Glassy Winged Sharpshooter
I had several of these brought into my office several days ago. They are partly responsible for the demise of Oleanders all across Southern California. Their feeding activity centers around the water conducting tissue in the plant they are attacking. The orange bulb shaped area that you see on the bottom of the leafhopper in the picture is its 'head pump', a muscular organ that helps the insect pump the watery xylem fluid (mostly water coming from the roots) from the plant and through its body.
|Glassy Winged Sharpshooter|
Should you control these pests? Generally, no. However if the squirting gets to be too much you might try a pyrethrum based organic control like Pyganic, however be very selective as far as what and where you spray because this insecticide, like many pyrethrum based products, will eliminate beneficial and predatory insects as well as the pest.