Potential of Hymenopteran larval and egg parasitoids to control stored-product beetle and moth infestation in jute bags. Issue 4 (August 2014)

• Record Type: Journal Article
• Authors: Adarkwah, C.; Ulrichs, C.; Schaarschmidt, S.; Badii, B.K.; Addai, I.K.; Obeng-Ofori, D.; Schöller, M.
• Is Part Of: Bulletin of entomological research. Volume 104:Issue 4(2014)
• Page Start: 534
• Page End: 542
• Publication Date: 2014-08
• Subjects: Entomology -- Periodicals; 595.7
• DOI: 10.1017/S0007485314000285
• Languages: English
• ISSNs: 0007-4853

Abstract

<abstract abstract-type="normal"> <title>Abstract</title> <p>The control of stored-product moths in bagged commodities is difficult because the developmental stages of the moths are protected by the bagging material from control measures such as the application of contact insecticides. Studies were carried out to assess the ability of Hymenopteran parasitoids to locate their hosts inside jute bags in the laboratory. The ability of different parasitoids to penetrate jute bags containing rice was investigated in a controlled climate chamber. Few <italic>Habrobracon hebetor</italic> (Say) (Hymenoptera: Braconidae) passed through the jute material while a high percentage of <italic>Lariophagus distinguendus</italic> (Förster), <italic>Anisopteromalus calandrae</italic> (Howard) (Hymenoptera: Pteromalidae), <italic>Theocolax elegans</italic> (Westwood) (Hymenoptera: Pteromalidae) and <italic>Trichogramma evanescens</italic> Westwood (Hymenoptera: Trichogrammatidae) were able to enter the Petri-dishes. Significantly more <italic>L. distinguendus</italic> and <italic>T. elegans</italic> entered compared to <italic>H. hebetor</italic>. There was significant difference in the mean percentage parasitoids invading depending on species. Head capsules and/or thorax widths were measured in order to determine whether the opening in the jute material would be large enough for entry of the parasitoids. These morphometric data differed depending on parasitoid species and sex. The parasitoid <italic>Venturia canescens</italic> (Gravenhorst) (Hymenoptera: Ichneumonidae) did not enter the bags, but located host larvae inside the jute bags and parasitized rice moths <italic>Corcyra cephalonica</italic> larvae by stinging through the jute material. <italic>Venturia canescens</italic> significantly reduced the number of <italic>C. cephalonica</italic> adults emerging from the bagged rice; therefore, it could be released in storage rooms containing bagged rice for biological control of <italic>C. cephalonica</italic>. The use of parasitoids to suppress stored-product insect pests in bagged commodities could become a valuable supplement to the use of synthetic pesticides.</p> </abstract>