David Hula enjoys a good competition. An array of trophies, plaques and certificates of achievement won by growing high corn yields over the past decade-plus attest to that. But Hula is also known in farming circles for his generosity and commitment to sharing tough lessons learned in cornfields, the school of hard knocks, with other growers who might benefit. It’s why the world champion corn grower has unapologetically talked up the benefits of fungicide use this season to any farmer withi...