There have been about 5000 sheep including 400 lambs and 30 rams stolen from farms in the region.

The price of sheep sitting about $190 per head is making this crime more attractive compared to a couple of years ago when the average price was $30 per head.

Police report that it is increasing difficult to catch the culprits as most farmers don't realise the amount of sheep missing until they bring them in for shearing or drenching when a count is done.

In some cases these crimes are committed by neighbouring farmers.

After uncovering vital evidence, 15 police recently conducted a raid on a property in Moodiarrup, recovering 130 sheep.

Reports suggest the property, near Kojonup, was searched by the police from Narrogin and Kojonup police stations who allegedly uncovered up the stolen sheep that were subsequently removed from the property.

Earlier this year WA police had received up to 20 reports of stock theft of varying degrees throughout the Upper Great Southern region.

Wagin Police Sergeant Paul Lydiate said he would be interested in hearing from anyone that had missing sheep they believed had been stolen.

He urged any member of the public with information about sheep stealing to come forward as every little piece of information helps.

Another issue threatening the farming industry is the rise of green peach aphid numbers on canola crops that are moisture stressed.

The pests have a particular resilience to some chemicals used to combat them and the Department of Agriculture has asked farmers finding these aphids to contact them for advice on how to deal with them.

The good news for farmers is the fact that most of the region has had some much needed rain on the crops that were looking a little dry of late.

The Bureau of Meteorology predicts that the rain that has fallen this week will have lessened the occasional shower or two going into the weekend.