Effect of golder (Rydingia persica) and myrtle (Myrtus communis) extracts in controlling Bemisia tabaci on tomato under laboratory conditions

The use of herbal extracts as natural compounds in pest control is one of the most promising prospects for reducing future chemical pesticide use. The present study was conducted to evaluate in vitro effects of Golder and Myrtle extracts and also interaction between obtained different levels of concentrations for controlling Bemisia tabaci, on tomato under laboratory conditions. Plant extracts were used at 5 levels plus control. The effects of plant extracts and their interactions on B. tabaci, as well as lethal concentrations were determined. Concentrations of 0, 2, 2.5, 3.1, 3.9 and 5 g/L from Golder and 0, 1.4, 1.8, 2.3, 3 and 4 g/L from Myrtle were investigated. Experiments were done at 27±3 °C temperature, relative humidity of 50±6 %and the photoperiod of 16:8 hours L:D. Results showed that the median lethal concentration (LC50) amounts of myrtle and golder were respectively 2.56 and 3.39 g/L and they were significantly different with each other (P<0.05). Also Golder extract up to 5 g/L concentration and the extract of Myrtle up to 4 g/L concentration, whitefly mortality was increased. The maximum mortality rates of B. tabaci related to the plant extracts were 79.8 percent at 5 g/L concentration of Golder, and 81 percent at 4 g/L concentration of Myrtle, respectively. Analysis of the interaction between the whitefly B. tabaci and the plant extracts showed that the maximum mortality was due to interaction between Golder at the level of 5 g/L, with Myrtle concentration of 2.3 g/L, 3 g/L and 4 g/L, created 95 %, 96.3 % and 97.3 % mortality, respectively.