Question
QUESTION: I live in Central Florida and keep my desert rose plants outside.
They are suddenly being attacked by some sort of caterpillar that is small, thin, orange with little black spikes. They are eating and destroying my desert roses.  What can I use to get rid of them?

ANSWER: Dear Judy, An interesting fun fact is that the orange and black butterflies/caterpillars are known to be poisonous and for that reason, the birds will avoid them.  It is no wonder that the caterpillar is poisonous if it is eating desert rose, which is extremely toxic.  Now, what to do about getting rid of the caterpillars.  There are two great organic methods to getting rid of these caterpillars - Bacillus thuriengensis and Spinosad.  Both will kill the caterpillars, and Bacillus has been recommended for years as a remedy for caterpillars, but I prefer the Spinosad because it is known for a much quicker kill.  You spray the plant with the spinosad and after the caterpillar takes a few bites, it dies.  You could also hand pick them, but of course you would need some heavy plastic gloves that you throw out later (Playtex), you would have to be very careful with the caterpillar spines and getting any plant sap on you, so I would definitely opt for the Spinosad.  You should find it easily available in any garden center.  I think Green Light makes a good one, but there are many others.  I hope this information helps, but write back if you have more questions.  Good luck, Melissa


---------- FOLLOW-UP ----------

QUESTION: Dear Melissa:
Thank you so much for your assistance.  I had to purchase the Bacillus thuriengensis as I was unable to find the Spinosad, but the caterpillars are gone and already my plants are looking better and getting new little leaves.  The least damaged plant is starting to flower.  

My question is do I need to re-apply this product or is one time sufficient?

Answer
Dear Judy, You will need to spray the Bacillus again if you see any new caterpillars showing up, as the organics don't leave long lasting residues.  Desert rose are pretty tough if you keep them dry and happy, so an occasional leaf loss won't do too much.  The Spinosad product I use is Green Light Lawn and Garden Spray with Spinosad in case you can find it and need something that works for a quick kill on other insects.  Good luck to your desert rose.  Melissa