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I have white crystally/powdery stuff growing on my plants.?
This white stuff is only growing at the base of each leaf, where it attaches to the branch. So far, it is growing on my gardenia and mandevilla, and it is killing both of them. Any ideas? I've tried several insecticide/fungicides and none of them have worked so far. The branches have turned a weird shade of brown and about half of the leaves are dead. Buds die and fall off before they have a chance to bloom. I live in southern California, so it is hard enough keeping my plants alive in the summer heat!!
Its called Powdery Mildew. Its a fungus .... You can get rid of it by mixing up some baking soda in water 4 - 5 tablesppoons in a gallon of water, thoughly dissolving it , and then spray it on the affected plants.. Its usually caused by wet conditions . When you water your plants , try not to get the foliage wet. Water in the morning, so excess water can dry up ; avoid watering late afternoon / evening .
Run a search on " Powdery Mildew " for more advise, or stop at your local garden center ....
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