Rhyacionia zozana

(Kearfott, 1907)

Ponderosa Pine Tip Moth

Rhyacionia zozana is a tortricid commonly known as the ponderosa pine tip moth. The is a herbivore of ponderosa pine, with larvae feeding on terminal shoots. It serves as to a diverse of , with documented rates averaging 47% in California and Oregon . Males locate females using cues, a that has been successfully disrupted using aerially applied synthetic pheromone for population management.

Pronunciation

How to pronounce Rhyacionia zozana: //ˌraɪʲæˈkoʊniə zoʊˈzeɪnə//

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

Habitat

Ponderosa pine forests; specifically plantations and natural stands of Pinus ponderosa in California and Oregon.

Distribution

California and Oregon, United States.

Seasonality

occurs earlier than previously reported in warmer climates; specific timing varies with temperature conditions.

Diet

Larvae feed on ponderosa pine (Pinus ponderosa) terminal shoots and tips.

Host Associations

Pinus ponderosa - plantlarvae feed on terminal shoots
Glypta zozanae - ichneumonid ; most abundant , attacking over 30% of collected
Phyllobaenus binotatus - Cleridae ; found in association with cocoons
Leptothorax sp. - Formicidae ; found in association with cocoons
Aegilips sp. - potential Figitidae; single specimen recovered from cocoon, relationship undetermined

Life Cycle

Larvae and pupae occur within plant tissues; cocoons are formed. Specific developmental stages and timing beyond larval/pupal are not documented in available sources.

Behavior

Males use -mediated orientation to locate females for mating. This can be disrupted by synthetic pheromone applications, which reduced orientation for 35–75 days in field trials.

Ecological Role

Herbivore that damages ponderosa pine terminal shoots; serves as for diverse with high natural rates.

Human Relevance

Considered a forest pest of ponderosa pine. -based has been tested as a management tactic, with aerial applications reducing levels. The synthetic pheromone is behaviorally active for multiple Rhyacionia , suggesting potential for broader application.

Similar Taxa

Eucosma sonomanaCo-occurs in ponderosa pine and was studied alongside R. zozana in disruption trials; both are tortricid shoot borers with similar management concerns.

More Details

Parasitoid community

Sixteen hymenopteran and one dipteran have been documented from R. zozana larvae and pupae. Total averaged 47.2% in quantitative studies, indicating substantial top-down .

Pheromone disruption efficacy

Higher application rates of microencapsulated (59.3 g AI/ha) prolonged disruption duration (75 days vs. 35 days) but did not provide greater proportional reduction in compared to lower rates (29.6 g AI/ha), suggesting diminishing returns for increased dosage.