Rice Doctor- online and (mobile app) diagnostics tool for rice crop problems needs a logo

This is what Rice Doctor - Diagnose and manage your crop problems was looking for in their logo design

The International Rice Research Institute needs a logo for their Rice Doctor, an online diagnostics key for diagnosing rice crop pest and disease (and also some other like nutrients or environmental) problems. In the future this tool will also give recommendations what to do about the diagnosed problem. The tool already exists online( http://www.knowledgebank.irri.org/ ) however, is currently undergoing an overhaul. It will be developed as a web based tool, with mobile app versions available in the future.
The logo we came up with so far can be seen here: http://54.243.234.203/Ricedoctest/Ricedoctest.html , however, we do not really like the design and would like to get some fresh ideas in. We choose the stethoscope as a symbol for diagnostics, however, this is just an idea and we are not too concerned if it gets removed. for a general colour scheme (different types of green) and fonts please see our main website www.irri.org

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