Michael Fitzmaurice (Roscommon-Galway, Independent) | Oireachtas source

Dr. Mullins spoke about crops being grown that needed two sprays while others needed ten. Will he elaborate on that as I cannot get my head around it. Generally, farmers would follow weather forecasts and be advised to spray potato crops to protect against blight. How does Dr. Mullins know not to spray at those times compared with every other farmer?