Abstract

Until very recently, little data dealing with interactions between gerbera and spider mites were available. Results of our preliminary experiments indicated that the two-spotted spider mite ((Tetranychus urticae Koch) performed better on Estelle and Donna Tella gerbera cυs than on Fame cυ. In this study gerbera plants were morphologically and biochemically compared before and after spider mite infestation. Leaves from two-month-old micropropagated gerbera (Gerbera jamesoni Bolus, cυs Fame, Donna Tella and Estelle) plants were used in all experiments. Type of leaf hairs as well as their density were examined using a stereomicroscope. Some biochemical analyses were performed after three days of spider mite feeding on a third gerbera leaf. The initial number of females was 3.2 per cm2 of leaf. The infested area of leaves and the adjacent area were cut and soluble protein content, total phenolic concentration and phenylalanine ammonia lyase (PAL) activity were determined.

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