How Ragweed conqured The Who.

The Who, slated to play the Pepsi Center on Sunday, September 29, has announced that it's postponing the concert.

The reason? Illness, according to a statement on the band's website.

The news came days after the group was forced to end its Houston concert early after Roger Daltrey lost his voice, blaming ragweed allergies.

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"Less than an hour into the set, the band’s legendary vocalist Roger Daltrey called it a night," according to the Houston Press, our sister publication. "He was unable to sing thanks to ragweed allergies. So, it’s not just torrential downpours which affect shows here, friends, it’s also our uncontrollable pollen count."

The show, which included a fifty-piece backing orchestra, lasted through eight songs and was stopped around 45 minutes in. Pete Townshend promised Houston fans the band would make good on the truncated concert.

Whatever was going on with Daltrey's voice has temporarily derailed the tour. The band went on to cancel its September 27 gig in Dallas and September 29 gig in Denver.

"Unfortunately due to illness, The Who concert in Denver on Sunday, September 29, must be postponed," the band wrote on its website. "Fans should hold on to their tickets for the Denver show as they will be honored at the rescheduled date. Please stay tuned for further information."