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EFFECT OF RELEASE PARASITOIDS Earias insulana BOISD Trichogramma principium WEST AND Bracon brevicornis WESM WITH PARASITES MIDDLE OF IRAQ | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 14, Issue 6, 2009, Pages 0-0 | ||
| Authors | ||
| A. N. Al-Khalidy; R. F. Al-Jassany; S. A. Abdulrazaaq; A. M. Attia | ||
| Abstract | ||
| The study has conducted to evaluate the efficiency of the parasitoids Trichogramma principium and Bracon brevicornis on the infestation of spiny cotton bollworm Earias insulana Boids on the cotton at two governorates Babylon and Al-Qadysia during the season 2006. The results showed that parasitoids cause high reduction in the numbers of eggs and larvae of spiny cotton bollworm at the fields treated with parasitoids, whereas the average population of the eggs and larvae together reached 3.999 and 5.207 ind /leave of the fields of treated and control respectively in Al-Qadysia governorate , while reached 2.436 and 3.179 ind /leave of the fields of treated and control respectively in Babylon governorate . Also, the result showed significant differences in the average population of the eggs and larvae during the deferent times of the season , reached the highest population during October in average 8.995 individual and the lower population end of June in average 0.416 individual in Al-Qadysia governorate ,while reached the high population during the first week of September in average 7.415 individual while the lower average reached during June with 0.083 individual in Babylon governorate . The larvae of lepidopteron pest which recorded in cotton fields beside spiny cotton bollworm includes Pectinophora gossypiella, Spodoptera littoralis and Trihoplusia ni. with average population reached 6 and 14 larvae / 30 plants in treated and control fields respectively in Babylon governorate . The stoical analysis of the results showed signification differences in the percentage of infestation and in the ratio of larvae in treated cotton field compared with control field, this results showed the distinguished role of parasitoid for control the insect , so can repeat the release of the different parasitoid especially before the insect begin to build its highest population densities. | ||
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