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Ministry of Agriculture, Food and Rural Affairs

Air Pollution Injury

High levels of ozone or sulfur dioxide may cause air pollution injury in watermelons.   

Affected leaves develop silvery-white stipple marks on the upper surface of the leaves.  They leaves may appear thick and leathery.  The new growth and higher areas of the field are most susceptible to air pollution injury.

Symptoms commonly follow periods of hot, humid weather and low air quality advisories.  Air pollution injury rarely impacts yield.

Ozone injury in watermelon Ozone injury in watermelon
Click to enlarge.