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First Generation Leafhopper Adults Now Present

First generation adult leafhoppers known to transmit X-disease are now present in Washington orchards. Consider monitoring. C. m. reductus adults were collected at most survey sites last week, including those in Yakima, Mattawa, and Peshastin.

Seven leafhoppers are known to transmit X-disease phytoplasma: Colladonus montanus reductus, Colladonus geminatus. Colladonus montanus, Fiebriella florii, Scaphytopius acutus, Paraphlepsius irroratus, Euscelidius variegatus and the two most commonly caught carrying phytoplasma in Washington are C. reductus and C. geminatus.

Use yellow sticky cards or sweep nets to monitor your leafhopper population. Place traps on orchard borders two or three trees from the edge, in areas of concern in your block and throughout block. Approximately one (1) trap per two acres. Monitor weekly. Use presence (an average of one leafhopper per trap) as a threshold to spray. Identify leafhoppers that vector X-disease phytoplasma. See the vector gallery for images. To download the app with insect vector images search for ‘Little Cherry Scouting Guide’ in your App Store. For an Apple version click here or for Android version click here.

above and side view of leafhopper


Additional information

X-disease webpage

Little Cherry Virus webpage

Symptoms Gallery

X-disease Vector Gallery

Nursery Prevention of X-disease Phytoplasma and Little Cherry Virus Recommendations

BMPs for tree removal for X-disease and Little Cherry Virus infected trees

Case studies on tree removal for X-disease phytoplasma and Little cherry virus

Alternative weedy hosts for X-disease phytoplasma.


Symptoms of Little Cherry Virus and X-disease Phytoplasma.

Síntomas de Fitoplasma X y Little Cherry Virus.

Symptoms of X-disease Phytoplasma in Stone Fruit.

Síntomas de Fitoplasma X en Frutas de Hueso.


Corina Serban professional photo
Corina Serban
WSU Extension
(509) 574-1595
Tianna DuPont
Tianna DuPont
WSU Extension
(509) 293-8758
Bernardita Sallato professional photo
Bernardita Sallato
WSU Extension
(509) 439-8542
Scott Harper professional photo
Scott Harper
Department of Plant Pathology, Washington State University
(509) 786-9230
tobin northfield professional photo
Tobin Northfield
WSU Entomology
(509) 293-8789



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YOU ARE REQUIRED BY LAW TO FOLLOW THE LABEL. It is a legal document. Always read the label before using any pesticide. You, the grower, are responsible for safe pesticide use. Trade (brand) names are provided for your reference only. No discrimination is intended, and other pesticides with the same active ingredient may be suitable. No endorsement is implied.

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