Biological Control of Tuta absoluta (Meyrick, 1917) (Lepidoptera: | ||
| Kufa Journal for Agricultural Science | ||
| Article 1, Volume 4, Issue 2, December 2012, Pages 200-212 | ||
| Abstract | ||
| Abstract This experiment was conducted in laboratories of College of Agriculture/University of Kufa to evaluate the effect of bacteria Bacillus thuringiensis and fungus Beauveria bassiana in characters of Tuta absoluta. Results showed that using bacteria Bacillus thuringiensis due to significant decrease in egg hatching percentage to 33.36% compared with control treatment which gave 86.74%, meanwhile, the bacteria was using due to increase on killing ratio of larval instars and make it reached to 65.92, 66.55, 64.98, 70.78% for 1st, 2nd, 3rd and 4th instars, respectively, compared with control treatment which have 0% of mortality ratio. Also, the using of B.thuringiensis bacteria was affected on mortality ratio of adults of T.absoluta and gave 78.75% compared with control treatment which did not appear any mortality ratio for insect adults. Results also illustrated that using fungus Beauveria bassiana was affected on all parameters of growth stages of T.absoluta. The using of this fungus was leaded to decrease of egg hatching of T.absoluta to reach to 36.94% compared with control treatment which gave 86.74%, meanwhile, this fungus had significant effect on mortality ratio of larval instars of studied insect and lead to increase of this ratio to be 77.78, 72.51, 76.74, 78.92% for 1st, 2nd, 3rd and 4th instars, respectively, compared with control treatment which have 0% of mortality ratio. Also, results showed increasing in mortality ratio when using B.bassiana on adults of insect and the mortality of adults was 90.45% compared with control treatment that did not appear any morality ratio of insect adults. | ||
|
Statistics Article View: 30 PDF Download: 22 |
||