Systemic and foliar insecticides can be used to prevent aphid feeding. Foliar fertilizers are applied directly to leaves. Foliar sprays are used on fruit crop trees in soils of high alkalinity. Potassium can be added as potassium sulfate through foliar spray. Symptoms of juglone poisoning include foliar yellowing and wilting. The diseases can be divided into foliar, fruit, stem and soil-borne diseases. Foliar spray of urea can be a quick method. However, attempts to fix this with foliar nutrients and compost tea have not proven effective. It is a long white-skinned cultivar with both foliar and tuber resistance to late blight. It also works of foliar contact causing rapid desiccation. Young fruit, often infected by foliar conidia, can also display similar symptoms to infected leaves. Red blotch presents with both foliar and fruit symptoms. "C. libani" is susceptible to a number of soil-borne, foliar, and stem pathogens. When soap water is applied as a foliar spray, sunlight evaporates the water. Apply to the plant as a foliar spray.