Lobiopa insularis

(Laporte de Castelnau, 1840)

strawberry sap beetle

Lobiopa insularis is a sap-feeding beetle in the Nitidulidae, widely distributed across the Americas from North America through Central America to South America and the Caribbean. It is a significant agricultural pest of strawberry and other soft fruits, causing direct feeding damage and indirect losses through fungal . The has been extensively studied for its , , and control options, including using and .

Lobiopa insularis by no rights reserved, uploaded by Kahio Tiberio Mazon. Used under a CC0 license.

Pronunciation

How to pronounce Lobiopa insularis: //loʊˈbaɪəpə ɪnˈsuːlərɪs//

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Identification

is present in terminal abdominal segments: males possess a triangular and angulate hypopygidium, while females have a membranous pygidium without triangular projection and broad hypopygidium. These morphological differences allow precise sex identification using stereomicroscopy.

Images

Habitat

Agricultural crops, particularly strawberry fields; natural include subcortical spaces of dead or decaying trees, sap flows, fermenting fruit, flower falls, and decomposing leaf litter. Oviposition occurs in soil at approximately 1 cm depth, not on fruit.

Distribution

Caribbean Sea, Central America, North America, and South America; specifically documented in Brazil (São José dos Pinhais, Paraná), Argentina (Buenos Aires province), and the United States.

Diet

Frugivorous: feeds primarily on ripe strawberry fruits; also documented on melon, blueberry, raspberry, pineapple, apple, peach, fig, tomato, corn, and dried fruit products. In natural , feeds on subcortical fungi and serves as fungal agent.

Host Associations

Fragaria × ananassa - food plantprimary agricultural
Cerchysiella insularis - gregarious endoparasitoid ; rates 33.85-45.90% in strawberry crops in Brazil
Heterorhabditis bacteriophora - ; VEli strain pathogenic to larvae, pupae, and

Life Cycle

→ three larval instars → pupa → . Preimaginal stages represent approximately 18.5% of total duration; adult stage approximately 81.5%. Egg-to-adult survival 64.20%. Larvae develop inside strawberry fruits, then fall to ground and bury to pupate.

Behavior

Mating sequence involves three stages: pre-copulation (male approaches female laterally, vibrates hind legs, touches female with ), copulation (male trembles with everted for approximately 5 seconds), and post-copulation (male maintains guarding position over female for less than 1 minute). Females only oviposit when males are present, indicating paternity protection . disperse long distances and overwinter. Strong attraction to ripe fruits in agricultural settings.

Ecological Role

Agricultural pest causing 20-70% economic losses in severe strawberry ; direct feeding damage to ripe fruits and indirect damage through spread of rot-causing microorganisms. In natural , functions as subcortical mycophagous contributing to decomposition. Serves as for agents including and .

Human Relevance

Major pest of strawberry in Brazil and Argentina; chemical control difficult due to harvest frequency and residue concerns on edible fruits. Subject of research using Cerchysiella insularis and Heterorhabditis bacteriophora .