In HDC project TF 148 (Thinning of apple flowers using chemicals sensitive to the environment) trials conducted at East Malling showed that common salt (sodium chloride) applied at full bloom of the spur buds was an effective thinner.
- Growers may be interested in applying common salt to small areas of orchard at a time when they would normally apply ATS.
- It is advisable to apply 12 g of common salt per litre of water applied at high volume.
- Although 16 g per litre of water is likely to be more effective, in view of the evidence from abroad that this may result in over-thinning, interested growers may like to compare the effects of the two rates in small areas of orchard.