You can find good details for lipid extraction from leaves of plants in reference No.1, in addition to other references which could be useful for answering your question. Good luck
1. Metabolic studies of powdery mildew infection of cucumber and its possible control by lithium chloride, JK Abood
2. Chapter: Lipids in Fungal Biotechnology, M. Sancholle · D. M. Lösel · E. Laruelle
2. Article: Role of Membrane Lipids in Powdery Mildew Infection of Cucumber, Dorothy M. Lösel · Emily T. Meilleur · Jawad K. Abood
3. Article: Synthesis and functioning of membrane lipids in fungi and infected plants, Dorothy M. Lösel
4. Article: Lipids in the Structure and Function of Fungal Membranes, D.M. Lösel
5. Chapter: Effects of Water Stress on the Lipid Metabolism of Durum Wheat, A. Kameli · Dorothy M. Lösel
6. Chapter: Effects of Powdery Mildew Infection on the Lipid Metabolism of Cucumber, J. K. Abood · Dorothy M. Lösel