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Baffoe, Kwabena, 2011. Importance of temperature for the willow bodyguard Perilitus brevicollis. Second cycle, A1E. Uppsala: SLU, Dept. of Ecology



The influence of temperature on the performance of the willow bodyguard, Perilitus brevicollis Haliday, 1835 (Hymenoptera: Braconidae) as well as the impact of temperature and parasitism on its host feeding capacity were assessed. The study also aimed at identifying the similarities and differences among two populations (Swedish and Irish) with regards to parasitoid diversity, size and parasitism rate. To achieve the former objective of the study, P. brevicollis parasitized adult Phratora vulgatissima were reared under four constant temperatures (10, 15, 20, 25 ℃) in the laboratory. It was then revealed that: (i) development rate was faster at the higher temperatures and vice versa; (ii) larger adult parasitoid size were achieved at the lower temperature (10 ℃) and smaller at the highest temperatures (25 ℃); (iii) 20 ℃ was found to be an optimal temperature for survival; (iv) host feeding capacity was reduced by the combine effect of parasitism and temperature especially at the higher temperatures. To achieve the second objective, overwintering adult beetles were collected from two sites in Sweden and Ireland and were reared in the greenhouse. The result indicated that, P. brevicollis was common to the two countries with no other species identified. These results from the two experiments underlie the importance of temperature in rearing the parasitoid for biological control program as well as predicting the performance of the parasitoid in future climates. The result also serves as basis for choosing parasitoid to control Phratora beetles in different geographical areas.

Main title:Importance of temperature for the willow bodyguard Perilitus brevicollis
Authors:Baffoe, Kwabena
Supervisor:Stenberg, Johan and Dalin, Peter
Examiner:Nordlander, Göran
Series:Master's thesis, Department of Ecology
Volume/Sequential designation:2011:12
Year of Publication:2011
Level and depth descriptor:Second cycle, A1E
Student's programme affiliation:NM004 Ecology - Master's Programme 120 HEC
Supervising department:(NL, NJ) > Dept. of Ecology
Keywords:temperature, development rate, body size, development time, Braconidae, Perilitus brevicolis, Phratora vulgatissima, host-parasitoid interactions, bodyguard, biological control, Salix
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Subject. Use of subject categories until 2023-04-30.:Protection of plants - General aspects
Pests of plants
Animal ecology
Life sciences
Deposited On:22 Sep 2011 13:07
Metadata Last Modified:20 Apr 2012 14:22

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