Abdel-Aziz,, S. (2003). 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, 28(5), 4067-4075. doi: 10.21608/jppp.2003.243523
Sahar Y. Abdel-Aziz,. "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, 28, 5, 2003, 4067-4075. doi: 10.21608/jppp.2003.243523
Abdel-Aziz,, S. (2003). '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, 28(5), pp. 4067-4075. doi: 10.21608/jppp.2003.243523
Abdel-Aziz,, S. 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, 2003; 28(5): 4067-4075. doi: 10.21608/jppp.2003.243523
EFFICACY OF THE EGG PARASITOID Trichogramma evanescens WESTW. FOR CONTROLLING THE EUROPEAN CORN BORER Ostrinia nubllalfs HBN. ON I MAIZE PLANTATION
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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