A report from Appcelerator has found that developers are turning their backs on Android and shifting back to Apple's iOS platform.

The research, conducted with the help of analyst firm IDC, surveyed 2,760 developers about their perceptions of mobile OS priorities and feature priorities, as well as their mobile development plans for 2011.

According to the report, "developer momentum is shifting back toward Apple as fragmentation and tepid interest in current Android tablets chip away at Google’s recent momentum gains".

Nearly two-thirds of those surveyed said that Microsoft, HP, RIM and Nokia had already been left behind in terms of app development and were unlikely to make up ground on iOS and Android.

The research found that 91 percent of developers were ‘very interested’ in iPhone development and 86 percent were very interested in developing for the iPad.

In contrast, reported interest in Android phones fell two points to 85 percent and Android tablets fell three points to 71 percent, after increasing twelve points in the first quarter of 2011.

When asked to explain why their interest in Android was on the wane, nearly two-thirds said that device fragmentation in Android poses the biggest risk to Android.

Other reasons given were weak initial traction in tablets and the multiple different Android app stores that had sprung up.

Opinion: Android needs its own walled garden

The problem of Android fragmentation has been cited as a potential stumbling block for Google's OS in the past.

"The growth in Android has come from a large number of mobile manufacturers finding it easy to adapt to various screen sizes, hardware features and unique user interfaces. This in itself causes fragmentation, with developers having to test across many devices and sometimes create device specific versions," said Ben Trewhella, CTO of Mubaloo, a development firm, back in February.