SCREENING OF SOME SORGHUM GENOTYPES FOR RESISTANCE TO SORGHUM MIDGE, STENODIPLOSIS (= CONTARINIA) SORGHICOLA COQILLET (DIPTERA: CECIDOMYIIDAE) UNDER GEDARIF RAINFED CONDITIONS

Abstract

Preliminary experiments were conducted at Northern area,
Gedarif State during seasons of 2002-03, 2006-07.Where as
advanced trials during 2008/2009 to 2012/2013 at northern and
Southern areas. The objective was to evaluate selected sorghum
genotypes for sorghum midge resistance. A total of 3000
accessions were obtained from Gene Bank Resources. Resistant
genotype, DJ 6514 (Resistant Check already released in 2007)
was obtained from International Crops Research Institute for the
Semi-Arid Tropics (ICRISAT). Result showed that the midge 

damage rating was significantly different among genotypes. The
midge damage rating scores ranged between, 1.3- 8.6; 1.1- 9.2;
1.4- 9.0; 1.1 – 9.4; and 1.2- 9.2 for all seasons (2008/09;
2009/10; 2010/11; 2011/12 and 2012/13). However, the lowest
midge damage rating was recorded by DJ 6514 (Resistant
check), followed by P₁ 570162 (Hag Abbakar); GBM 30 (Early
Feterita); Wad Baco; and Safra (1.4; 1.5; 1.5, 1.6 and 1.7),
respectively. Genotypes, P₁ 570162 (Hag Abbakar); GBM 30
(Early Feterita); Wad Baco; Safra and Harerai showed lowest %
yield loss and performed similar to the resistant check (14.2;
14.5; 14.5; 17.0 and 17.3%), respectively. The combined
analysis showed that a significant difference was observed
between genotypes. The genotypes were significantly different
in panicle types, compact and semi-compact headed genotypes
showed lower % glumes coverage (1.3- 4.5%), while semicompact

headed genotypes ranged between 5.5 – 7.8%.
Genotypes, Wad Baco; P₁ 570162 (Hag Abbakar); GBM 30
(Early Feterita); Safra; Wad Ahmed; Harerai and Wad Akar
showed the shortest glumes coverage (1.3; 1.3; 1.5; 1.5; 1.6; 1.7
and 1.8 %). Compact headed genotypes recorded lowest midge
density (6.5 adults/ 5 heads), while the semi-compact headed
genotypes were recorded 15.7 adults/ 5 heads compared with
others types of heads.