Zinnias die mainly due to Alternaria leaf spot disease and bacterial leaf spot disease. Powdery mildew also can kill your Zinnias. Zinnias are grown for their beautiful blossoms that come in different colors. They are grown with passion in the United States. It is easy to grow Zinnias in the garden. Sometimes the plants do run into some issues. Zinnia leaves turn brown and crispy when the plant is affected by leaf spot diseases. Leaf spots are caused by a variety of fungal pathogens. Alternaria leaf spot disease also affects Tomatoes, Sunflowers, and Lettuce.
So, it can spread from such plants to your Zinnias. Reddish-brown spots appear on the surface of the leaves. These reddish-brown spots expand and the centers turn greyish white. Make sure your Zinnias are planted at a good distance from each other. Proper air circulation can prevent such fungal infections. Bacterial leaf spots start as dull gray spots.
They appear like water-soaked blotches. Eventually the foliage is filled with yellow spots. You may have a zinnia that is working on Southern hemisphere seasons, or because of your great care, the Zinnias rushed through their life cycle faster than usual. Collect the seeds form the deadheads and plant them next spring. Next year don't spoil your plants so much and they will bloom for longer. Why are my zinnias dying? I planted these in mid april and they were already in bloom.
I also live in Tennessee Report It Reply:This may not be the reason but most plants are killed by poor drainage and over watering, Reply:you have to give us some hints for your question.. Reply:I just planted 2 zinnia's in the front of my house with full sun in south Florida. I water them daily or Mother Nature does and they are doing well. The soil is straight potting soil and not real deep, under it is pea rock and plastic to keep the weeds down. It all depends on where you have them sun wise and watering.
It is great for even roses. Jode' Reply:maybe to much sun, my dear did you know plants get sun burn also? Reply:Zinnias like it kind of dry so you might have over watered them. You can get spray for mildew at most garden centers. If this is the problem then it might be a good idea to only water at the base of the plant in the morning and avoid getting the leaves wet or watering in the evening.
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Flower combo for wedding? If aphids are on plant tips, simply pinch them off and discard them in the trash. If they have infested a lot of the foliage, spray them with commercial insecticidal soap according to label instructions.
Be sure the soap spray contacts the aphids directly. Click here for more information on Dealing with Aphids. Related to spiders, they have four pairs of legs, piercing-sucking mouthparts and very compact bodies. They may be yellow, green, red or brown. They suck juices from the leaf tissues, draining their chlorophyll and injecting them with toxins.
Usually their damage is most visible on the upper leaf surfaces of the lowest leaves on the zinnia stem. They are stippled with small yellow dots or red spots. Leaves and adjacent stems are often distorted or swathed in fine webbing. Spray affected leaves in the late afternoon with insecticidal soap according to label instructions. Pull out and throw away any zinnias that are fully infested so that the mites do not spread to other plants.
Take care not to transfer them to other plants on your hands or on tools. Click here for more information on Dealing with Mites. They have distinctive shiny metallic green and copper-brown wing covers.
As larvae grubs they are inch long, plump, grayish-white worms with brown heads which lie curled just below the surface of the soil over the winter.
They emerge in mid summer as voraciously hungry beetles and cluster on plant foliage. In no time they can skeletonize a leaf so that only its veins remain. Begin to handpick any beetles as soon as you spot them. Drop them into a jar of soapy water. For long term control of chronic Japanese beetle problems, spray your lawn where they lay their eggs with a predatory nematode product as directed.
These microscopic roundworms are packaged as a powder to be mixed with water.
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