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How to identify it
- Adults are very small leafhoppers with working wings. Where a bed is infested, they are easy to catch in a sweep net all through July.[1]
- Newly hatched nymphs are whitish and about 1/20 inch long. Middle-stage nymphs are pale or dark yellow, and the last stages are darker, greenish-gray or yellow. Nymphs have only wing buds and cannot fly.[1]
- Several other leafhopper species turn up in cranberry sweeps, so take care to identify specimens correctly. Nymphs are hard to pick out by eye, and UMass staff have only found them by examining sweep contents under a microscope.[1]
Look-alikes
| Look-alike | How to tell them apart |
|---|---|
| Other leafhoppers in cranberry sweeps | Several leafhopper species are caught in cranberry sweeps along with the blunt-nosed leafhopper, so specimens need careful identification.[1] |
Where it lives
It lives on cranberry beds and related wild shrubs. Large populations are common on New Jersey beds, it has been found on Maine and Wisconsin beds for a number of years, and in Massachusetts it has turned up on low-input, organic, abandoned and wild bogs.[1]
Biology and life cycle
There is one generation a year. In late summer, females insert eggs lengthwise under the bark of cranberry stems, and the eggs spend the winter there.[1]
Eggs begin hatching in early spring; in Massachusetts in 2023 the first nymphs appeared in the second week of May. Nymphs pass through five stages over about a month, and winged adults are present in July.[1]
Away from cultivated bogs it is abundant on leatherleaf, dwarf huckleberry and fetterbush and less so on sheep laurel, while in New Jersey it appears to prefer cranberry near bogs.[1]
All feeding stages push a tubular, jointed beak into stems, leaves or buds and suck plant juices.[1]
Phytoplasma infection changes how the insect develops. In laboratory tests, nymphs on infected cranberry plants took longer to become adults and grew into larger adults, while females laid more eggs on healthy plants than on infected ones.[3]
Damage and signs
- Direct feeding injury to cranberry vines has not been observed. The problem is false blossom: a leafhopper that feeds on an infected plant picks up the phytoplasma and passes it to healthy vines when it feeds again.[1]
- False blossom distorts flowers, reduces fruit set and can cause significant yield losses. The disease spreads through the whole plant and cannot be cured, and after control efforts in the early 1900s it has recently reemerged. USDA researchers have developed new tests that detect the phytoplasma in plant extracts and in the leafhopper.[2]
- Diseased flowers stand upright instead of hanging down, the petals look more like a daisy's, and the flowers are often deeper pink or red than normal. Diseased uprights do not produce berries.[1]
Health risk
The sources treat it only as a cranberry pest and disease vector; none mentions bites or any risk to people or pets.[1][2]
Control
Prevention
There is no treatment for false blossom once vines are infected. Leafhoppers can move in from nearby abandoned or low-input beds, so beds next to them, and new hybrid plantings, need careful monitoring.[1]
Traps and physical control
Sweep before bloom, from mid-May into June, to find nymphs. They are tiny and easily lost among springtails, so bag the net contents and examine them under a microscope.[1]
Pesticides
Reports from New Jersey list acetamiprid, diazinon and carbaryl as effective insecticides. UMass has not seen outbreaks on Massachusetts beds that follow a spring broad-spectrum insecticide program.[1]
Commercial plant defense elicitors tested in a greenhouse study did not make cranberry plants more resistant to the leafhopper or reduce false blossom infection.[4]
Common questions
- Does the blunt-nosed leafhopper damage cranberries directly?
- No direct feeding injury to the vines has been observed. The harm comes from false blossom, the phytoplasma disease it spreads from infected to healthy vines.[1]
- How do I recognize false blossom?
- Infected flowers stand erect, with petals that look more daisy-like than healthy down-facing flowers, and they are often deeper pink or red. Diseased uprights produce no berries, and there is no cure.[1]
- When should I look for blunt-nosed leafhoppers?
- Sweep for nymphs before bloom, from mid-May into June, and expect adults in sweeps through July.[1]
Sources
- UMass Amherst Cranberry Station (Center for Agriculture, Food, and the Environment), “Blunt-nosed Leafhopper in MA Cranberry (2023).” www.umass.edu/agriculture-food-environment/cranberry/fact-sheets/blunt-nosed-leafhopper-in-ma-cranberry-2023 (accessed 2026-11-09)
- American Phytopathological Society (Plant Disease); USDA Agricultural Research Service authors, “Advances in Detection and Relative Quantification of the Cranberry False Blossom Disease-Associated Phytoplasma (Polashock and Wei 2026, Plant Disease 110:1539-1542).” doi.org/10.1094/PDIS-08-25-1779-SC (accessed 2026-11-09)
- Springer (Journal of Chemical Ecology), “Phytoplasma Infection of Cranberry Affects Development and Oviposition, but Not Host-Plant Selection, of the Insect Vector Limotettix vaccinii (Pradit et al. 2020, Journal of Chemical Ecology 46:722-734).” doi.org/10.1007/s10886-019-01137-6 (accessed 2026-11-09)
- Frontiers (Frontiers in Plant Science), “Application of Plant Defense Elicitors Fails to Enhance Herbivore Resistance or Mitigate Phytoplasma Infection in Cranberries (Rodriguez-Saona et al. 2021, Frontiers in Plant Science 12:700242).” doi.org/10.3389/fpls.2021.700242 (accessed 2026-11-09)
- iNaturalist, “Limotettix vaccinii taxon page (order and family).” www.inaturalist.org/taxa/223807 (accessed 2026-11-09)