How Do You Get Rid Of Black Worms On Ferns?
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