Antestia Bug (Antestiopsis intricata) as a Determining Factor of Coffee Berry Fall and Yield Loss at Tepi Coffee Plantation
1994
Mekuria Tadese | Milion Abeba | Teklemariam Erge (Institute of Agricultural Research, Addis Abeba (Ethiopia))
An alarming level of coffee berry shedding in Tepi area incited the researcher to determine whether Antestiposis intricata is involved in this phenomenon. The trial was conducted for three consecutive years (1988-1990). Insecticide sprayed and unsprayed plots were compared in a randomized complete block design with five replication. Dursban 48 percent EC at the rate of 1.25 It ha-1 was used on a weekly basis starting from 'pin head stage' until 50 percent ripening periods of coffee cherries. Coffee berry disease resistant selection 74, 140 was used through out the study period. Fallen berries were collected on a weekly basis and yield data was taken only in 1990. The number of berries dropped to the ground were highly significant between sprayed and unsprayed plots. A yield data indicated a loss of 1.2 qt ha-1 clean coffee, which was estimated to represent a crop loss of 9 percent. The peak berry fall seasons (June-July) closely coincided with periods of peak antestia population. There was a strong positive correlation (r=0.97, P0.01, n
显示更多 [+] 显示较少 [-]