Trips (Thysanoptera: Thripidae) Pada Bunga Dan Buah Manggis Serta Hubungannya Dengan Kejadian Burik

Abstract

. Fardedi, Maryana, N, Manuwoto, S and Poerwanto, R 2012. Thrips (Thysanoptera: Thripidae) in Flower and Fruit of Mangosteen (Garcinia mangostana L.) and the Correlation to Fruit Scars. Scars on mangosteen decreases the quality of this fruit economically. At the moment, information about management and causal factor of the scars on mangosteen in Indonesia are very limited. The aims of this research were to investigate the fruit scars, the population dynamic of thrips, and the correlation to the fruit scars. The association between thrips and mangosteen flowers and fruits as well as the correlation between thrips population to the fruit scars was investigated. The research was conducted at Cengal Village, Bogor District, West Java from May 2009 to August 2010. Laboratory investigation was carried out in Insect Biosystematics Laboratory and Plant Anatomy Laboratory, Bogor Agricultural University. Parts of plant observed were the shoot, flower bud, opened-flower, and fruit of 1 - 16 weeks after anthesis (WAA). The scars occurred in fruit cuticle and exocarp. There were two species of thrips, Scirtothrips dorsalis and Thrips hawaiiensis, that were found at flower bud, opened- flower, and fruit. The highest larva population of S. dorsalis and T. hawaiiensis imago were 1.15 and 0.95 each flowers, the highest larva population was on 2 WAA fruits (8.75). The population of adults for both species was high in opened-flower. The population of larva was also high on fruit 2 WAA. The population of thrips decreased along with fruit growth. Scars occurred on fruit 2 and 3 WAA. There was a correlation between the abundance of thrips on fruit 2–3 WAA and scars at mangosteen fruits. Trips density 10.6 could cause scars on 2 WAA fruits. Thrips population and the symptoms of scars occurred on the early growth of fruits, therefore to control the trips using insecticide was suggested to be applied before flowering stage