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- W178441180 abstract "THE STEMBORER, Diatraea saccharalis (F.) (Lepidoptera: Crambidae), is an important insect pest of sugarcane (Saccharum spp. hybrids) in Louisiana. Plant resistance is an effective control tactic; however, resistant varieties frequently yield less than their susceptible counterparts as those traits associated with resistance can be associated negatively with sucrose yields. New mechanisms of resistance may solve this dilemma and sugarcane progenitors may provide a source for these mechanisms. We first (Phase 1) investigated the likelihood of identifying new sources of stemborer resistance from sugarcane progenitors and then the feasibility of transferring that resistance into commercial phenotypes (Phase 2). In Phase 1 we evaluated 39 S. spontaneum clones by laboratory bioassay and found a wide range in resistance as measured by reduced larval weight (from 0.0 to 79.0 mg; P < 0.001). In Phase 2, conducted in the field, we evaluated 20 backcross generation 3 (BC3) progeny derived from crosses with a resistant and a susceptible S. spontaneum identified in Phase 1. There was little difference between the two population means for percent bored internodes (R = 19% ± 1; S = 21% ± 1). Results indicated that progenitors could provide a source of resistance to the stemborer, but there is the potential for having this resistance diluted before commercial phenotypes become available. Introduction The Louisiana sugarcane industry relies on integrated pest management (IPM) to control season-long infestations of its stemborer pest, Diatraea saccharalis (F.) (Lepidoptera: Crambidae). Judicious use of insecticides is the principal control tactic in this IPM program, but insecticides are expensive and they are becoming increasingly less attractive from an environmental and public relations perspective. Host plant resistance is also an important control tactic as well, but stemborer resistant varieties tend to yield less than susceptible clones as the basis of resistance is often attributed to traits negatively correlated with sucrose yields, e.g. fibre (White et al., 2006). Incorporating stemborer resistance from sugarcane progenitors has been suggested as a way of integrating new sources of resistance (possibly traits not negatively associated with sucrose yields) into commercial sugarcane varieties (Jackson and Dunckelman, 1975). We report findings from a study evaluating the feasibility of this approach to developing borer resistant varieties in our commercial breeding program." @default.
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- W178441180 date "2007-01-01" @default.
- W178441180 modified "2023-09-25" @default.
- W178441180 title "Introgressing new sources of sugarcane borer resistance: can theory become practice?" @default.
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