Wenneker M, Kanne J
Applied Plant Research (WUR- PPO-fruit), P.O. Box 200, NL-6670 AE Zetten, The Netherlands.
Commun Agric Appl Biol Sci. 2010;75(4):563-8.
Powdery mildew (Sphaerotheca mors-uvae) severely infects young shoots, stems and fruits of gooseberry (Ribes uva-crispa). Environmental friendly and biological control measures are being sought throughout the world. Especially in organic gooseberry growing effective control measures are needed, because powdery mildew infections may result in a total loss of the crop. In organic currant growing the number of adequate control methods is very limited. Sulphur as a fungicide against powdery mildew in e.g. gooseberry or table grape growing is not recommendable due to possible bleaching of berries and scorching of tender shoots. Various bicarbonate salts are suggested as a good option to control powdery mildew. In a field trial the effect of potassium bicarbonate (Armicarb) on the on the control of powdery mildew of gooseberry was evaluated. Four treatments; i.e. two preventive strategies and two curative strategies, were applied. PLants were sprayed until runoff. The percent of infected fruits and disease severity were assessed. In the unsprayed control plots very high disease incidences were observed; on average more than 90% of the berries were infected with powdery mildew. The weekly (preventive) spray applications with potassium carbonate reduced the disease incidences on fruits significantly. On average approximately 10% of the fruits were affected by powdery mildew. However, the number of spray applications was high. In conclusion, our results indicate that applications of potassium bicarbonate (as Armicarb) are effective in reducing the incidence and severity of American powdery mildew in gooseberry. Early spray applications are necessary to protect berries against powdery mildew infections. Future research will focus on reducing the number of applications, e.g. warning models based on powdery mildew of rose (Sphaerotheca pannosa).
白粉病（葡萄钩丝壳菌）严重感染醋栗（醋栗）的嫩梢、茎和果实。世界各地都在寻求环保和生物防治措施。特别是在有机醋栗种植中，需要有效的防治措施，因为白粉病感染可能导致作物绝收。在有机醋栗种植中，合适的防治方法数量非常有限。由于可能导致浆果漂白和嫩梢烧焦，在醋栗或鲜食葡萄种植中，不建议使用硫磺作为防治白粉病的杀菌剂。各种碳酸氢盐被认为是防治白粉病的一个好选择。在一项田间试验中，评估了碳酸氢钾（Armicarb）对醋栗白粉病的防治效果。采用了四种处理方法，即两种预防策略和两种治疗策略。对植株进行喷雾直至径流。评估了感染果实的百分比和病情严重程度。在未喷雾的对照地块中，观察到非常高的发病率；平均而言，超过90%的浆果感染了白粉病。每周（预防性）喷施碳酸钾显著降低了果实上的发病率。平均约10%的果实受到白粉病影响。然而，喷雾次数较多。总之，我们的结果表明，喷施碳酸氢钾（作为Armicarb）可有效降低醋栗上美国白粉病的发病率和严重程度。早期喷雾对于保护浆果免受白粉病感染是必要的。未来的研究将集中在减少喷施次数上，例如基于玫瑰白粉病（蔷薇单囊壳菌）的预警模型。
