Abstract
This study evaluated the effects of the sugarcane borer Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae) on cultivars of sweet and biomass sorghum for the selection of resistant cultivars. The present work consisted of two trials, with natural pest infestation. In the first one, 10 sweet sorghum cultivars were analyzed for the following variables: plant height, number of healthy and damaged internodes, gallery position and size, stem infestation level and soluble solids content (°Brix). In the second trial, it was analyzed 16 genotypes of high biomass sorghum, with the same variables above mentioned, in addition to the lignin, cellulose and hemicellulose contents. Among sweet sorghum genotypes evaluated, the genotype CMSXS647 stood out due to the traits: plant height, infestation level, gallery size and soluble solids content. Among the sorghum genotypes evaluated, CMSXS7030, CMSXS7012 and CMSXS7028 presented ideal characteristics for infestation level, plant height and number of lignocellulosic compounds. Such information, in addition to supporting the bioenergy sorghum breeding program, will assist in integrated pest management for sorghum cultivation.
Highlights
The growing demand for energy, excessive consumption of fossil fuels and climate change has been boosting research for renewable energy sources
The present study evaluated the resistance of genotypes of sweet sorghum and high biomass sorghum to D. saccharalis, as well as the effect of earlier harvesting sweet sorghum for potential damage reduction
We evaluated 16 sorghum genotypes, including 14 experimental genotypes of high biomass sorghum belonging to Embrapa Milho e Sorgo breeding program (CMSXS7021, CMSXS7022, CMSXS7023, CMSXS7024, CMSXS7025, CMSXS7026, CMSXS7027, CMSXS7028, CMSXS7029, CMSXS7030, CMSXS7031, CMSXS7012, CMSXS7015 and CMSXS7016) and two commercial forage sorghum hybrids (BRS655 and Volumax®) considered as controls
Summary
The growing demand for energy, excessive consumption of fossil fuels and climate change has been boosting research for renewable energy sources. Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae) is a polyphagous pest of economic importance in various crops, where it makes physical injury the plant stems. In sorghum, it has become one of the most important pests, due to its destructive potential and difficult to control, mainly due to the drilling habit of larvae and due to the scarcity of products registered for this purpose (BRASIL, 2017). It has become one of the most important pests, due to its destructive potential and difficult to control, mainly due to the drilling habit of larvae and due to the scarcity of products registered for this purpose (BRASIL, 2017) This pest harms all stages of plant development. The present study evaluated the resistance of genotypes of sweet sorghum and high biomass sorghum to D. saccharalis, as well as the effect of earlier harvesting sweet sorghum for potential damage reduction
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