Abundância e sazonalidade do ácaro-rajado em cultivares de gérbera

In this study it was evaluated the abundance and seasonality of Tetranychus urticae Koch, 1836 in three varieties of Gerbera jamesonii Adlam. in a commercial cultivation at the south of Brazil. For the evaluation of these parameters samplings were accomplished from April 2011 to February 2012. The mites were obtained from flowers and leaves removed from each one of the studied varieties. A total of 10,640 mites were counted, and in agreement with the tests, there were a significant larger number of mites in the "Pink Snow" variety. The statistical analysis didn't evidence conclusive differences in the mite numbers between leaves and flowers. In all three varieties the largest number of T. urticae was registered in the spring