Indoor grapefruit trees may be all foliage and no fruit.
Sticky "honeydew" is generated by insects that suck juices from plants through narrow snouts. They come inside to afflict citrus houseplants like grapefruit on plants that spend summers out-of-doors, in soil or simply through open doors and windows.
Roundish red or yellowish female scales are the size of a nail head and attack twigs, leaves and branches. Male scales only live a few hours to mate. Oil sprays are frequently recommended for scale control.
About this Author
Laura Reynolds began writing professionally in 1974. She has worked as a nonfiction author and editor, and as a newspaper editor. Reynolds has been appointed and elected to local offices as well. She has a Bachelor of Science in education from Northern Illinois University.