The potential for biocontrol in stored products in general, with specific attention to application of parasitoids against Sitophilus granarius in grain stores at low temperatures Abstract: (Your abstract must use 10pt Arial font and must not be longer than this box) Introduction: This presentation will give an overview of the current state of biocontrol in stored products. An EU-funded COST Action Working Group, active during 2000-2006. evaluated the possibilities in different sectors: grain stores, mills and bakeries, pasta factories, stored nuts and dried fruit, etc. Three situations were identified with the greatest potential for widespread application: (1) empty room treatment against mites, beetles and moths, (2) treatment of bulk commodities against Sitophilus spp. and mites, and (3) application of egg-parasitoids against moths in packaged products. As an example, results of research concerning the larval ectoparasitoid Lariophagus distinguendus (Hym.: Pteromalidae) for biological control of the granary weevil Sitophilus granarius (Col.: Curculionidae) will be presented. This weevil is an important pest in grain stores in cool temperate climates, e.g. Northern Europe. Here, aeration of stores is carried out in order to bring grain temperatures down to about 5°C in the first months after harvest. Investigations were conducted on the effect of low temperatures on L. distinguendus: a) life table parameters and parasitoid induced mortality (PIM) and b) survival during exposure to a simulated winter. Results: L. distinguendus can develop and reproduce at temperatures as low as 16°C. In addition, the parasitoid population did not seem to be affected by the low temperatures, as opposed to its host. Some mortality was observed in S. granarius after exposure to 6°C for >4 weeks. This indicates that L. distinguendus will be able to survive winter conditions and resume its activity when grain temperature increases in spring.
Biocontrol in stored products
Main Research Area:
International Congress of Entomology, Section 5.02, 2008