Investigations on the population development and damage ratio of tomato russet mite [Aculops iycopersici (Massee)] on different tomato varieties

Thesis Type: Postgraduate

Institution Of The Thesis: Bursa Uludağ University, FEN BİLİMLERİ ENSTİTÜSÜ, Turkey

Approval Date: 2016

Thesis Language: Turkish

Student: Elif Aysan



Aculops lycopersici (Massee) (Acari: Eriophyidae) is one of the main pests of tomato plant in Bursa. Chemical control of the mite is relatively difficult because of the high population density of the mite at ripening of tomato fruit and harvesting period. In this study, the effects of varietal differences on population development of A. lycopersici were evaluated on different tomato varieties, namely Dora, Etna, Grande, H2274, Jana and M1103 at controlled and natural conditions. The effect of plant trichomes types and their densities which are a variety of adaptive processes against to herbivores, on the mite's population development. In addition, the present study was to determine the relationships between the damages of the mites on different tomato variety. In natural conditions, the effects on some biotic (plant tricome density and predators) and abiotic (climatic factors i.e. temperature, humidity, rainfall) on population development of the mite were detected in an organic tomato field during 2014-2015. The study showed that A. lycopersici population level on this variety was significantly higher in a stake tomato variety, Jana, compared with that on other tomato varieties. On the other hand, the mite density on Grande and H2274 varieties was less than other varieties. But, the tolerance of Jana was found higher compared the damage level of mites on other variety. Similar to laboratory studies, the mite's population level on Jana variety was found very high compared other varieties, while that on Grande and H2274 varieties was determine very less in the field studies. However, the predator mite densities, especially Tydeus kochi Oudemans, was very low in Jana variety probably due to the high glandular trichome of the variety. Although it was found some predator mite species belong to Phytoseiidae and Iolinidae, their population occurred very low in all tomato varieties probably due the intense glandular and non-glandular trichomes. The mite's population reached highest during mid-August and mid-September when the conditions with the high mean temperature (~25°C) and middle mean relative humidity (50-60%) were observed in the tomato field.