Evaluation of the value of sorghum midge resistant hybrids in the USA

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Title: Evaluation of the value of sorghum midge resistant hybrids in the USA
Author: Mutaliano, Joaquim Americo
Abstract: Sorghum (Sorghum bicolor [L .] Moench ) production in many areas of the world is reduced due to damage caused by sorghum midge (Stenodiplosis sorghicola ) . There are several methods of control to reduce losses due to sorghum midge , which include cultural practices , biological control , chemical control and resistant cultivars . The best long -term solution for sorghum midge control is the use of genetic resistance in cultivars and hybrids . Recently , sorghum midge resistant hybrids have been developed by several sorghum breeding programs , but there is limited information about agronomic performance relative to planting dates compared to susceptible standards . Thus , the objectives of this research project are : (1 ) to evaluate the value of sorghum midge resistant sorghum hybrids in the USA production system , (2 ) to confirm the presence of sorghum midge insect resistance in sorghum hybrids , and (3 ) to determine whether the resistance in eighteen sorghum hybrids is stable across two environments in Texas where sorghum midge is a damaging pest . Sorghum hybrids with different levels of resistance to sorghum midge were evaluated at College Station and Corpus Christi , Texas in 2003 and 2004 , using two different planting dates and the presence or absence of an insecticide treatment . Agronomic data , sorghum midge incidence ratings and number of adult midges , were determined for all entries . All entries designated as resistant did have some resistance compared to susceptible checks . Across all hybrids , grain yield was higher in sorghum with normal planting dates compared to late planting . Under midge pressure resistant hybrids performed better than susceptible hybrids , but lacking midge pressure the susceptible hybrids were higher performing . The use of midge resistant hybrids in commercial production is only warranted when producers are reasonably sure that midge will be a problem . Otherwise , they should continue to plant early using traditional hybrids .
URI: http : / /hdl .handle .net /1969 .1 /3149
Date: 2006-04-12

Citation

Evaluation of the value of sorghum midge resistant hybrids in the USA. Available electronically from http : / /hdl .handle .net /1969 .1 /3149 .

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