Spreader settings for Scotts manufactured spreaders are listed on the back of the bag.
The spreader setting for Scotts Southern Turf Builder when using the EZ Broadcast spreader by Republic is 3.5. If you are using the EZ Drop Spreader by Republic the spreader setting is 6.5.
The Scotts spreader has a dial on there they call a micrometer. The settings on the dial are tested specifically with their products and their spreader. I'm not sure how they compare as I've never seen the Sears spreader. The Scotts Company's consumer services division keeps a list of many spreader types and can often help with setting the spreader before applying their product. You may want to contact them. Look them up at www.scotts.com.
If you send an email to Scotts Consumer service they can actually send you the spreader settings you need. You can contact them through their website and they will email your spreader setting. https://www.scotts.com/smg/contactus/contactUs.jsp?navId=page900108&parentId=page900134
What is the Ortho Spreader 5000 for overseeding
Unfortunately, there is no conversion. The spreaders are calibrated differently.
Yes one can use Vigoro spread with a Scotts spreader. The amount of Vigoro spread that needs to be used must be correlated in retrospect with the size of the area needing the spread.
If you are using the Vigoro Ultra Turf Lawn Fertilizer(29-0-4) with the Scotts Standard Broadcast Spreader then the setting would be 5.
There is a conversion matrix on Earthway's site to get the conversion from a Scott's spreader to an Earthway spreader. It is easiest to add 10. For example, Scott's spreader set at 4 should be set at 14 for an Earthway spreader set.
The correct setting for an EZ broadcast spreader by republic is 3. Many persons have used this code and it has worked perfectly for them. Depending on what you are doing you can also use the number 4 setting.
Setting for scotts rotary spreader of 13-13-13 fertilizer?
Scotts makes a granular product called Scotts Grubex. It kills white grubs right after they hatch and it lasts for 4 months.