oa African Entomology - Seasonal night activity of the maize stalk borer, Busseola fusca (Fuller) (Lepidoptera: Noctuidae), in Lesotho



Seasonal flight activity of Busseola fusca (Fuller) was monitored at six localities in Lesotho during the 1995/96, 1996/97 and 1997/98 growing seasons, using a sex pheromone monitoring system. There were distinct periods of flight activity, with seasonal flight generally commencing in October and ending in Mayor earlier in the high-lying regions. There are three generations of B. fusca per year in the low-lying areas, while 2-3 generations have been recorded in the mountain regions. The first, second and third generation flights usually peaked in November, February and April, respectively. The observed differences between the low-lying areas and the mountains, both in terms of cessation of seasonal flight activity and number of generations per year, were attributed to variations in the duration of the growing season (longer in the lowlands than in the mountains). There was also a north-south decrease in the magnitude of individual flights in the lowlands. This was attributed to a north-south decrease in average annual summer rainfall.


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