Pinyonia
Gagné, 1970
Pinyon Spindle Gall Midge
Pinyonia is a of in the . The genus contains at least one described , P. edulicola, which forms spindle-shaped on pinyon pine needles. These are small that induce abnormal growth through larval feeding activity.
Pronunciation
How to pronounce Pinyonia: //pɪˈjoʊniə//
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Identification
are tiny , approximately 1 mm in length, typical of . The is distinguished by its specific : spindle-shaped swellings on pinyon pine needles. Galls contain 5–40 and cause affected needles to and drop prematurely.
Habitat
Associated with pinyon pine (Pinus edulis) in urban and natural settings. Found in Colorado, particularly in residential areas and forests where trees occur.
Distribution
Colorado, USA. Records from Fort Collins and Colorado Springs.
Seasonality
emerge mid-June to mid-July. pupate in late spring following year of formation.
Diet
feed within on pinyon pine needle tissue. Specific feeding mechanism involves inducing tissue growth that surrounds and nourishes developing larvae.
Host Associations
- Pinus edulis - Pinyon pine; sole known . Females lay in developing needles mid-summer. form at needle base.
Life Cycle
Females lay in developing pinyon pine needles mid-summer. hatch and crawl to needle base, where feeding induces formation. Five to forty larvae occupy each gall, feeding and growing within. occurs in late spring of following year. emerge mid-June to mid-July. Infested needles drop 5–7 years prematurely.
Ecological Role
formation causes premature needle drop, potentially leading to substantial and tree weakening. Heavy may increase vulnerability to such as Pinyon Pine (Ips confusus). Serves as for Platygaster sp. (: Platygasteridae), with observed rate approximately 1.7%.
Human Relevance
Considered a pest of ornamental and landscape pinyon pines in urban Colorado. Heavy cause aesthetic damage and tree stress. Chemical control trials have been conducted; effectiveness depends on proper timing, rate, and application method. Carbofuran, dimethoate, and oxydemeton-methyl showed significant reduction in infestation levels in 1982 trials.
Similar Taxa
- Matsucoccus acalyptus (Pinyon Needle Scale)Also occurs on pinyon pine in same region and season, but is a (: Matsucoccidae) rather than . Produces 'bean stage' waxy coverings on needles rather than spindle . Males are winged and appear early spring; females are .