Maize weevil (Sitophilus
zeamais) causes extensive damage to stored maize (Zea mays),
particularly to grain stored on-farm without chemical protectants.
Breeding of maize varieties with improved weevil resistance, however,
is not practiced to any significant extent, because of uncertain
probability of success and because seed producers generally consider
storability of grain to be outside of their responsibility. The
Rockefeller Foundation-funded Weevil Project, at CIMMYT, has guided a
total of four graduate students through a progression of studies
investigating the genetics of weevil resistance and exploring
practical methods for breeding maize with increased resistance to
weevil. Important milestones within the five years of the project
have been: 1) Identification of significant genetic variation for
weevil resistance among regionally-adapted maize germplasm, 2)
Investigations of secondary traits for use in selecting maize with
weevil resistance, 3) Successful divergent selection for weevil
resistance in several maize populations, and 4) Ongoing investigations
of per se resistance relative to hybrid performance for maize
lines at various levels of inbreeding. This paper will summarize
recent results, describe on-going work, and offer recommendations
based on our current understanding of this important challenge. It is
clear from results to date that breeding for improved weevil
resistance is possible; it remains unclear, however, what breeding
method(s), if any, are practical, effective and feasible for
widespread use in maize breeding programs.