mildew on courgette leaf. Mildew in courgettes shortens the growing season. Started by yorkiegal on Grow Your Own. No fungicide will cure powdery mildew once it has become well established. The white coating greatly diminishes the appearance of the plant, but it is not fatal unless left uncontrolled. as007 Posts: 94. Powdery mildew is easy to identify as a white powder which first appears in spring on young emerging leaves. Good luck!" Barbara Pleasant on Monday 7 July 2014 Hi All 3 of my courgette plants are covered in white powdery mildew. August 2014 in Fruit & veg. The white powdery coating on a curcubit’s leaves is made up of spreading fungal spores. It looks almost like a fine coating of talcum powder. This affects the plant’s performance, with growth, flowering and fruiting all being adversely affected. In extreme cases, the mildew can lead to dieback and even kill a plant. 15 Replies 4720 Views July 01, 2012, 14:37 by Springlands white spots on courgette leaves Started by needssomehelp on Grow Your Own. My courgette leaves are white. Please can anyone tell me why this has happened and how I can prevent it in future? If left untreated it will affect more and more leaves, sometimes fruit and even small twiggy growth. The powdery mildew will spread to other areas of the plant--as well as other plants in the area- … However, as it spreads, it stresses and weakens the plant and makes it hard for photosynthesis to occur. The powdery mildew usually presents itself on the leaves first as small, round white fuzzy spots. Infected courgette plants are covered in a greyish-white mould, mainly on the upper surface of the leaves and young shoots. ... Courgette leaves covered in mold / white powdery mildew. 9 Replies 4790 Views June 15, 2010, 18:54 by jamima white mould on courgette leaves https://www.wikihow.com/Get-Rid-of-Powdery-Mildew-on-Plants Powdery mildew is a fungal disease that results in a powdery gray or white coating on the leaves and stems of infected plants. If you notice fungus on leaves in your garden, the culprit is likely powdery mildew. Powdery mildew is a common disease that affects many plants including zucchini. "If you are just beginning to see white patches on a few leaves, a milk spray can slow the spread of the fungi to new leaves.