Development of ascochyta blight (Ascochyta rabiei) in chickpea as affected by host resistance and plant age uri icon

abstract

  • Ascochyta blight caused by Ascochytarabiei, is the most destructive disease in manychickpea growing countries. Disease developmentvaries with the growth stage and host resistance.Hence, disease development was studied in cvsICCX 810800 (resistant), ICCV 90201 (moderatelyresistant), C 235 (moderately susceptible), ICCV96029 and Pb 7 (susceptible) under controlledenvironment (ICRISAT, Patencheru) and field conditions(Dhaulakuan, Himachal Pradesh) at seedling,post-seedling, vegetative, flowering and poddingstages. Under controlled environment, the incubationperiod and terminal disease reaction (TDR) did notvary significantly at different growth stages againstvirulent isolate AB 4. Cultivars ICCX 810800,ICCV 90201 and C 235 showed a significantlylonger incubation period than the susceptible cv. Pb7. Cultivar ICCX 810800 showed slow diseaseprogress and the least TDR. Field experiments wereconducted during the 2003?2004 and 2004?2005growing seasons. During 2003?2004, TDR washigher in plants inoculated at podding and theflowering stage and the lowest disease reaction wasrecorded in ICCX 810800. A severe epidemicduring 2004?2005 was attributed to the favourabletemperature, humidity and well distributed highrainfall. TDR did not differ significantly at any ofthe growth stages in susceptible cvs ICCV 96029and Pb 7. With respect to seeding date and cultivar,the highest yield was recorded in the early-sowncrop (1,276.7 kg ha?1) and in ICCV 90201(1,799.3 kg ha?1), respectively. The yields weregreatly reduced in all the cultivars during 2004?2005 and the highest yield was recorded in ICCX810800 (524.7 kg ha?1). Integrated disease managementusing resistant cultivars, optimum sowingperiod and foliar application of fungicides willimprove chickpea production. The experiment undercontrolled environment and field conditions (duringthe epidemic year) showed a similar disease development

publication date

  • 2007
  • 2007