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Articles by M. Vaiopoulou
Total Records ( 4 ) for M. Vaiopoulou
  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 , 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.
  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 , 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.
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