WHILE varietal susceptibility to lodging is a key factor to consider with PGR applications this spring, a new on-line PGR calculator allows growers to assess more detailed variety specific information on susceptibility to lodging.

Syngenta's field technical manager, James Southgate, said that understanding specific varieties’ strengths and weaknesses for root or stem lodging can prove invaluable in tailoring PGR requirements.

InSpire is the PGR decision-making support tool from Syngenta and it is designed to tailor treatment timing and options to best meet individual in-field situations.

He cited the example of the wheat variety Grafton, where the description of a short, stronger-strawed variety would indicate low risk of lodging. However, Harper Adams University studies by Dr Mitch Crook had identified the variety typically does not score well for root anchorage.

“Using that information in InSpire, the in-field implication is that Grafton will benefit more from an emphasis on Moddus application at T0, to encourage greater root development,” pointed out Mr Southgate. “That could be particularly relevant this season, where wet weather has further affected root development.

“In contrast, the variety Revelation is far better at developing good root anchorage, but has a weak centre of gravity and more susceptible to stem lodging,” he added.

“Whilst both varieties have similar Recommended List scores for lodging risk, InSpire differentiates and devises the most appropriate options in specific situations.”

The on-line tool combines variety profiling with other factors that influence PGR use – such as sowing date, soil type, weather conditions and yield potential – to give an instant recommendation on what to apply and when.

* To try out InSpire, visit: www.syngenta.co.uk/PGR-decision-tool