An Investigation of the Flight Behaviour of the Larger Grain Borer in Response to Synthetic Pheromone 1990

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Ministry of Agriculture
The recognition of dispersal as an obligatory phase in the life cycle of many pelts (Wellington 1983) and as an important process in their population dynamics and spread (Stinner et al 1983) has led to many investigations into insect flight behaviour. Interest has recently been shown in the larger grain borer, Prostephanus truncatus (Horn), following an outbreak of this pest in Africa in 1981 (Golob and Hodges 1982). It has been known as a pest of farm stored maize in Mexico and Central America for some time (Chittenden 1911), occurring sporadically and of erratic importance. In Africa it has assumed major importance, causing weight 101les of up to 34 percent in maize cobs stored for lix •months in Tanzania, with an average loss of 9 percent (Hodgel et al 1983a). Losses in stored cassava can be very high, up to 70 percent weight loss after four months storage (Hodges 1986). In comparison, 101les in East Africa caused by indigenous .storage pests such as Sitophilu. Zeamais Motlchulsky, s. oryzae Olivier and Sitotroga cerealella (Olivier), are typically in the range of two to lix percent per year (Hodges 1983).