Species richness and pest control complexity : Will multispecies infestations always require a „ multi - bioagent “ control ?

Cape Verde is an archipelago of ten islands located in the Atlantic Ocean, 750 km west of the Senegal coast. The country is largely dependent on cereals, importing around 70-90% of its needs, with maize being the most important with 60-70% of all cereals imported. The storage system comprises both bulk and bag storage. Two port terminal elevators in two distinct islands guarantee the receiving in bulk from ships and grain storage in bulk for variable periods. Stores along all islands guarantee an additional storage capacity as well as grain handling in bags. One of the port terminal elevators is located in Praia – the capital of Cape Verde – in the Santiago Island, and the other in Mindelo in the S. Vicente Island. Analysis of data from 1998 to 2000 of the Praia port terminal elevator showed that maize for human consumption, mostly white dent, was stored for longer periods than maize for animal feed, mostly yellow. The respective upper limits of allowed initial moisture content, for storage, of 12.5 %, /w and 14 %, /w were largely determinant on the storage length. Although the temperatures were recorded only daily, in some aerations it was possible to follow the cooling/heating front. In some situations, fumigation, bin transfer and aeration made it possible to extend the periods of storage in safe conditions. Insects and mites associated with stored products and their arthropod parasites and predators in Khuzestan province (Iran) B. Habibpour, K. Kamali, J. Meidani ...........................................................................89 Abstract During 1999–2000, a faunistic survey was conducted in Khuzestan province, Iran to collect and identify insects and mites, including pests and their natural enemies associated with stored products. The faunal studies provided a fundamental knowledge for a better understanding of ecological aspects. The identified species are listed in 3 categories: I) Destructive insects and mites, a total of 29 species from 20 families belonging to 8 orders were collected and identified; II) Insect predators and parasitoids, Xylocoris sp., Habrobracon hebetor, Habrobracon brevicornis, Choetospila elegans, Pteromalus spp., Anisopteromalus spp. Cephalonomia tarsalis, Laelius anthrenivorus; III) Predatory mites: Hypoaspis (Geolaelaps) aculeifer, H. (Pneumolaelaps) sclerotarsa , Proctolaelaps pygmaeus, Macrocheles sp., Acarapsis docta, Cheyletus malaccensis.