Adana ilinde bazı ılıman iklim meyvelerinde iki thrips (Thysanoptera) türünün populasyon değişimleri ve zararı üzerine araştırmalar

Abstract

1Summary Population fluctuations of two thrips (Thysanoptera) species and the thrips damage associated with some temperate fruits in Adana province, Turkey In this study, the population fluctuations of two common thrips species, Frankliniella occidentalis (Pergande) and Thrips major Uzel (Thysanoptera:Thripidae), and the thrips damage associated with temperate fruit crops, plum (Prunus domestica), apple (Malus domestica) and nectarine (Prunus persicae var nectarina) were examined in Adana between 2007-2008. T. major was the predominant thrips on apple flowers, while adult F. occidentalis were more abundant on the flowers of plum and nectarine. The mean numbers of adults of both thrips peaked in the flowers of trees at the beginning of petal fall (end of March) and thereafter their numbers decreased to low levels. Mean numbers of larval thrips increased to peak levels at the period between petal fall and forming of fruits. Numbers of adults and immature thrips were very few at the maturation periods of fruits. F. occidentalis was the main thrips species causing economically important damage on crops. It caused scarring and silvering damage on the fruits. Damage on the unripe fruits of plum and nectarine were detected after occurrence of average two adults per flower and 4-8 larval thrips per fruit. This damage symptoms on fruits (7-15 days old) is mainly due to attacks of larval thrips. In 2007 scarring ratio in apple, plum and nectarine fruits was 5%, 30% and 29 % respectively. In 2008, there was no thrips on the apple fruits, 1% and 9%, of plum and nectarine fruits were scarred.