Palmolive registered detergent controls apple, cherry, and grape powdery mildew

• Published in: Canadian journal of plant science 2009-11, Vol.89 (6), p.1139-1147
• Main Authors: Sholberg, P L, Boule, J
• Format: Article
• Language: English
• Subjects: Erysiphe necator; Malus; Podosphaera leucotricha; Prunus; Salmonidae; Vitaceae
• ISSN: 0008-4220

Palmolive registered detergent applied in water was compared with the standard fungicide treatment for control of powdery mildew on apple [Podosphaera leucotricha (Ell. & Ev.) E.S. Salmon], cherry [P. clandestina (Wall.:Fr.) Lev.], and grape [Erysiphe necator (Schw.) Burrill]. Initial tests in the greenhouse with apple and grape seedlings showed that Palmolive registered was as effective as myclobutanil in preventing powdery mildew on leaves. In apple orchard trials conducted in 2004, 2005 and 2006 Palmolive registered detergent prevented powdery mildew on leaves, but caused fruit russetting when used at a rate higher than 5 mL L super(-1) through the growing season. The 10 mL L super(-1) rate reduced foliar powdery mildew in an apple and cherry nursery and in Pinot noir grapes, but caused russetting on grape berries. Further studies to determine optimum rates and spray timing will be required before it can be used safely on grapes. Studies on activity of Palmolive registered detergent on Cameo apple leaves showed that it had protectant, eradicant, and antisporulant properties comparable with myclobutanil if applied within 1 d before or after inoculation with P. leucotricha and had superior antisporulant properties when applied to 7-d-old lesions. Palmolive registered detergent, if used appropriately, could be an important component of an IPM strategy for control of powdery mildew on apple, cherry, and grape because it presents very little risk for the development of fungicide resistance.Original Abstract: Les auteurs ont compare l'aplication de detergent Palmolive registered dilue dans l'eau au fongicide usuel employe pour lutter contre le blanc du pommier [Podosphara leucotricha (Ell. & Ev.) E.S. Salmon], du cerisier [P. clandestina (Wall.:Fr.) Lev.] et de la vigne [Erysiphe necator (Schw.) Burrill]. Les essais initiaux en serre sur des plantules de pommier et de vigne revelent que le detergent previent l'apparition du blanc sur les feuilles aussi efficacement que le myclobutanil. Lors des essais realises dans des vergers en 2004, 2005 et 2006, le detergent Palmolive registered a prevenu l'apparition du blanc sur les feuilles, mais entraine le roussissement des fruits quand on l'utilise a un taux superieur a 5 mL par litre durant la periode de croissance. A 10 mL par litre, le detergent a attenue le blanc des feuilles dans une pepiniere de pommiers et de cerisiers ainsi que sur des ceps de >, mais a cause le roussissement des grains de rai