Although weaker iPhone sales were certainly the biggest contributor to Apple’s downturn in the March quarter, the Mac and iPad also failed to hold up their ends, an analyst contended today.

“The trend line in Mac sales has been worsening consistently over the past year, and [the growth rate] has now been below zero for the past two quarters,” said Jan Dawson, principal analyst at Jackdaw Research, in an analysis posted to the firm’s website Wednesday. “That’s significant, because for a time the Mac was offsetting shrinkage from the iPad, such that combined revenues from the two were rising or steady. Now that this aggregate number is also in the red, the declining iPhone sales just exacerbate the problem.”

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