Biological parameters of the egg parasitoid Trissolcus grandis (Hym.: Scelionidae) on Eurygaster integriceps (Hem.: Scutelleridae)
Trissolcus grandis Thomson is a solitary egg parasitoid of Sunn pest, Eurygaster integriceps Puton. Although widely distributed, it has often been overlooked in field surveys. Our objectives were to develop an efficient rearing technique for T. grandis, and to determine the basic bionomics and demog...
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| Format: | Article |
| Language: | English |
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Entomological Society of Iran
2011-02-01
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| Series: | نامه انجمن حشرهشناسی ایران |
| Subjects: | |
| Online Access: | https://jesi.areeo.ac.ir/article_105421_0e22fd5eebabb8653fc3a853de7ad6dd.pdf |
| _version_ | 1797973153203355648 |
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| author | B. L. Parker M. Amir-Maafi |
| author_facet | B. L. Parker M. Amir-Maafi |
| author_sort | B. L. Parker |
| collection | DOAJ |
| description | Trissolcus grandis Thomson is a solitary egg parasitoid of Sunn pest, Eurygaster integriceps Puton. Although widely distributed, it has often been overlooked in field surveys. Our objectives were to develop an efficient rearing technique for T. grandis, and to determine the basic bionomics and demographic parameters, necessary for future augmentative biological control programs. Exposure of 0-4 h-old Sunn pest egg masses to parasitoids at 1:1, 2:1 and 3:1 host-parasitoid ratios resulted in a parasitism rate of > 80%. The results demonstrated that the age of the host and the exposure time affected parasitism rate. However, parasitism rate did not differ significantly among 24, 48 and 72 h-old Sunn pest eggs. The percent of emerged parasitoids during the 24-h host exposure period was relatively high when host eggs were 24 h old. Moreover, the mean sex ratio showed a definite trend, suggesting that host age had an effect on the sex ratio of the T. grandis offspring. The mean developmental time obtained as 11.091 ± 0.1 and 9.68 ± 0.15 d. for female and male progenies, respectively. The longevity of females was ~ 30% lower compared to that of males. The average net fecundity reached 181.83 eggs per female. On the other hand, a female laid averagely ~ 7 eggs per day. Similarly, the daily population increase and mean generation time were 34.2%, and 14.61 d, respectively. The developing population consisted of 99% immature (egg, larvae, pupa), and only 1% adults. The importance of these findings to the population biology of this parasitoid is discussed. |
| first_indexed | 2024-04-11T03:59:58Z |
| format | Article |
| id | doaj.art-7fb8fc3cba1d4e7990bd4c109b23de8f |
| institution | Directory Open Access Journal |
| issn | 0259-9996 2783-3968 |
| language | English |
| last_indexed | 2024-04-11T03:59:58Z |
| publishDate | 2011-02-01 |
| publisher | Entomological Society of Iran |
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| series | نامه انجمن حشرهشناسی ایران |
| spelling | doaj.art-7fb8fc3cba1d4e7990bd4c109b23de8f2023-01-01T23:34:21ZengEntomological Society of Iranنامه انجمن حشرهشناسی ایران0259-99962783-39682011-02-013026781105421Biological parameters of the egg parasitoid Trissolcus grandis (Hym.: Scelionidae) on Eurygaster integriceps (Hem.: Scutelleridae)B. L. ParkerM. Amir-MaafiTrissolcus grandis Thomson is a solitary egg parasitoid of Sunn pest, Eurygaster integriceps Puton. Although widely distributed, it has often been overlooked in field surveys. Our objectives were to develop an efficient rearing technique for T. grandis, and to determine the basic bionomics and demographic parameters, necessary for future augmentative biological control programs. Exposure of 0-4 h-old Sunn pest egg masses to parasitoids at 1:1, 2:1 and 3:1 host-parasitoid ratios resulted in a parasitism rate of > 80%. The results demonstrated that the age of the host and the exposure time affected parasitism rate. However, parasitism rate did not differ significantly among 24, 48 and 72 h-old Sunn pest eggs. The percent of emerged parasitoids during the 24-h host exposure period was relatively high when host eggs were 24 h old. Moreover, the mean sex ratio showed a definite trend, suggesting that host age had an effect on the sex ratio of the T. grandis offspring. The mean developmental time obtained as 11.091 ± 0.1 and 9.68 ± 0.15 d. for female and male progenies, respectively. The longevity of females was ~ 30% lower compared to that of males. The average net fecundity reached 181.83 eggs per female. On the other hand, a female laid averagely ~ 7 eggs per day. Similarly, the daily population increase and mean generation time were 34.2%, and 14.61 d, respectively. The developing population consisted of 99% immature (egg, larvae, pupa), and only 1% adults. The importance of these findings to the population biology of this parasitoid is discussed.https://jesi.areeo.ac.ir/article_105421_0e22fd5eebabb8653fc3a853de7ad6dd.pdftrissolcus grandisbiological controldemographicseurygaster integriceps |
| spellingShingle | B. L. Parker M. Amir-Maafi Biological parameters of the egg parasitoid Trissolcus grandis (Hym.: Scelionidae) on Eurygaster integriceps (Hem.: Scutelleridae) نامه انجمن حشرهشناسی ایران trissolcus grandis biological control demographics eurygaster integriceps |
| title | Biological parameters of the egg parasitoid Trissolcus grandis (Hym.: Scelionidae) on Eurygaster integriceps (Hem.: Scutelleridae) |
| title_full | Biological parameters of the egg parasitoid Trissolcus grandis (Hym.: Scelionidae) on Eurygaster integriceps (Hem.: Scutelleridae) |
| title_fullStr | Biological parameters of the egg parasitoid Trissolcus grandis (Hym.: Scelionidae) on Eurygaster integriceps (Hem.: Scutelleridae) |
| title_full_unstemmed | Biological parameters of the egg parasitoid Trissolcus grandis (Hym.: Scelionidae) on Eurygaster integriceps (Hem.: Scutelleridae) |
| title_short | Biological parameters of the egg parasitoid Trissolcus grandis (Hym.: Scelionidae) on Eurygaster integriceps (Hem.: Scutelleridae) |
| title_sort | biological parameters of the egg parasitoid trissolcus grandis hym scelionidae on eurygaster integriceps hem scutelleridae |
| topic | trissolcus grandis biological control demographics eurygaster integriceps |
| url | https://jesi.areeo.ac.ir/article_105421_0e22fd5eebabb8653fc3a853de7ad6dd.pdf |
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