Thermal requirements of Trissolcus grandis (Hymenoptera: Scelionidae), an egg parasitoid of sunn pest

Title:

Thermal requirements of Trissolcus grandis (Hymenoptera: Scelionidae), an egg parasitoid of sunn pest

Creator:

Iranipour, Shahzad, Nozad Bonab , Zahra, and Michaud, John P.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:0b27d053-8f22-44c6-81d0-04230e10f9f4
uuid:0b27d053-8f22-44c6-81d0-04230e10f9f4

Subject:

Hymenoptera: Scelionidae, Trissolcus grandis, egg prasitoid, Hemiptera, Scutelleridae, Eurygaster integriceps, degree-day, development, sunn pest, fecundity, longevity, thermal constant, and thermal treshold

Type:

article, model:article, and TEXT

Description:

Trissolcus grandis is an important egg parasitoid of sunn pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae), the most serious pest of wheat in Iran. The thermal requirements of two populations of T. grandis were studied at five constant temperatures ranging from 20-32°C. Thermal thresholds for development were calculated using linear regression and degree-day models were determined by fitting non-linear equations to the data. The lower threshold for development was estimated to be 12.5 and 12.1°C, respectively, for males and females of the Bonab population, compared to 14.4 and 14.5°C for those of the Qaramalek population. Complete development required 143.8 and 162.8 degree-days, respectively, for males and females of the Bonab population and 116.9 and 124.6 for those of the Qaramalek population. Thus, wasps from the warmer region (Qaramalek) developed faster than those from the cooler region (Bonab), but had a higher thermal threshold for initiating development. Bonab females attained their highest fecundity (117.7 ± 7.2) at the lowest temperature tested (20°C), whereas the fecundity of Qaramalek females was maximal (96.8 ± 11.5) at 26°C. Biological control programmes that seek to augment wasp populations in wheat fields early in the spring, when natural rates of sunn pest parasitism tend to be low, should consider wasp thermal requirements to ensure the selection and release of locally-adapted parasitoids.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

European Journal of Entomology | 2010 Volume:107 | Number:1

Harvested from:

CDK

Metadata only:

false