Evaluation of the Incidence and Severity of Olive Leaf Spot Caused by <i>Spilocaea oleagina</i>on Olive Trees in Palestine

Olive Leaf Spot (OLS) is found in many parts of the world and cause readuced growth and yield in olive trees. In this study, investigations were carried out to measure the incidence (% infected leaves) and severity (number of lesions/leaf) of OLS in olive growing regions in Palestine, including the regions of Hebron, Bethlehem, Tulkarm, Salfit, Jenin, Nablus, Ramallah and Qalqiyah. OLS was found in all study areas with significantly higher percent incidences in Jenin and Nablus (67.16% ± 18.16% and 46.06% ± 23.70%, respectively). OLS was more severe in Nablus, Qalqilyah, Jenin and Tulkarm (severity grade 3.0 - 3.7). Analysis indicate that there is a positive correlation (R2 = 0.597) between disease incidence and severity. OLS appeared to be particularly severe on trees that were growing in regions with higher annual rainfall. The correlation between severity and rainfall was positive (R2 = 0.543).

油橄榄两种叶斑病研究进展

孔雀斑病和灰斑叶霉病是世界油橄榄栽培区普遍发生的两种叶部病害,严重发生时,致使叶片大量脱落,产量降低。因为这两种病害发生条件相似,为了鉴别和研究这两种病害,在查阅、整理国内外两种叶斑病相关文献资料的基础上,从两种叶斑病的症状、病原,发病规律和防治等方面综述了最新研究成果,并探讨了目前研究中的不足和以后可能的研究方向。