Conotrachelus crataegi

Walsh, 1863

quince curculio, Hawthorn Curculio

Conotrachelus crataegi, commonly known as the quince curculio or hawthorn curculio, is a true weevil (Curculionidae) that infests hawthorn fruits (Crataegus spp.) in North America and Mexico. are attracted to fruit volatiles, and females oviposit into developing fruits where larvae bore through flesh to destroy seeds. The exhibits overlapping developmental stages with adults active primarily from April to September. It is a significant pest of commercial hawthorn (tejocote) production, causing direct damage through larval feeding and indirect losses via premature fruit abortion.

Pronunciation

How to pronounce Conotrachelus crataegi: /koʊnoʊˈtreɪkələs krəˈtiːdʒaɪ/

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

Identification

Conotrachelus crataegi can be distinguished from the closely related () by association—C. crataegi specifically attacks Crataegus spp. (hawthorns/tejocote) rather than the broader rosaceous host range (Prunus, Malus, Pyrus, Vaccinium) of C. nenuphar. of C. nenuphar have been more extensively described and show geographic variation in voltinism ( northern strain vs. multivoltine southern strain), whereas C. crataegi in Mexico show extended adult activity periods without clear geographic strain differentiation. Both share the characteristic elongated rostrum and curved body form typical of Conotrachelus, but specific morphological distinguishing features require detailed examination.

Habitat

Orchards and wild stands of hawthorn (Crataegus spp., particularly C. mexicana) in the Sierra Nevada region of Puebla, Mexico, and other states where tejocote is cultivated. The occurs in temperate fruit-growing regions where Crataegus are present.

Distribution

North America: recorded from Canada (Ontario, Québec) and the United States; Mexico: seven states where hawthorn (tejocote) is grown, with confirmed in Puebla state in the Sierra Nevada region.

Seasonality

active from April to September, with peak densities in late May to early June. present from late April through mid-July. Larvae recorded year-round with continuous presence from July through May of the following year. occurs March–April, lasting 10–15 days. Highly overlapping developmental stages with no discrete breaks observed.

Diet

Larvae feed internally on hawthorn (Crataegus spp.) fruit flesh and seeds. feed externally on fruit tissues.

Host Associations

Crataegus mexicana - primary Most oviposited among eight tested accessions; medium and large-sized fruits preferred
Crataegus spp. - Five hawthorn documented as in Mexico; oviposition preference varies by fruit size and maturity status

Life Cycle

: deposited in small developing hawthorn fruits; incubation 3–5 days. Larva: bores through fruit flesh to reach and destroy seeds; recorded continuously from July through May. Pupa: formed in soil; occurs March–April, duration 10–15 days. : emerges from ; active April–September with overlapping .

Behavior

exhibit strong positive to fruit volatiles, with fruits proving more attractive than other plant parts or conspecifics in assays. Females demonstrate oviposition preference hierarchies based on fruit size (direct relationship) and maturity status (inverse relationship), preferring medium to large fruits. The shows highly overlapping cohorts with continuous recruitment rather than discrete .

Ecological Role

Primary consumer of hawthorn fruits; acts as a significant pest in agroecosystems, reducing fruit quality and yield through direct larval damage and premature fruit drop. No documented natural enemy relationships from available sources.

Human Relevance

Major pest of commercial hawthorn (tejocote) production in Mexico, causing economic losses through fruit damage and seed destruction. Research has focused on identifying attractive volatiles for potential monitoring or mass trapping applications. No established protocols specific to this have been published.

Similar Taxa

Conotrachelus nenupharClosely related congeneric with similar and ; distinguished primarily by range (C. nenuphar attacks Prunus, Malus, Pyrus, and Vaccinium versus C. crataegi specialization on Crataegus) and geographic strain structure (C. nenuphar shows clear /multivoltine geographic variation absent in C. crataegi)

More Details

Research gaps

The 2018 review article on C. nenuphar notes that Conotrachelus crataegi remains understudied compared to its , with no equivalent comprehensive biological review published. Most available information derives from localized studies in Mexican hawthorn production systems.

Taxonomic note

The 'quince curculio' is misleading as the does not attack Cydonia oblonga (true quince); 'hawthorn curculio' or 'tejocote curculio' would more accurately reflect associations.