\u00a9 2023 wikiHow, Inc. All rights reserved. Read more articles about Environmental Problems. ALL RIGHTS RESERVED. This pigment builds up when a plant becomes stressed and normal plant functions are interrupted. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Find organic, hybrid, and heirloom blends of kale seeds from around the world available at Burpee seeds. Prevention of Frogeye leaf spot includes having proper soil drainage, planting healthy seeds and transplants, and using proper weeding and crop removal techniques. Eggs shells, banana peels, grains, and mushrooms will add phosphorus to your compost pile or worm composting bin and result in a great plant fertilizer dense in this vital nutrient. Most mature leaves are a shade of green or a stunning deep purple. If this is the cause of our wilting plants, the leaves should rebound once the weather cools off. Curious if you can eat kale that has turned yellow? Bronzed cutworm (Nephelodes minians) adult, Cutworms will curl up into a characteristic C shape when disturbed, Greasy cutworm (Agrotis ipsilon aneituma) adult. The smaller leaves are often more tender. Sowing seeds Kale can be direct seeded or started indoors for transplants. Your plants will have open wounds from the feeding, which can allow diseases and other harm to infect your kale. These bugs, often referred to as calico bugs, destroy your plants by draining the nutrients, similar to aphids. A soil that has a pH level between 6-7 has maximum phosphorus availability. Frogeye leaf spot is another condition that can cause pale green, gray, or white spots, with a brown ring around the border. 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