Populations Dynamic of Phytoseius Finitimus (Ribaga) During the Two Years of Study in Sheshi Zi Grape Cultivar

The population's dynamic of Phytoseius finitimus followed in one autochthon Albanian grape cultivar Sheshi zi. The study was carried from May to September 2016-2017. The main objectives of the study was to follow population dynamics of Phytoseius finitimus (Ribaga), to see the difference between life stage of Phytoseius finitimus, to see the difference between Phytoseius finitimus and tetranychid mites population, to see if we have any difference between years and who was the most populated period with phytoseiids. During this study, except Phytoseius finitimus, we have found also tetranychid mites. Phytoseius finitimus was present in all periods of the study. During two years of study we have observed a very high number Phytoseius finitimus population especially in the first period of September 2016. The less populated period with Phytoseius finitimus was the first period of June 2016. During this study in the first and the third period of September 2016 we have found the highest number of adults per leaves. The most populated period with larves was the third period of July 2016. Eggs are found in higher number in the third period of September 2016. During 2016 larves and adults are found in higher number than eggs, we have found significant difference between adults-eggs and larveseggs, whereas between adults and larves we haven't any significant difference. During 2017 adults are found in higher number than larves and eggs. Also larves are found in higher number than eggs. We have a significant difference between all stages of Phytoseius finitimus (adults-eggs, adults-larves, larves-eggs) during the second year of the study. Tetranychid mites are found in higher number in the first year of study in the third period of July. From both years of the study phytoseiid mite (Ph.finitimus) was found in higher number than tetranychid mites, we have a significant difference between Phytoseius finitimus and tetranychid mites populations during 2016 and 2017. During the study in the first year we found more Phytoseius finitimus than the second year, we have a significant difference between years (P=0.02). In the second year of study the temperature has an impact on the decrease of Phytoseius finitimus population (Significance F=0.004), (R² = 0.29), with equation y= - 0.1001x-5.0298.