Thesis Type: Postgraduate
Institution Of The Thesis: Bursa Uludağ University, FEN BİLİMLERİ ENSTİTÜSÜ, Turkey
Approval Date: 2014
Thesis Language: Turkish
Student: Aysun Alsan Pınar
Supervisor: NABİ ALPER KUMRALAbstract:
Twospotted redspider mite, [Tetranychus urticae (Koch)] (Acari: Tetranychidae) in most countries and ours, is a pest for vegetables, especially in bean, eggplant and pepper, it causes an economically yield loss. Because of that, in those plants, the spider mite populations should be brought under control with appropriate methods, before the injury level of, the spider mite outreach the economic injury threshold. In order to do that, the spider mite populations should be counted and estimated. Due to the fact that, the mites are too small, it is hard to collect and count them. Therefore, instead of counting, mite's populations directly, the method of counting them indirectly have to be developed. For this purpose, in this thesis study, plants namely Magnum, bean variety, [Phaseolus vulgaris L. (Fabaceae)], Pala 49, eggplant variety, [Solanum melongena L. (Solanaceae)], and Yalova charleston 341, pepper variety, [Capsicum annum L. (Solanaceae)] are used. 0, 1, 5, and 10 number of adult, the spider mite individuals had been infected preternaturally per leaf of those plants, and the number of egg, larva, and adult members had been counted in the 7., 14., 21., and 28. days. In these same days, the proportion of yellow spots emergence, and decolorization had been determined, and the relation between, the spider mite populations and indications of injury had been determined by regression analysis. According to results; for bean, while r2=0,944 had been calculated, depending on increasing in the number of, spider mite, r2=0,191 had been calculated which depends on the rate of egg injury in the end of 14. day for the plants which are infected with 1, red spider mite. Also, for the plants which are infected by 5, the spider mite, r2=0,690 had been calculated, depending on increasing in the number of, the mite, and at the rate of egg injury, r2=0,056 had been calculated in the end of 14. day. For eggplant, r2=1 had been calculated, depending on increasing in the number of, the spider mite, and also depending on the rate of egg injury, in the end of 14. day for the plants which are infected with 10, red spider mite. For pepper, r2=0,993 had been calculated, depending on increasing in the number of, the spider mite, and r2=0,064 had been calculated, depending on the rate of egg injury, in the end of 21. day for the plants which are infected with 1, the mite. For those 3 plant varieties, the direct correlation had been observed between, the red spider mite's feeding mobile periods and the rate of getting injuried of plants. According to the observed regression formulas, the number of mobile, the spider mite's period of every injury level had been estimated similar to its real number. In conclusion, by using formulas that we observed and injury images that show every injury levels, producers and agriculture engineers can determine the population of T. urticae in bean, pepper, and eggplant without pluck any leaf or count the number of, the spider mite, in the field. In the future, based on this thesis study's results, indirectly counting methods can be developed both for this harmful mite, and similar harmful mites, and the results can be confirmed by making more practise in the nature.