Developmental period
Significant genotypic effects were found at all developmental
stages from L1 larvae to pupae for the time needed
to complete each stage. The mean duration of the L1
stage varied from 4.2 to 5.6 days. The mean duration of
the pre-pupal stage varied from 1.8 to 2.8 days, whereas
the mean duration of the pupal stage varied from 2.9 to
3.5 days (Table 2). There was no relation between the
resistance level and the duration of the L1 stage
(P = 0.36). As mentioned above, there were no data
for the resistant accessions, as no L1 larvae developed
to the L2 stage. The mean duration of the L2 stage
varied from 3.8 to 7.7 days. Again, significant differences
were observed, but without relation to the resistance
level. The same was true for the pre-pupal and the pupal
stages.