Abstract
Saccharine sorghum has been analyzed as a supplementary prime matter for ethanol production, especially during the sugarcane off-season period. However, it has proven to be highly susceptible to insect attacks during the cultivation cycle. The fall armyworm should be emphasized due to its voracity and high damage capacity enhanced by feeding-caused decrease in photosynthetic area. Current analysis studies the biology and determines the nutritional indexes of Spodoptera frugiperda in saccharine sorghum. Cultivars of saccharine sorghum BRS 506, BRS 509 and BRS 511were evaluated. Duration and survival of the egg, caterpillar, pre-pupal and pupal phases were determined, coupled to weight of pupae and caterpillar, life span, fecundity and pre-egg laying period. Although S. frugiperda completed its life cycle on cultivars BRS 506 and BRS 511, egg-laying and egg feasibility rates were low, whereas insects did not lay eggs on cultivar BRS 509. There was no significant difference in feeding intake by S. frugiperda among these three sorghum cultivars. Results suggest that saccharine sorghum is not a suitable host for S. frugiperda. Biological data reveal that the three saccharine sorghum cultivars are recommended for the grain production system since the number of specimens of the next generation is low or null.
Highlights
Saccharine sorghum [Sorghum bicolor (L.) Moench] is one of the most promising alternatives as a renewable prime matter for the production of ethanol due to its similarity with sugarcane (Saccharum officinarum L.) with its saccharine fleshy stem
The incubation period of S. frugiperda eggs fed on sorghum cultivars BRS 506 and BRS 511 during the larval phase lasted three days, with no significant differences (Table 1)
Since adults deposited few eggs coupled to low viability, it should be highlighted that the nutritional content of saccharine sorghum cultivars was not adequate for the fall armyworm
Summary
Saccharine sorghum [Sorghum bicolor (L.) Moench] is one of the most promising alternatives as a renewable prime matter for the production of ethanol due to its similarity with sugarcane (Saccharum officinarum L.) with its saccharine fleshy stem. It may be planted in places where sugarcane has failed to adapt itself, in rotation with other yearly crops and potentially planted in non-cultivated areas. Bagasse is a source of energy for industrialization, co-generation of electricity or animal forage It contributes for favorable energy balance, with primary strategy as a crop in renewable areas, with grinding period within 45 days (Teixeira et al, 1997; Emygdio, 2010; Parrella et al, 2011)
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