Taxodiomyia cupressiananassa

(Osten Sacken, 1878)

cypress twig gall midge

A in the that induces distinctive twig on cypress trees. The spongy galls are initially snow-, turning with age, and eventually drop from the tree with leaf fall. pupate within the galls, with emerging later in the season or following spring. The is considered a pest of ornamental and cypress plantings.

Taxodiomyia cupressiananassa by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Taxodiomyia cupressiananassa by Eric Hunt. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Taxodiomyia cupressiananassa: /tæksiˌoʊdioʊˈmaɪə kjuˌprɛsiænəˈnæsə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

appear as globular, spongy growths on cypress twigs, often mistaken for cones. Fresh galls are snow- and soft, becoming rusty- and firmer with age. Galls bear numerous small projections, giving them a spiky appearance. The galls are larger and more irregular than true cypress cones. are tiny typical of , with reduced and long, bead-like .

Images

Habitat

Associated with cypress trees in wetland and riparian settings, including swamps, pond margins, and floodplain forests. The has been observed on planted bald cypress trees north of their range.

Distribution

to southeastern United States; recorded from Missouri, Illinois, and Florida. The occurs wherever its cypress trees are present, including areas where bald cypress has been planted outside its natural range.

Seasonality

are visible on trees from mid-growing season through fall. may emerge from galls still on the tree later in the season. typically overwinter in fallen galls, with and adult occurring the following spring.

Host Associations

Taxodium distichum - primary bald cypress
Taxodium ascendens - primary pond cypress

Life Cycle

are laid on cypress twigs. induce formation and develop inside the spongy gall tissue. occurs within the gall. Galls drop from the tree with leaf fall in autumn. Larvae overwinter in fallen galls, completing development and emerging as the following spring. Some adults may emerge from galls remaining on the tree later in the same season.

Behavior

manipulate growth through chemical secretions, inducing the formation of specialized structures that provide shelter and nutrition. The galls are initially soft and , hardening and darkening as they age.

Ecological Role

Acts as a -forming on cypress trees. The galls represent a significant sink for resources and may affect twig growth. The serves as a food source for and other within the gall .

Human Relevance

Considered a pest of ornamental bald cypress and pond cypress in urban plantings and managed landscapes. formation can reduce aesthetic value of trees and potentially impact growth, though is generally minor. Management options are limited and rarely warranted.

Similar Taxa

Gymnosporangium juniperi-virginianaeProduces similarly colored, spiky on Juniperus virginiana (eastern red-cedar), which is in the same Cupressaceae. The rust galls differ in being smaller, harder, and producing gelatinous telial horns in wet conditions, whereas T. cupressiananassa galls are larger, spongy, and lack such structures.