Agroznanje (Jan 2011)
The presence of onion thrips (Thrips tabaci Lind.) and symptoms of attack on onion in the Banja Luka region
Abstract
Onion thrips - Thrips tabaci Lind. (Thysanoptera: Thripidae) is a cosmopolitan polyphagous pest. In Southern Europe it is particularly serious for tobacco, in Central Europe for the onion, leeks and cabbage, and in northern Europe for flowers production in greenhouses. In the Republic of Srpska and regional countries it causes serious loos of the onion yield, particularly during dry years. In 2006 and 2007, in Banja Luka region, in the locations Vakuf, Šargovac, Petrovo Selo and Kosjerovo, presence of onion thrips and symptoms of attack on onion were observed. In term to detect presence of the pest, onion plants were visualy observed and, in addition, adults were collected using yellow water traps. Yellow water traps were placed at the plot and changed in 7-10 days intervals during vegetation. In both years adults were detected in all inspected locations, except in location Šargovac in 2006. Total of 30 adults were captured in 2006, and 55 in 2007. In 2007 first adults were detected earlier than in 2006.Soon after first adults of onion thrips had been detected, larvae were also found in several locations. Damages of infested onion plants are caused by feeding of larvae and adults which are mostly concentrated in the basis of the leaves.
