|My rosemary plants have soapy white stuff on some of the branches that are very small and can be washed off with the hose. What is this soapy stuff caused by?
|Answer from NGA
August 8, 2009
|The foamy masses sound to me like spittle bugs. These tiny little pests produce a frothy substance to protect themselves from the sunshine and from predators. In large numbers they can damage the plant but you can easily discourage them by hosing them off with a strong stream of water from the hose. Or you can squish them between your thumb and forefinger. I just hose them off!
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