Small patches of white powdery coating initially develop on both surfaces of the older leaves. Affected leaves turn purple then die. Stems, young leaves and pods are also covered with the powdery coating. The plant may also lose leaves too early in the season and produce seeds that are smaller than normal.
Links to other websites with information about chickpea diseases some of which have been included here:
Weidong Chen, Hari C. Sharma, Fred J. Muehlbauer, 2011. Compendium of Chickpea and Lentil Diseases and Pests. The American Phytopathological Society.
K.L. Bailey, B.D. Gossen, R.K. Gugel, R.A.A. Morrall, 2003. Diseases of Field Crops in Canada. The Canadian Phytopathological Society.