caa a22 4500 388105720 CHVBK 20180307125336.0 cr unu---uuuuu 161130e199909 xx s 000 0 eng 10.1017/S1742758400019408 doi S1742758400019408 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400019408 Wale Melaku Institute of Agricultural Research, P.O. Box 2003, Addis Ababa, Ethiopia, E-mail: iar@telecom.net.et Population Dynamics of the Stemborers Chilo partellus (Swinhoe), Busseola fusca (Fuller) and Sesamia calamistis Attacking Sorghum in Central Ethiopia [Elektronische Daten] [Melaku Wale] Studies on the population dynamics and species composition of the sorghum stemborers Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae), Busseola fusca (Fuller) (Lepidoptera: Noctuidae) and Sesamia sp. were conducted at Melkassa, Rift Valley of Ethiopia, during the 1990 and 1992 cropping seasons. Chilo partellus at 92% dominated the species composition. Busseola frisca made up 7.7% and Sesamia calamistis less than 1% of the borers. Occurrence of partellus declined with delay in planting until the third planting ( early June to early July) then increased during late planting in July. Busseola fusca alone, however, tended to increase in numbers with delay in planting. In Melkassa area, early planting in July could be considered as the most suitable, with low borer numbers, damage symptoms and resulting in fewer stalks with peduncle damage. Grain yield was also higher during early planting in July while the lowest yield was obtained during late planting in July. Weather factors showed no consistency but relative humidity seemed to have a significantly negative correlation with insect numbers in the last two plantings in 1992. Copyright © ICIPE 1999 population dynamics nationallicence planting date nationallicence Chilo partellus nationallicence Busseola fusca nationallicence sorghum nationallicence Ethiopia nationallicence dynamique de populations nationallicence dates de semis nationallicence Chilo partellus nationallicence Busseolafusca nationallicence sorgho nationallicence Ethiopie nationallicence International Journal of Tropical Insect Science Cambridge University Press 19/2-3(1999-09), 149-156 1742-7584 19:2-3<149 1999 19 JTI https://doi.org/10.1017/S1742758400019408 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400019408 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Wale Melaku Institute of Agricultural Research, P.O. Box 2003, Addis Ababa, Ethiopia, E-mail: iar@telecom.net.et NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 19/2-3(1999-09), 149-156 1742-7584 19:2-3<149 1999 19 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge