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Adding some fertilizer to the soil will make those nutrients available and can combat deficiencies. Fertilizers will include most or all of the macro and micro-nutrients the plants need to thrive. There are several easy ways to remedy the nutrient deficiencies in soils.

Use chemical control: Regular doses of a fungicide, especially in the spring, can stop an outbreak before it begins.

Follow spacing guidelines when planting and avoid natural windbreaks for good air circulation.

Grow plants in an open, sunny locations so the foliage dries quickly.

Adding a layer of mulch to the soil will also reduce splashing. Control these factors by only watering infected plants when the top few inches of soil are dry, and by watering at soil level to reduce splashback.

Water carefully: Fungal diseases spread when plants stay in moist conditions and when water droplets splash contaminated soil on plant leaves.

Rake and discard fallen leaves in the fall.

Remove infected plant debris: Fungi can overwinter in contaminated plant debris, so remove all fallen leaves from infected plants as soon as possible.

Purchase resistant varieties: Invest in fungus-resistant plant varieties to reduce the chances for black spot diseases.Here are a few tips to prevent black spot outbreaks. Nutrients offered via foliar application are often taken up even quicker than those put in the soil, so the foliar application can be great for swiftly addressing specific deficiencies. In addition to supplementing the soil with nutrients, foliar fertilizer can be applied directly to the plant's leaves. Though not as finely tuned as artificial fertilizer, compost can nevertheless be rich in important nutrients and should be applied to the soil regularly. Organic fertilizers such as animal manures and bonemeal can supply plants with all the nutrients that they need to grow strong and healthy. Regularly apply organic fertilizer pellets.

Solutions: There are several easy ways to remedy the nutrient deficiencies in soils. The best solution is to remove the infected plants and dispose of the plant material off-site. If the plant is infected with a bacterial or fungal pathogen, there is no course of treatment that cures the diseased plants. Keep it off the leaves and make sure granular products are watered into the soil well. In the event of nutritional deficiencies, the best solution is to use a granular or water-soluble liquid fertilizer, and apply it to the soil at about half the recommended dosage. Water container plants until excess water drains out the bottom water in-ground plants until the soil is soaked but there isn’t standing water on the surface. For lack of water, immediately water the plant using room temperature rainwater, bottled spring water, or filtered tap water. Once hormones within the plant begin the process of senescence, it’s irreversible. Solutions: If flower withering is a natural progression due to age, there is nothing that can be done to slow or stop the process.