And diseases. Leafhoppers are a vector for a number of plant diseases.
http://www.bulletinofinsectology.org/pdfarticles/vol60-2007-175-176wilson.pdf
Leafhoppers and planthoppers (Hemiptera = Rhyn-chota: Auchenorrhyncha) are among the most abun-dant groups of insects. Around 20,000 leafhopper (Ci-cadellidae) species have been described but estimates suggest 100,000 species may exist (Dietrich, 2005). In addition there may be around 10,000 planthopper spe-cies of which the most significant pest species occur within the family Delphacidae. Around 200 vectors of phytoplasma are already known but many more are likely to be recognized because there are many more phytoplasma diseases characterised than there are known vectors of the diseases. Most the disease vec-tors will be found among leafhoppers and delphacid planthoppers.
Cicadellidae
Leafhoppers (family Cicadellidae) transmit over 80 known types of plant disease, including ones caused by viruses, mycoplasma-like organisms (MLOs), and spiroplasmas. Examples include aster yellows, beet curly top, blueberry stunt, dwarf disease of rice, phony peach, and Pierce’s disease of grapes.
LINKS
X-Disease of Peach Aster Yellows Pierce's Disease Pierce's Disease and its Vectors Beet Leafhopper Leafhoppers Carrot - Aster Yellows
Fulgoroidea
Planthoppers (superfamily Fulgoroidea) have been implicated as vectors in the transmission of about 20 plant diseases (viruses and MLOs) including cereal tillering disease, maize mosaic, Northern cereal mosaic, oat sterile dwarf, rice hoja blanca, rice stripe, and sugarcane Fiji disease.
LINKS
Planthopper Planthopper Management of Rice Insect Pests