Perhaps you should try some spelling variations:
leaves decrease » leaves increase (Expand search), lesions decrease (Expand search), changes decrease (Expand search)
cotton leaves » cotton leaf (Expand search), cotton lines (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
cdc cotton » ce cotton (Expand search), crude cotton (Expand search)
on python » in python (Expand search), of python (Expand search), _ python (Expand search)
code cdc » code cpc (Expand search), code ctn (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( code cdc cotton leaves decrease ) OR ( on python python python programming ))~.