PIRSA's latest Crop and Pasture Report says crops in many districts now have good yield potential, however timely spring rains and ongoing mild temperatures will be needed to maintain growth.

The August report, compiled by Peter Fulwood of Rural Solutions SA, says growers faced fairly good conditions during August, with monthly rainfall generally around average in most parts and totals ranging from 50-100mm in the south down to 25-50mm in northern areas.

"Good rains during July and August in most districts enabled crops to maintain growth, although colder, frosty conditions did slow crop development," Mr Fulwood said.

While this cooler weather had slowed growth, many crops were doing well with the total crop area estimated to be 4.02 million hectares and crop production currently estimated at 6.49 million tonnes.

Mr Fulwood said paddock feed was quite adequate for stock requirements and will increase as temperatures rise during spring.

"Some farmers are already starting to prepare paddocks for hay/silage to replenish on-farm stocks this spring," he said.

Foliar diseases appeared to be at manageable levels, but Mr Fulwood warned farmers that with some fungicides in short supply, they will need to start planning ahead to ensure they have sufficient stocks for future requirements.