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

• Main Authors: Saeed Merza, Suaad I. Abdullah
• Format: Article
• Language: Arabic
• Published: College of Agriculture 2018-03-01
• Series: Mesopotamia Journal of Agriculture
• Subjects: tomato moth tuta absoluta; beauveria bassiana; first larval instar; adult emergency
• Online Access: https://magrj.mosuljournals.com/article_161434_63160144b0626203dac9e202dae73667.pdf

Study were conducted to evaluate the biological effect of <em>Beauveria bassiana</em> with 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 1^st  instar larvae and its residual effect on other stages. Results indicated that <em>B. bassiana</em>  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 with <em>B. bassiana</em>  at 10⁸ spores/ ml. to reach 58.146%   and 40% for larvae directly sprayed and larvae feed on tomato leaves sprayed with <em>B. bassiana</em>  conidial suspension  respectively. The results also showed that <em>B. bassiana</em> had 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 with<em> B. bassiana</em>  conidial suspension at both 10⁷and 10⁸  spores/ml. compared with 96.66 % in control treatment.