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Tetranychus piercei  (Acari: Tetranychidae) is a spider mite that infests a wide range of plants. It is difficult to control due to its ability to quickly develop resistance to common pesticides. The study aimed to find the effect of relative humidity (55, 75, and 95 ± 2% RH) on the efficacy of the entomopathogen  Cordyceps tenuipes  (1 × 10 6 , 1 × 10 7  and 1 × 10 8  conidia/ml) against the egg and adult female stages of  T. piercei . The results showed that the mortality of  T. piercei  eggs was concentration-dependent and that RH has a synergistic effect on efficacy. The egg mortality increased with the increasing the concentration from 1 × 10 6  to 1 × 10 8  conidia/ml at the same RH condition, and it was significantly higher at 1 × 10 8  conidia/ml at 95% RH than at 75 and 55% RHs. The median lethal time (LT 50 ) for adult females was 41.1 hours at 95% RH and 49.8 hours at 75% RH when treated with a concentration of 1 × 10 8  conidia/ml. This was significantly lower than the LT 50  values at other relative humidity levels and concentrations. The results of the study on potted bean plants showed that double spray of  C. tenuipes  was effective in controlling  T. piercei  infestations at a concentration of 1 × 10 8  conidia/ml. With a single spray of  C. tenuipes , the mite population tends to be reduced initially and then increased subsequently. Thus, considering RH and incorporating other strategies is important when using biological control methods to effectively control this pest.

international journal of acarology

Efficacy of entomopathogen  Cordyceps tenuipes  (Peck) Kepler, B. Shrestha et Spatafora against spider mite  Tetranychus piercei  McGregor (Acari: Tetranychidae)