ON THE PARASITOID COMPLEX OF PIERIS RAPAE LARVAE ON CABBAGE PLANTATION | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 6, Volume 82, Issue 4, December 2004, Page 1551-1560 PDF (3.01 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2004.275279 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| MOHAMED S. T. ABBAS | ||||
| Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt | ||||
| Abstract | ||||
| The ichneumonid, Hyposoter ebeninus was found to be the sole larval parasitoid of Pieris rapae in cabbage plantations in Menofyia Governorate. Percentages of parasitism on larvae collected during August - December ranged between 40.5 and 90 % with an average of 63 % in 1996 and between 58.3 and 90.6 % with an average of 67.6 % in 1997. The peaks of parasitism were recorded in September in both seasons. The eulophid hyperparasitoid, Baryscapus galactopus was found to parasitize last instar larva of H. ebeninus inside its host P. rapae larva.lt continues its development and emerges from the hoses cocoon . Percentages of parasitism by such a hyperparasitoid on cocoons of H. ebeninus collected from cabbage plantations averaged 23.8 % (range 0.0 -51.5 0/0) in 1996 and 21.8 % (range 0.0 - 48.7 % ) in 1997. The mean total developmental period of B. galactopus (from egg to adult) was 25.2 ± 2.1 days at 23± 1 °C and 19.7 days ± 1.5 days at 27± 1 °C. The number of adults emerged from a single host cocoon collected from cabbage plantations ranged from 6 to 22 with an average of 19.4. Adults of B. galactopus were found to make 1 - 6 holes in the wall of the host cocoons to get out. | ||||
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