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Paper Information

Journal:   APPLIED ENTOMOLOGY AND PHYTOPATHOLOGY   March 2002 , Volume 69 , Number 2; Page(s) 97 To 110.
 
Paper: 

FUNCTIONAL AND NUMERICAL RESPONSES OF SUNN PEST EGG PARASITOID, TRISSOLCUS SEMISTRIATUS, REARED ON EURYGASTER INTEGRICEPS AND GRAPHOSOMA LINEATUM

 
 
Author(s):  ASGARI SH., KAMALI K., FATHIPOUR Y., SAHRAGARD A., SOLEYMANNEZHADIAN E.
 
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Abstract: 

Sunn pest egg parasitoid, Trissolcus semistriatus (Hym., Scelionidae), was reared on eggs of two species of bugs, Graphosoma lineaturn (Het.. Pentatomidae) (Ts-Gr) and Eurygaster integriceps (Het., Scutelleridae) (Ts-Eu), for two generations. Functional and numerical responses of the two groups were compared.A one day old female parasitoid of the two groups were introduced to 8 density levels (2, 4, 7, 14, 28, 42, 56 and 70) of one day old eggs of Sunn pest, E. integriceps. in 9 replicates for 8 hrs. Experiments conducted at 25± 0.5°C, 45±5% RH and l6L:8D h photoperiod. Type II and III functional responses were shown by Ts-Eu and Ts-Gr, respectively. Ts-Eu had higher searching efficiency (a) and lower handling time (Th) than Ts-Gr. Maximum attack rate (T/Th)reached 63.49 and 20.25 for Ts- Eu and Ts-Gr. respectively. Numerical response ofTs-Eu to cumulative densities of host eggs was linearly increasing, but was domed shape for Ts-Gr.

 
Keyword(s): TRISSOLCUS SEMISTRIATUS, EURYGASTER INTEGRICEPS, GRAPHOSOMA LINEATUM, FUNCTIONAL RESPONSE, NUMERICAL RESPONSE
 
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