مقالات رزومه لیلا رمضانی

Phenacoccus solenopsis Tinsley is a global pest which recently causing serious damage to various crops and ornamental plants such as hibiscus shrubs in southwestern Iran. The field biology of this pest was investigated in Dezful during 2015-2016 season. Results indicated that in Dezful, P. solenopsis passes 11 generations per year. The first generation begins from early March to early April, and the 11th generation ends in the mid-March. The mealybug activities did not stop during the winter. The 8th generation was the shortest one which lasted 28.71±1.39 days from the late September to the mid-October. The longest generation time was also the 2nd one (47.47±0.79 days), from early April to early May. The reproduction parthenogenetically occurred, and females produced eggs and crawlers. The highest fecundity was163.11±3.11 offspring per female with the highest ovipositional period (4.41±0.14days) in the 4th generation in summer. The lowest fecundity (1.67±0.12offspring) was in the 11th generation in winter. The female longevity was significantly different among various generations, from 13.79±2.03 days in 11thgeneration to 26.12±0.70 days in 2nd generation. Males lived in a short time (1 to 2 days). The present study confirms that P. solenopsis has a rapid development, high fecundity with a pattern of crawlers’ production, and the ability to adapt to the unconditional warm and dry climate of Dezful. Unfortunately, due to lack of management, and a wide range of host plants, it could be a serious threat for farmlands, greenhouses, and urban areas in Khuzestan province.

Population dynamics and spatial distribution of two harmful species of Thysanoptera prevalent on cereal crops (Thrips tabaci Lindman، 1888 and Haplothrips tritici Kurdjomove، 1912)، were investigated during 2009-2011. Weekly sampling was carried out in a one hectar of wheat field in Ramin University of Khuzestan، South-West of Ahvaz. Spatial distribution of immature as well as adults of either species was investigated through Taylor’s power law and Iwao’s patchiness regression methods. The results revealed that the population peak for either species occurs in late March and on the first to middle of April respectively for adults and for larvae. Results of correlation between population dynamics (larval and adult stages) and the factors temperature and precipitation revealed that there is positive vs negative correlations between population fluctuation and the factors of temperature vs humidity. An investigation of the spatial distribution through Taylor’s power law and Iwao’s patchiness regression method indicated that larval stage and total stages in both species are clumped. Based upon R2 and F of regression analysis، Iwaos patchiness provided a more adequate description of spatial distribution than Taylor’s power law for either of the species. Because the seasonal peak in these two species'' density corresponded with the period of peak bloom، thus، in order to study the population dynamics، the earing stage is the most suitable for sampling the thrips on wheat.

A faunistic study of the order Thysanoptera was conducted in cereal crop fields of the southwestern Iranian province of Khuzestan during 2007-2009. The species Florithrips traegardhi (Trybom) was collected from various grasses including corn، rice and wheat and later found its genus and species are new records for Iran.