Sprout Suppression Series: 1,4-dimethylnaphthalene (DMN)
DMN is a volatile emitted by potato tubers that naturally inhibits sprouting and induces tuber cells undergoing division to stay at a resting stage. Marketed in synthetic form as 1,4Sight™, it is EU Annex 1 listed and has recently received national registrations in the Netherlands (2015), Austria (2015), Belgium (2017) and Germany, France, Poland and Ireland in 2018.
In Europe it has been used to effectively control sprouting in commercial processing and pre-pack stores. DMN offers flexibility, both in terms of application equipment that can be used and treatment conditions (six doses at up to 20 ml/t each, over the season)*. Because it is a volatile however, stores must remain sealed for 24 to 48 hours post application. Its efficacy when used in combination with other sprout suppressants was highlighted during the EAPR Post-Harvest Section Meeting held in Norwich in March and has also been demonstrated in Sutton Bridge storage trials.
The recent visit to European commercial stores by Sutton Bridge storage specialists (read full story here) has demonstrated the importance of DMN and its use in combination in a post-CIPC scenario. The active is awaiting registration in the UK.
*As per Dutch label. Other European labels may vary.