Why do the rust affected leaves of wheat crop turn chlorotic after washing of the rust- pustules due to rain which often appears like a nutrient deficiency ?

22 February 2013 1 7K Report

This is an on-field observation that when the rain washes the rust pustules off the affected wheat leaves then the attacked leaves appear cholorotic and necrotic at later stages. Can anybody explain the physiological process behind this phenomenon? Will the spray of propiconazol (TILT) fungicide be able to restore the partially cholorotic leaves?

Miles R Thomas

You can't wash rust pustules off a leaf. The infection is within the leaf, all you are washing off is the the outward appearance of the infection, probably just the mature spores. The leaf remains infected so that is why the chlorotic areas will still show and later die.

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