Biological Control of Indianmeal Moth and Rice Weevil by Parasitoids with Reference to the Intraspecific Competition Pattern

Biological control of rice weevil, Sitophilus oryzae (L.), and Indianmeal moth, Plodia interpunctella (Hübner), by their parasitoids Anisopteromalus calandrae (Howard) and Bracon hebetor Say was examined while considering the intraspecific competition pattern of the pests. In both experimental and s...

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Bibliographic Details
Published inJournal of economic entomology Vol. 104; no. 2; pp. 693 - 701
Main Authors Nam, Youngwoo, Ji, Jeongyeon, Na, Ja Hyun, Chun, Yong Shik, Ryoo, Mun Il
Format Journal Article
LanguageEnglish
Published England Entomological Society of America 01.04.2011
Subjects
Animals
Anisopteromalus calandrae
biological control
Bracon hebetor
Competitive Behavior
correlation
Female
Host-Parasite Interactions
intraspecific competition
Larva - parasitology
Models, Biological
moths
Moths - parasitology
parasitoids
Pest Control, Biological
Plodia interpunctella
Population Density
Sitophilus oryzae
Wasps - physiology
Weevils - parasitology
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Summary:Biological control of rice weevil, Sitophilus oryzae (L.), and Indianmeal moth, Plodia interpunctella (Hübner), by their parasitoids Anisopteromalus calandrae (Howard) and Bracon hebetor Say was examined while considering the intraspecific competition pattern of the pests. In both experimental and simulation studies, A. calandrae was shown to suppress the rice weevil population, a contest type competitor, regardless of the parasitoid/weevil ratios tested. In contrast, B. hebetor only significantly suppressed the Indianmeal moth, a scramble type competitor, when the parasitoid/moth ratio was >0.05. At ratios lower than 0.05, the role of B. hebetor was negligible, and the correlation coefficients between the number of moths that had emerged and the parasitoid/moth ratio was estimated to be 0.07. The control efficiency of the two parasitoids with respect to the parasitoid/host ratio was estimated using a ratio-response model. To suppress the weevil density to a level that was only 10% of the current density, the ratio was estimated to be 0.02, whereas this value was 0.14 for the Indianmeal moth. However, for the continuous suppression of the Indianmeal moth, periodic and iterative introduction of B. hebetor was required.
Bibliography:http://dx.doi.org/10.1603/EC10242
ISSN:0022-0493
1938-291X
DOI:10.1603/EC10242