Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/260
Title: EFFECTIVENESS OF THE EGG PARASITOID TRICHOGRAMMA EVANESCENS PREVENTING RICE MOTH FROM INFESTING STORED BAGGED COMMODITIES
Authors: Adarkwah, Charles
Nyarko, G.
Opoku, Nelson
Badii, Benjamin K.
Addai, Isaac K.
Prozell, Sabine
Ulrichs, Christian
Scholler, Matthias
Keywords: Corcyra cephalonica
Jute
Paper
Bag
Trichogramma evanescens
Hymenoptera
Trichogrammatidae
Issue Date: 2015
Publisher: Elsevier
Abstract: Experiments were carried out in the laboratory with the aim of accessing the effectiveness and parasitism by Trichogramma evanescens to prevent Corcyra cephalonica from infesting rice in paper and jute bags. Eight small jute or paper bags filled with 5 kg of organic rice grains were prepared and the openings sealed. Sentinel egg cards were prepared with thirty fresh eggs of C. cephalonica glued onto small pieces of paper cardboard. Eight sentinel egg cards were introduced into a plastic box measuring 60 x 40 x 21 cm, i.e four cards on top surface of the bag and the box bottom, respectively. Approximately 500 adults of T. evanescens were released 10-30 cm away from the egg cards. The control boxes contained no parasitoids; there were five replicates for all treatments and controls. Two experimental conditions were tested, i) placing a single T. evanescens-release unit with sentinel egg cards placed every 3e4 days without any further replacement of the release unit for three weeks, ii) both new host eggs and T. evanescens release units were replaced every 3-4 days. Mean emergence of C. cephalonica was significantly (p > 0.001) suppressed by the release of T. evanescens. There was statistically no significant difference on the number of emerged moths on paper bag compared to jute bag. All sentinel egg patches were visited by T. evanescens. There was no correlation between the distance (10-30 cm) at which the sentinel egg cards were placed away from the T. evanescens release point and the number of parasitized C. cephalonica eggs. There was no decrease in parasitism over time. The results demonstrate that T. evanescens has the potential for host-location ability and parasitism of C. cephalonica both on paper and jute bags. This parasitoid could be a promising candidate for the biological control of moth pests in bagged stored products.
URI: http://hdl.handle.net/123456789/260
ISSN: 0022-474X
Appears in Collections:Faculty of Agriculture, Food and Consumer Sciences

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