PSD approves use of Valbon on bulb onions following trials

Growers now have a new option for the control of downy mildew with the granting of a specific off-label approval (SOLA) by the Pesticides Safety Directorate (PSD) for the use of Valbon (benthiavalicarb-isopropyl + mancozeb) on bulb onions and shallots.

The SOLA has been given following independent trials in 2005 and 2006 by the Allium & Brassica Centre (ABC), funded by the HDC.

Trials by Certis also demonstrated that Valbon has useful activity on downy mildew (Peronospora destructor), as well as botrytis leaf spot (Botrytis squamosa).

Valbon has been used successfully on potatoes for the control of blight. It contains two active ingredients, benthiavalicarb and mancozeb, and has good translaminar and local systemic activity with preventative and curative activity. It is rainfast within one hour.

ABC director Andy Richardson recommended using Valbon earlier in spray programmes due to the 28-day harvest interval: "We intend to use it for sprays two and four in our eight-spray programme. Trials have shown that it provides good results when used earlier," he said.


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