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Background The pine processionary moth,  Thaumetopoea wilkinsoni  Tams, 1926 (Lepidoptera/Notodontidae) is one of the most harmful insects that destroys pine ecosystems by feeding on pine leaves at its larval stage. Because of its urticating setae, the insect also causes severe skin reactions to animals and humans. Instead of chemical control, eco-friendly biological control methods are preferred to combat this species. Results The purpose of this study was to evaluate the efficacy of five different  Beauveria bassiana  Vuill, 1912 (Hypocreales/Cordycipitaceae) isolates (TR-SM-10, TR-SM-11, TR-SM-2, TR-SK-1 and TR-D-1) and one  B. pseudobassiana  Rehner &amp; Humber (Hypocreales/Cordycipitaceae) isolate (TR-SM-1) against the fourth instar larvae of  T. wilkinsoni  under laboratory conditions.  T. wilkinsoni  larvae were collected from the Ondokuz Mayıs University Kurupelit Campus in Samsun, Turkey, in 2021, and the fourth instar larvae were used in the experiment. Two ml of spray of the six fungal isolates were applied to every ten larvae at each concentration (1 × 10 7  and 1 × 10 8  conidia ml −1 ). The experiment was carried out in five replicates per group, and the larvae were observed for 10 days. As a result, all isolates of  B. bassiana  caused 100% mortality at 1 × 10 8  conidia ml −1  concentration.  B. pseudobassiana  isolate also caused 100% mortality at both concentrations. At 1 × 10 7  conidia ml −1  concentration, the larvae treated with the  B. pseudobassiana  isolate (TR-SM-1) had the lowest LT 50  (2.89 days) and LT 90  values (4.79 days), while the larvae treated with TR-SM-10 isolate had the highest LT 50  (5.65 days) and LT 90  values (9.39 days). At 1 × 10 8  conidia ml −1  concentration, the larvae treated with TR-SK-1 isolate had the lowest LT 50  (2.89 days) and LT 90  values (4.79 days), while those treated with TR-SM-10 isolate had the highest LT 50  (3.95 days) and LT 90  values (8.15 days). Conclusion It has been recommended that the five different isolates of  B. bassiana  and  B. pseudobassiana  isolates were virulent to  T. wilkinsoni  larvae and can be used for biological control of  T. wilkinsoni .

egyptian journal of biological pest control

Efficacy of Beauveria bassiana and Beauveria pseudobassiana isolates against the pine processionary moth, Thaumetopoea wilkinsoni Tams, 1926 (Lepidoptera/Notodontidae)