Spots turn brown and angular and may have a yellow halo.
39+ Black Spots On Zinnia Leaves. Stem and root rot diseases cause black, mushy growth, and often kill zinnias. They can reside on foliage for several months before initiating disease.
Zinnias How To Plant Grow And Care For Zinnia Flowers The Old Farmer S Almanac from www.almanac.com
Often, people mistake black spots on the leaves for fungal infections. One of the most common culprits while growing basil is downy mildew. If the disease continues, i'll consider a treatment such as a fungicide.
The brown spots are usually caused by one of three types of leaf.
Elegans, deadheading and staking are unnecessary. It usually occurs on the upper sides of leaves, but can also develop on the undersides. Flowers can be large or small, single or double, and come in just about any color but blue. For now i'll keep an eye out for other plants that start showing black spots.
