Short communication. Screening of sorghum genotypes for resistance to damage caused by the stem borer Chilo partellus (Swinhoe)

K.N Marulasiddesha,G.K Rama Gouda,M Sankar

doi:10.5424/sjar/2007051-229

Abstract

Twenty sweet sorghum and three grain sorghum -Sorghum bicolor (L.) Moench- genotypes were tested for resistance to the damage caused by the sorghum stem borer Chilo partellus (Swinhoe) under infested field conditions in the Dharwad region of northern Karnataka, India. Five different types of damage were taken into account: leaf scraping, dead heart, pinhole, peduncle and stem tunnelling damage. Genotype SSV-7073 was found to be the most resistant with respect to all the damage types studied. In addition, the genotypes Nandyal, SSV-53, SSV-6928, HES-4 and IS-2312 showed little peduncle and stem tunnelling damage. These genotypes might be considered potentially resistant varieties and may serve as material of interest in sorghum improvement programmes.

Highlights

Stem borer infestation was recorded in the experimental plants and the damage caused by the larvae was evaluated taking into account: i) the number of plants showing leaf scraping damage, ii) dead heart damage 40 days after sowing (DAS), iii) the number of plants with pinhole damage at 50 DAS, iv) the number of plants with peduncle damage at panicle emergence, and v) the number of plants with stem tunnelling damage at harvest
Deshpande (1978) found no leaf scraping or dead heart damage in 15 sorghum genotypes when screening for resistance to C. partellus, but two genotypes, E-302 and E-303, showed lower stem tunnelling damage; these were reported as resistant to the stem borer
The TNAU (1976) studied promising sorghum varieties and hybrid genotypes under natural infestation conditions in the field and found leaf injury, dead heart and stem tunnelling damage to be very low among the genotypes tested

Summary

Introduction

En la región de Dharwad, en el norte de Karnataka (India) se evaluaron, en condiciones de campo, 20 genotipos de sorgo dulce y tres de sorgo de grano [Sorghum bicolor (L.) Moench], para estudiar los daños causados por el barrenador del tallo, Chilo partellus (Swinhoe). The aim of this work was to analyse 23 sorghum genotypes for their resistance to the sorghum stem borer, Chilo partellus.

Objectives

Results

Conclusion