| Titles |
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English :
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Effect of host and parasitoid density on the efficiency of Trichogramma evanescens (westwood) and Trichogramma brassicae (Bezdenko) (Hymenoptera: Trichogrammatidae)
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Arabic :
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تأثير كثافة كل من الطفيل والعائل علي الكفاءة التطفلية لترايكوجراما أيفانسيس وترايكوجراما براسيكا
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| Abstract |
Studies were carried out at Plant Protection Research Institute in 2005 to find out the effect of different host and parasitoid density levels on the efficiency of Trichogramma evanescens and T. brassicae. Eggs of pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae ) were used as a host for the two Trichogramma spp. Three different host densities viz., 150, 300 and 600 eggs of P. gossypiella were provided to 2, 4, and 8 females of the two parasitoid species, respectively in glass vials (4x8.5 cm). The highest percentage of parasitism was obtained when T. evanescens and T. brassicae densities were 8 females and introduced 150 P. gossypiella eggs. The percentages of parasitism were 95.27 and 94.27% for the two parasitoid species, respectively. Whereas, the lowest percentage of parasitism was obtained when the parasitoid density was 2 females and introduced 600 host eggs, as it was 13.86% for T. evanescens and 15.96% for T. brassicae. In case of T. evanescens, emergence percentages were statistically similar in all treatments and was above 91.73%. Whereas, emergence percentage of T. brassicae was decreased to 88.24% when the parasitoid density was 2 females/vial. Female ratio in offspring was higher (67.06%) when T, evanescens density was 2 females and decreased insignificantly to 64.84 and significantly to 59.16% when parasitoid density increased to 4 and 8 female/ vial, respectively. As for, T. brassicae, percentages of produced females were insignificantly different in all parasitoid densities. The percentage of super parasitism was artless or negligible at all T. evanescens densities as, it didn't heighten 2.56%. While T. brassicae females exhibited significantly higher percentage of super parasítism (4.58%), when introduced only 150 eggs for all parasitoid densities compared with all other treatments.
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| Publication year |
2008
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| Pages |
97-108
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| Availability location |
معهد بحوث وقاية النباتات
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| Availability number |
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| Organization Name |
Plant Protection Research Institute (PPRI)
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| City |
الجيزة
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| serial title |
المجلة المصرية للبحوث الزراعية
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| ISSN |
1110-6336
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| Author(s) from ARC |
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| Agris Categories |
Pests of plants
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AGROVOC
TERMS |
Density.
Emergence.
Hosts.
Parasitoids.
Trichogramma brassicae.
Trichogramma evanescens.
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| Publication Type |
Journal
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