Hi all
I would go with 1:1 to stimulate, 2:1 to put on weight.

Doug Somerville wrote:

White cane sugar probably remains the safest and most reliable nectar substitute for honey bees. The concentration and quantity are equally important. For colony stimulation in spring or when queen rearing, feed small quantities (1–2 L) every few days of a 1:1 concentration of sugar and water by volume. 

To provide stores for winter, a colony should be fed in the autumn with quantities of 5 to 10 litres on a regular basis (weekly) until the colony has sufficient processed sugar stored. For winter stores a ratio of 2 parts sugar to 1 part water is used to provide a thick syrup. Do not feed a sugar syrup mix thinner than a 1:1 ratio as bees have to do too much work to retrieve the sugar.

Feeding sugar to honey bees
August 2014, Primefact 1343 first edition, Doug Somerville, Technical Specialist Honey Bees Intensive Livestock, Goulburn
© State of New South Wales through the Department of Trade and Investment, Regional Infrastructure and Services 2014. You may copy, distribute and otherwise freely deal with this publication for any purpose, provided that you attribute the NSW Department of Primary Industries as the owner.

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