
  The duration of life-cycle (egg-adult) and the longevity of the female adults (in days) of two thrips species, Frankliniella occidentalis (Pergande) and Thrips tabaci Lindeman (Thysanoptera: Thripidae) on cucumber and tomato plants were studied, under controlled conditions. Research indicated that, life-cycle of the two thrips species did not differed significantly between cucumber and tomato plants, while longevity of female adults of F. occidentalis is longer in comparison to T. tabaci in both plants examined and both species lived longer on cucumber plants in comparison to tomato plants. In mixed colonies of the two species, there were found significant differences in longevity of female adults, indicating that Frankliniella occidentalis may reduced longevity of Thrips tabaci in a kind of a competitive behavior and this was related to the host-plant and initial thrips population.
  P.N. Deligeorgidis , L. Giakalis , G. Sidiropoulos , M. Vaiopoulou , G. Kaltsoudas and C.G. Ipsilandis
  The biological cycle, the duration of preoviposition-oviposition-postoviposition periods, female adults` longevity, reproduction dynamic (eggs/female) and reproduction rate (eggs/female/day) of Frankliniella occidentalis (Pergande) and Thrips tabaci Lindeman (Thysanoptera: Thripidae) were studied on cucumber at 15, 20, 25 and 30°C. The biological cycle of F. occidentalis ranged from 33.99 days at 15°C to 11.99 days at 30°C, while that of T. tabaci ranged from 32.76 to 11.78 days at respective temperatures. The duration of each developmental stage for both thrips species was reduced with temperature increase. Total female longevity of F. occidentalis decreased when temperature increased from 15 to 30°C, while the longevity of T. tabaci was lower and also decreased from 15 to 30°C. For F. occidentalis the maximum reproduction dynamic and reproduction rate was found at 20°C and minimum at 15°C. For T. tabaci the maximum reproduction dynamic was also found at 20°C and the optimum reproduction rate at 25°C, but without statistically significant difference when compared to reproduction rate at 20°C. The minimum values of T. tabaci were also found at 15°C. Cucumber found to be a suitable host plant for survival and reproduction of both thrips species. Temperature may affect thrips population, especially when measurements our out of normal temperature range.
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