Functional response of Telenomus busseolae (Hym.: Scelionidae) an egg parasitoid of the sugarcane stem borer, Sesamia nonagrioides (Lep.: Noctuidae) at different temperatures

Telenomus busseolae Gahan is the most important egg parasitoid of sugarcane stem borers in Iran. Laboratory experiments were conducted to evaluate the functional response of T. busseolae to egg densities of Sesamia nonagrioides (Lefebvre) under four different temperatures (20, 25, 30 and 35°C). Resu...

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Bibliographic Details
Published in:Biocontrol science and technology 2010, Vol.20 (5-6), p.631-640
Main Authors: Jamshidnia, A, Kharazi-Pakdel, A, Allahyari, H, Soleymannejadian, E
Format: Article
Language:English
Subjects:
biological control
biological control agents
equations
functional response
infection
insect control
insect pests
mathematical models
ova
parasitoids
plant pests
Saccharum officinarum
Sesamia nonagrioides
statistical analysis
sugarcane
Telenomus
Telenomus busseolae
temperature
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Summary:Telenomus busseolae Gahan is the most important egg parasitoid of sugarcane stem borers in Iran. Laboratory experiments were conducted to evaluate the functional response of T. busseolae to egg densities of Sesamia nonagrioides (Lefebvre) under four different temperatures (20, 25, 30 and 35°C). Results of logistic regression revealed a type III functional response for all temperatures tested and type of functional response was not affected by temperature. Roger's random parasite equation was fitted to observed data at 35°C. In the other data sets (collected data under 20, 25 and 30 °C) Roger's equation could not provide meaningful parameters, therefore Holling's disk equation was used to fit the data. The attack rate for T. busseolae varying from 0.001784 to 0.10704, 0.0026 to 0.152, 0.0024 to 0.144 and 0.000866 to 0.05196 per h and estimated handling times were 0.59, 0.50, 0.53 and 0.29 h at 20, 25, 30 and 35°C, respectively. Based on asymptotic 95% confidence intervals, functional response parameters did not differ significantly from 20 to 30°C, which indicates that handling time and attack rate are least affected by the temperature changes. The results suggest a similar performance of T. busseolae against S. nonagrioides eggs at temperatures of 20-30°C. These results show that T. busseolae is well adapted to temperature changes during the sugarcane growing season.
ISSN:0958-3157
1360-0478
DOI:10.1080/09583151003695902