Do you need to change the products because of resistance and if yes how many products Roland 2013/1/7 J. Agoston <agoston.janos123@gmail.com>: > isopyrazam -- R de Boer La Maugardiere 1 F 27260 EPAIGNES FRANCE Phone./Fax 0033-232-576-204 Email: bulborum@gmail.com