EFFICACY OF THE EGG PARASITOID Trichogramma evanescens WESTW. FOR CONTROLLING THE EUROPEAN CORN BORER Ostrinia nubllalfs HBN. ON I MAIZE PLANTATION | ||
| Journal of Plant Protection and Pathology | ||
| Article 7, Volume 28, Issue 5, May 2003, Pages 4067-4075 PDF (578.34 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2003.243523 | ||
| Author | ||
| Sahar Y. Abdel-Aziz, | ||
| Deptemartment of Economic Entomology and Pesticides, Fac. of Agric., Cairo Univ. | ||
| Abstract | ||
| The efficacy of field releases of the egg parasitoid, Ttic ogramma evanescens Westw. against Ostrinia nubila/is Hbn. on maize plant tion were investigated at Giza region in 2000 and 2001 seasons. Fi.ve releases were made in 3 days intervals with a total release density of 60000 para sitoidslfeddan to control an artificially placed egg masses of O. nubila/is. In 2000 season, the mean perpentage of parasitism was 40.19% in the treated area and 2.88% in the untreated one. The died and lost eggs averaged 7.9% and 4.1 % in the trealed plots in comparison with 6.6% and 4.3% in control. The hatched eggs of O. nubi/alis were 29.2 and 66.3% in the treated and untreated areas, respectively. For 2001 season, the highest percentage of parasitism occurred by the end of the release period with 73% in the released area and 29.83% natural parasitism in the unreleased one. The mean percentage of parasitism was 59.39% and 15.03%. in both areas, respectively. The per<;entage of died and lost eggs were 5.1 % and 1.8% in the treated plots in comparison 'with 5.5% and 1.9% in untreated ones, in arrangement. The hatchability % of O. nub"a/is eggs was 12.6 in the treated area and 55.8 in untreated one. The percentage of parasitoid emergence hole from O. nubi/alis eggs ranged 72 to 80%. The role of predation with the natural predators on suppressing 9. nubi/alis egg population were also determined. Direct observation of the predators on maize plants showed the presence of Cocclne//a undecimpunctata L., Paederus a/fieri; Kock., Lapidurs riparia Pail., Chrysoperla csme« (Steph.), Syrphus corrollae F., and Scymnus subviJ/osus The percentage of predation ranged 18.61 to 21.8% d ring both seasons. | ||
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