Inheritance of resistance to maize weevil Sitophilus zeamais (Motschulsky) in maize inbred lines and determination of their heterotic groups
Abstract
172 words
Maize weevil Sitophilus zeamais (Motschulsky) is a pest of
maize causing serious losses to resource-poor farmers in the
tropics. To combine resistance to Maize Weevil with high yield
in maize, 52 inbred lines reported to harbor resistance were
crossed to tester A and B and resultant progenies evaluated in
different locations for yield. GENSTAT statistical package 12th
edition revealed highly significant differences among entries
for diseases and other important agronomic traits. Analysis of
GCA and SCA showed that additive effects were more
important than non additive for most of these traits. Additive
and non additive effects had equal importance for response to
yield in Namulonge, whereas SCA effects were more important
in Masaka. Inbred lines were assigned to their heterotic groups.
Across site analysis of GxE for yield revealed that the
testcrosses were environment specific (p<0.01). Weevil
resistance study involved the inbred parents, ten top best crosses
obtained from lines with tester A and B as well as their opposite
crosses. Thirty-two young adult weevils were used to infest
50-g maize samples.
Subjects
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