BILOGICAL EFFECT OF Beauvera bassiana (Bals.) Vuill. ON THE FIRST LARVAL INSTAR OF TOMATO LEAF MINOR Tuta absoluta (Meyrick)

Study were conducted to evaluate the biological effect ofBeauveria bassianawith four concentrations (105, 106, 107and 108) spores/ ml after two exposure times (one & two day) and two application methods as biocontrol agents against tomato leaf miner 1st instar larvae and its residual effect on other stages. Results indicated thatB. bassiana was pathogenic to the first instar larvae of tomato leaf miner although. Its capability differed according to the application method, fungus concentration and exposure duration. The larval mortality percentages increased significantly withB. bassiana at 108spores/ ml. to reach 58.146% and 40% for larvae directly sprayed and larvae feed on tomato leaves sprayed withB. bassiana conidial suspension respectively. The results also showed thatB. bassianahad a residual effect on the survivous larvae after treatment, that the lowest adult emergency percentage was 0.00% from the first instar larvae treated directly withB. bassiana conidial suspension at both 107and108 spores/ml. compared with 96.66 % in control treatment.