Effect of weather parameters, host resistance and sowing date on disease severity and temporal dynamics of Fusarium wilt in chickpea (Cicer arietinum L.)

Annie Khanna Annie Khanna,Pankaj Kumar Pankaj Kumar,Kushal Raj Kushal Raj

doi:10.54386/jam.v24i1.1028

Abstract

Fusarium wilt incited by Fusarium oxysporum f. sp. ciceris is an economically damaging disease of chickpea (Cicer arietinum L.). Field experiments on epidemiological studies revealed that sowing during second fortnight of November curtailed the disease severity index (22.50 and 20.83% during 2018-19 and 2019-20, respectively) whereas, sowing during first fortnight of October enhanced the disease severity index (34.86 and 30.41%). The area under disease progress curve was significantly higher in susceptible variety JG 62 and was the least in resistant variety HC 1. The correlation analysis exhibited positive correlation of disease severity index with maximum and minimum temperature while negative correlation with relative humidity morning and evening, irrespective of date of sowing. The principal component analysis depicted resistance index, sowing time and weather parameters as positional factors in determining Fusarium wilt progression. In susceptible variety, Gompertz model was the best fitted model for simulating the Fusarium wilt epidemic over time.

Highlights

Fusarium wilt incited by Fusarium oxysporum f. sp. ciceris is an economically damaging disease of chickpea (Cicer arietinum L.)
The Principal component analysis (PCA) was applied on average data of 2018-19 and 2019-20 for number of days having temperature between 20-30°C (Td), number of days with relative humidity more than 60% (RHd), average Disease severity index (DSI), resistance index, days taken for disease initiation, area under the disease progress curve (AUDPC), variety and sowing time to assess the inter-relationship among the factors of disease variability
The disease development of Fusarium wilt was assessed by calculating area under the disease progress curve (AUDPC) by adopting standard procedure given by Van der Plank (1963)

Summary

Introduction

Fusarium wilt incited by Fusarium oxysporum f. sp. ciceris is an economically damaging disease of chickpea (Cicer arietinum L.). The PCA was applied on average data of 2018-19 and 2019-20 for number of days having temperature between 20-30°C (Td), number of days with relative humidity more than 60% (RHd), average DSI, resistance index, days taken for disease initiation, AUDPC, variety and sowing time to assess the inter-relationship among the factors of disease variability.

Results

Conclusion