Are there any tiny, circular, pale brown spots on the bracts and petals?
Do the leaves have pale areas on upper surfaces and "downy" patches underneath?
Are the leaves covered with white powder?
Are the leaves yellow, curled, and wilted?
Do the leaves have tunnels or blotches in them?
Petal blight is a fungal disease known to cause problems for globe artichokes. Cold, wet weather encourages the rapid spread of petal blight through the garden. Otherwise, it tends to be localized. Remove and destroy infected flowers and branch tips. Rake debris from around the base of the plant and replace it with fresh mulch. Because the spores of petal blight overwinter on various weeds, the best precaution is to ensure that your garden is weed-free.
Pale areas on upper surfaces of the leaves and "downy" patches underneath are caused by Downy mildew. This fungus spreads quickly during cool, wet nights and warm, humid days. Leaves will wilt and die. Remove and destroy all affected plant parts and encourage good air circulation around plants by thining them. Water plants early in the morning to make sure they dry before nightfall.
White, powdery patches on the leaves are caused by a fungal disease Powdery mildew. Powdery mildew usually appears in damp places. Encourage good air circulation around the affected plants by thining them and any surrounding plants. Water plants from below to keep foliage dry. Any affected leaves should be cut off and removed.
Yellow, curled and wilted leaves usually indicate aphids. These tiny insects vary in color, green, pink, black, gray to completely white. You can control them by washing them off the plant with water spray. Insecticidal soap or neem oil should be used only with severe infestations.
Leafminer larvae tunnel inside leaves. Destroy infected leaves and caterpillars. Cultivate the garden to destroy larvae and keep adult flies from laying eggs. Cover crops with floating row cover to exclude flies.
Large, ragged holes in the leaves are caused by slugs and snails. Slugs and snails feed on the plant leaves usually at night. To control slugs and snails use diatomaceous earth around your plants. You can also handpick them during the night or use shallow dishes filled with beer as a trap.
https://www.yourgardeninginfo.com/pests-diseases-affecting-globe-artichokes
https://www.rhs.org.uk/advice/grow-your-own/vegetables/globe-artichokes
http://www7.inra.fr/hyppz/CULTURES/6c---035.htm
Ellis, B. W., Bradley, F. M., & Atthowe, H. (1996). The Organic gardener's handbook of natural insect and disease control: a complete problem-solving guide to keeping your garden & yard healthy without chemicals. Emmaus, Pa.: Rodale Press.
Sreten null
Hi! I’m Sreten Filipović. I graduated from the Faculty of Agriculture at the University of Belgrade, with a master's degree in Environmental Protection in Agricultural Systems. I’ve worked as a researcher at Finland's Natural Resources Institute (LUKE) on a project aimed at adapting south-western Finland to drought episodes. I founded a consulting agency in the field of environment and agriculture to help farmers who want to implement the principles of sustainability on their farms. I’m also a founding member of the nonprofit organization Ecogenesis from Belgrade whose main goal is non-formal education on the environment and ecology. In my spare time, I like to write blog posts about sustainability, the environment, animal farming, horticulture, and plant protection. I’ve also published several science-fiction short stories.
You can find me on LinkedIn at https://www.linkedin.com/in/sreten-filipovi%C4%87-515aa5158/
