How Do I Get Rid Of Caterpillars On My Ferns? Treatment. Pesticides containing the insecticidal proteins of Bacillus thuringiensis serve as caterpillar repellents that are safe to use on ferns, though they may leave a harmless white residue on your plant’s foliage. Apply these pesticides to your ferns when you purchase them and in the
What Is Eating The Leaves On My Ferns? The University of Rhode Island Landscape Horticulture Program recommends spraying infected ferns with warm water to dislodge the insects. Place potted ferns outdoors during mild weather, or in the bathtub in winter, and spray off all visible insects. Spray ferns with warm water whenever new signs of
How Do You Get Rid Of Black Worms On Ferns? Bacillus thuringiensis, a natural, soilborne bacteria, is among the most effective treatments for these caterpillars. To use a Bt spray, dilute the concentrate in water, usually at a rate of 4 teaspoons of the produce in 1 gallon of water. Check the label because rates