INFLUENCE OF THE SOYBEAN SEED COAT UPON SEED INFESTATION AND DEVELOPMENT OF THE INSECT CALLOSOBRUCHUS MACULATUS - Soybean and Wheat Crops: Growth, Fertilization, and Yield - page 9

larvae that crossed the seed coat of the Conquista (10), UFV 20 Florestal (30), UFUS 2003
(32), UFUS 2005 (52) and commercial soybean (60) represents 17.5, 88, 66, 61.9 and 75% of
the eggs laid on each of these seed coats, respectively (Figure 1). These results showed
reductions up to 82.5% (Conquista cultivar) in the amount of larvae that reaches the seed
cotyledons, when compared to the bruchid performance onto the host cowpeas. All the larvae
that crossed the seed coat were found dead in the cotyledons surface (Figure 5L).
Figure 2. A - Time (days) consumed by the surviving larvae to perforate completely the soybean seed
coats. The data represent the mean of twelve larvae per experiment. B - Seed coat thickness (cm).
Measuremens were done in triplicate and the data are the mean of these results.