CROP DISEASE CONTROL BY SPRAYING ELECTROLYZED STRONG ACID WATER IN PROTECTED CULTIVATION

研究了喷施电解强酸性水（ESAW ; pH：2.8，游离有效氯浓度（ECC）：32 ppm，氧化还原电位（ORP）：1120 mV）对生长在塑料大棚中的黄瓜叶片上/中的白粉病和霜霉病发病率的影响，所述电解强酸性水通过电解NaCl稀水溶液获得。每隔三天或四天将不同量的ESAW或井水喷洒到叶片上一次。黄瓜叶片上的白粉病的发病率显着降低，在第11天喷洒1和2L的ESAW每株与对照相比（不喷洒），和喷洒4L的，与井水和对照相比。用ESAW防治霜霉病，无论喷多少，均能控制霜霉病发病25天，对井水防效10天以上，对对照防效7天以上。然而，喷洒ESAW在15天后的一些叶片中引起了类似于叶烧的生理障碍， ...更多信息 在第25天，无论喷雾量如何，百分比都达到约50%。这些结果表明，ESAW可用于防治某些作物病害，并可作为某些农药的可行替代品或有效减少某些农药的施用量和/或频率，但仍存在类似于叶烧的生理障碍的问题。在大棚内，每隔3 ~ 4d对番茄叶片喷施pH调节水、ECC调节水和蒸馏水，研究ESAW对番茄叶部烧伤样生理障碍发生的影响，为阐明ESAW控制作物病害的主要因素奠定基础。结果表明，pH值小于2.7和ECC大于20 ppm的主效应均达显著水平，且二者对番茄白粉病的防治存在正交互作用。但各调控沃茨喷雾处理的灰霉病严重程度与对照无显著差异。在ECCs大于20 ppm或pH小于2.7的所有调节沃茨中，在一些叶片中观察到类似于叶烧的生理障碍。少

Effects were investigated of spraying electrolyzed strong acid water (ESAW ; pH : 2.8, free effective chlorine concentration (ECC) : 32 ppm, oxidation-reduction potential (ORP) : 1120 mV), which was obtained by electrolysis of a NaCl dilute water solution, on the incidence of powdery mildew and downy mildew on/in leaves of cucumber grown in a plastic house. Different amounts of the ESAW or well water were sprayd onto the leaves once every third or fourth day. The incidence of powdery mildew on cucumber leaves was significantly reduced on day 11 by spraying 1 and 2l of ESAW per plant compared with control (no spray) ; and spraying 4l of that compared with well water and control. The incidence of downy mildew was controlled for 25 days by spraying the ESAW regardless of the amount sprayd and was delayd more than 10 days against well water and more than 7 days against control. However, spraying the ESAW caused a leaf-burn-like physiological disorder in some leaves after day 15 and the per … More centage reached around 50% on day 25 regardless of the amount sprayd. These results indicate that ESAW can be used for controlling some crop diseases and can be then a viable alternative for some agricultural chemicals or be effective in reducing application amounts and/or frequencies of some agricultural chemicals although there remains the problem of a leaf-burn-like physiological disorder.Effects of spraying waters with different pHs and ECCs on the disease severity of powdery mildew and gray mold, and on the incidence of a leaf-burn-like physiological disorder were also investigated as a fundamental research to clarify the main factor controlling crop diseases by ESAW.pH-regulated water, ECC-regulated water, or distillled water was sprayd at intervals of 3 or 4 days on leaves of tomato grown in a plastic house. A statistical analysis of the results showed that main effects of pHs lower than 2.7 and ECC more than 20ppm were significant individually, and that there was a positive interaction between the two factors on the control of powdery mildew oll tomato leaves. However, there were no significant differences in the disease severity of gray mold among all the regulated waters sprayd and control. The leaf-burn-like physiological disorder was observed in some leaves with all the regulated waters with ECCs of more than 20 ppm or with pHs of less than 2.7. Less