What’s Wrong With My Plant? (Manganese Deficiency, Black Spot, Orange Spot)

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Common questions and plant symptoms that I receive from clients, bloggers and everyday callers.

Manganese Deficiency

Sega Plant

A blogger wrote the following concerning their Sago Palm : “Help! What’s happening to my Sago Palm – it’s turning yellowish-brown straw-like. Not happening to others; only this one.”
Well, judging by the state of this plant I would conclude that it is suffering from manganese deficiency. It would be wise to first conduct a soil pH and nutrient testing. If your soil pH is below 5.5,  it is most likely leeching all of the manganese and thus preventing the nutrient to reach the rest of the plant. A well balanced soil pH level allows nutrients to flow throughout the entire plant.
Once you have conducted a soil pH and nutrient testing, go to your local gardening store and purchase manganese sulfate. Follow the application instructions based upon your pH balance and the size of your plant. The damaged leaves will not heal, however newly grown leaves will be healthy.

Black Spot

This rose bush is suffering from a common fungal disease called Black Spot. Black Spot disease spreads throughout the leaves and stems. Eventually, all of the leaves will fall off leaving the bush bare and unprepared to thrive during the winter season. If you own a rose bush, I would advise you to avoid watering it’s foliage and to place the plant in a sunny area. This will prevent the bush from holding moisture and becoming a victim to a fungus such as black spot.
To treat black spot on your rose bush, remove all of the infected leaves and stems. Be sure to remove and destroy the fallen foliage as well. The next step would be to treat your bush with fungicide, be sure to spray both the leaves and the lems. If you prefer an organic fungicide, try neem oil.

Orange Rust

Rust Plant

If you notice this yellowish-orange substance on the back of your plant, it is a fungal disease called Orange Rust. Orange Rust spreads in moist air and it attaches to plants that grow in hot, dry and nutrient-deficient soils.
Be sure to remove and destroy all of the rust infected leaves, even those that may have fallen to the ground.  Avoid overhead watering and spray with sulfur once a week. It is also recommended that you use Neem oil products. It is advised that you  apply the neem oil once every seven days until plant shows signs of healing.