Eyes open on sprout control

Potato growers need to be sure they take account of current crop condition when deciding chlorpropham (CIPC) applications, the BPC has warned. Don't wait for sprouts to appear before starting control programmes.

"Early-harvested crops should have had their first application of CIPC by now, or it should at least be on your planner," says Adrian Briddon from BPC's Sutton Bridge Experimental Unit (SBEU). "Check late-harvested crops carefully before applying CIPC. If they are already sprouting, be aware that any applications should be at a higher rate, in accordance with label recommendations. While more expensive, this cuts down the urgency for repeat applications and helps prevent later problems with residues."

CIPC is now subject to a Maximum Residue Limit (MRL) of ten parts per million and samples are tested as part of residue analysis undertaken on behalf of the Pesticides Safety Directorate. CIPC is still under review and all growers must be careful not to exceed the MRL, notes Mr Briddon. "It's vital that growers plan applications carefully and ensure they follow label recommendations."

Stored crops must be dry and skins cured before any application of CIPC commences. High levels of soil sticking to tubers will also reduce product efficacy. During temperature pull-down crops should be monitored on a daily basis, and condition checked regularly throughout the season.