About San Jose Scale
A tiny armored scale insect that forms gray encrustations on the bark and fruit of apple, pear, and stone fruit trees. It was one of the first pests to prompt quarantine legislation.
Did You Know?
Its discovery in San Jose, California in 1880 led to the first plant quarantine law in the United States.
How to Identify San Jose Scale
San Jose Scale (Diaspidiotus perniciosus) belongs to the order Hemiptera, family Diaspididae. Adults typically measure 1-2 mm diameter.
San Jose Scale Habitat
San Jose Scale is found in orchards habitats, particularly across Worldwide temperate regions. This species has adapted to thrive in its preferred environment, where it can find suitable food sources and shelter.
San Jose Scale Diet and Feeding
San Jose Scale feeds on fruits. Fruit-feeding insects are attracted to ripe and decaying fruit, and some species can be significant agricultural pests.
Where Is San Jose Scale Found?
San Jose Scale can be found in Worldwide temperate regions, where it inhabits orchards environments. Its distribution is influenced by climate, food availability, and habitat suitability.
Distribution Map
Where San Jose Scale can be found
Is San Jose Scale Dangerous?
San Jose Scale is generally harmless to humans. It does not bite or sting and poses no significant health risk. Like most insects, it prefers to avoid human contact and will typically flee rather than confront a perceived threat.
San Jose Scale Role in Nature
San Jose Scale is part of the food web as a primary consumer, feeding on plant material. It serves as an important food source for birds, bats, amphibians, and other insectivores, connecting plant energy to higher trophic levels.
Seasonal Activity
Frequently Asked Questions About San Jose Scale
What does San Jose Scale look like?
The San Jose Scale typically measures 1-2 mm diameter.
Where is San Jose Scale found?
The San Jose Scale is found in Worldwide temperate regions and typically inhabits orchards environments.
What does San Jose Scale eat?
The San Jose Scale feeds on fruits.
Is San Jose Scale dangerous to humans?
The San Jose Scale is generally harmless to humans. It does not bite or sting and poses no significant health risk.
Is San Jose Scale endangered?
The San Jose Scale is currently classified as Not Evaluated by conservation assessments. Habitat loss and environmental changes are among the primary threats to its population.
What is an interesting fact about San Jose Scale?
Its discovery in San Jose, California in 1880 led to the first plant quarantine law in the United States.
Cite This Page
APA:
InsectDiscover. (2026). San Jose Scale (Diaspidiotus perniciosus). Retrieved from https://insectdiscover.com/insect/san-jose-scale
MLA:
"San Jose Scale." InsectDiscover, https://insectdiscover.com/insect/san-jose-scale.