Tetranychus urticae, Koch, 1836

Barbar, Ziad, 2017, Evaluation of three pesticides against phytophagous mites and their impact on phytoseiid predators in an eggplant open-field, Acarologia 57 (3), pp. 529-539 : 531

Mortality of Tetranychus urticae caused by fenbutatin oxide

The ratios of reduction (mortality ratios) of T. urticae were significantly different between sampling dates (F = 2.39; df = 19; P = 0.006) ( Figure 2 ). One day after the first application, fenbutatin oxide produced 42.6 % reduction of T. urticae . This ratio increased gradually and reached 79.2 % after 21 days. When the second application was carried out, mortalities were from 92.5 % to 96.0 % during 21 days. The ratio slightly increased to 99.3 % at 21 days after the third application and then, a gradual decrease was observed and reached to 57.0 % at the end of the experiment ( Figure 2 ).

Figures

FIGURE 2: Mortality (% ± S.E.) of Tetranychus urticae observed in fenbutatin oxide treatment applied three times (I, II and III) in the eggplant filed studied in Latakia province, Syria.