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EFFECT OF THE FUNGUS BEAUVERIA BASSIANA(Bals.)Vuill.AND BIO-FORMULATION ON DIFFERENT STAGE OF CITRUS MEALYBUG | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 43, Issue 0, 2013, Pages 92-97 | ||
| Authors | ||
| Sahar M. Salih; Hussam A. Abdallah | ||
| Abstract | ||
| The laboratory study of the effects of two fungal preparations of Beauveria bassiana (local isolate) and Mycotal formulation on different stages of mealybug P.citri showed the following results. The highest percentage of unhatched eggs reached to 78.5% after one week of Beauveria bassiana (local isolate) treatment, while it was 90.6% when the bio–formulation Mycotal was used. The highest conc. (1 x 106 spore/ml) of B.bassiana formulation showed a sub-lethal toxicity after one month of treatment in that the developmental period of nymph stage took longer time. The percentage of mortalities of the 2nd nymphal instar treated with Mycotal or B.bassiana were very low in comparison with eggs and adult treatment. This may be due to the ecdysis of old cuticle of nymphal instar. The highest mortality percente (72.0%) was found when the conc .(5.5 gm/liter) of Mycotal applied to the adults, while it was the lowest mortality (45.5%) when the conc. (1.7 x 106 spore/ml) of B.bassiana was used. It seems the infection of adults was very noticeable from ventral side of abdomen since it is not covered with wax. | ||
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