Wojdyła Adam T
Research Institute of Pomology and Floriculture, Pomologiczna 18, 96-100 Skierniewice, Poland.
Meded Rijksuniv Gent Fak Landbouwkd Toegep Biol Wet. 2002;67(2):369-76.
The efficacy and eventual phytotoxicity of oils from rape, sunflower seed (vegetable oil) and paraffin (Atpolan 80 EC) in the control of Sphaerotheca pannosa var. rosae were evaluated on roses grown in greenhouse or plastic tunnel. Oils were applied curativelly as plant spray 4-times at 7-day-intervals in concentrations from 0.25 to 4%. All used oils, gave as good effect as triforine (standard) or even better. On shrubs protected with oils at concentrations 0.25% and 0.5%, disease symptoms were noted only sporadically. Rose shrubs sprayed with higher concentration of oils were almost completely protected. Efficacy of tested oils increased with their concentrations. Paraffin oil was better in the control of S. pannosa var. rosae than vegetable oils. After 2 oil applications at conc. 2% or higher, first phytotoxicity symptoms on leaves were noted, particularly during warm and sunny days. Observations of treated leaves, 24 h after spraying under microscope, showed that all tested oils caused hyphae and spores degeneration or their visible deformation suggesting partial loss of turgidity. Depends on oil concentrations used, sporadically regular and unchanged shape hyphae and spores were visible.
在温室或塑料大棚中种植的玫瑰上，评估了油菜、向日葵籽（植物油）和石蜡（Atpolan 80 EC）油剂对蔷薇单囊壳变种玫瑰白粉菌的防治效果及最终的植物毒性。油剂作为植物喷雾剂进行治疗性施用，每隔7天施用4次，浓度为0.25%至4%。所有使用的油剂效果与嗪氨灵（标准药剂）相当，甚至更好。在以0.25%和0.5%浓度的油剂保护的灌木上，仅偶尔观察到病害症状。喷洒较高浓度油剂的玫瑰灌木几乎得到完全保护。受试油剂的防治效果随浓度增加而提高。石蜡油在防治蔷薇单囊壳变种玫瑰白粉菌方面比植物油更好。在以2%或更高浓度施用2次油剂后，首次在叶片上观察到植物毒性症状，尤其是在温暖晴朗的天气。在显微镜下观察喷雾后24小时的处理叶片，发现所有受试油剂均导致菌丝和孢子退化或明显变形，表明部分细胞膨压丧失。根据所使用的油剂浓度，偶尔可见形状规则且未改变的菌丝和孢子。
