Bedellia somnulentella

(Zeller, 1847)

sweet potato leaf miner, morning-glory leafminer moth

Bedellia somnulentella is a microlepidopteran leaf-mining in the Bedelliidae, native to Asia and now nearly in distribution. It is a significant agricultural pest of sweet potato (Ipomoea batatas) and related Convolvulaceae, with larvae feeding on leaf mesophyll and reducing photosynthetic capacity. The has expanded its range through association with cultivated crops and maintains on wild Ipomoea species during off-season periods. It has been documented across Europe, Asia, Africa, the Americas, and Oceania.

Bedellia somnulentella by no rights reserved, uploaded by Miranda Kohout. Used under a CC0 license.

Bedellia somnulentella by (c) Ken-ichi Ueda, some rights reserved (CC BY), uploaded by Ken-ichi Ueda. Used under a CC-BY license.

- 0466 – Bedellia somnulentella – Morning-glory Leafminer Moth? (10638424105) by Andy Reago & Chrissy McClarren. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Bedellia somnulentella: //bɛˈdɛl.i.ə səmˌnʊl.ənˈtɛl.ə//

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

Identification

identifiable by small size (8–10 mm wingspan) and -typical narrow wing . Larvae identifiable from third instar onward by leaf-mining damage on Convolvulaceae . Pupae and adults can be identified through rearing from collected larvae. Mines begin as serpentine trails and enlarge to blotches; late instar larvae may feed externally.

Images

Habitat

Agricultural fields cultivating sweet potato and other Ipomoea ; weedy areas and field margins with wild Convolvulaceae including morning-glories and bindweeds. In Brazil, documented in Atlantic Forest biome as well as agricultural settings. Climate-controlled laboratory conditions support complete development, indicating adaptability to varied environments provided plants are present.

Distribution

Native to Asia; now nearly . Recorded from Russia, Ukraine, Georgia, southern Kazakhstan, Kyrgyzstan, Uzbekistan, nearly all of Europe, Middle East, Africa, India, Japan, North America, Australia, New Zealand, and Oceania. In the Americas: Brazil (Minas Gerais state, with multiple municipalities; Atlantic Forest biome), USA (Florida, North Florida specifically documented 2025).

Diet

Phytophagous; larvae feed on leaf mesophyll of plants in Convolvulaceae. Primary commercial is Ipomoea batatas (sweet potato). Additional documented hosts include Ipomoea alba, I. cairica, I. hederifolia, I. indica, I. purpurea, I. tricolor, Distimake dissectus var. edentatus, and wild Calystegia and Convolvulus including C. pubescens, C. sepium, C. althaeoides, C. arvensis, C. siculus.

Host Associations

Ipomoea batatas - primary Commercial sweet potato; main agricultural pest target
Ipomoea hederifolia - alternative Wild supporting survival during off-season; high survival and development rates comparable to I. batatas
Ipomoea indica - alternative Wild ; lower survival and development rates than on I. batatas or I. hederifolia
Ipomoea purpurea - alternative Wild ; lower survival and development rates
Ipomoea alba - alternative Documented in Brazil
Ipomoea cairica - alternative Documented in Brazil
Distimake dissectus var. edentatus - alternative New record in Atlantic Forest biome, Brazil
Calystegia pubescens - alternative Native Asian
Calystegia sepium - alternative Hedge bindweed
Convolvulus arvensis - alternative Field bindweed
Convolvulus althaeoides - alternative
Convolvulus siculus - alternative
Convolvulus tricolor - alternative

Life Cycle

Complete with five stages: , larva, , pupa, . Eggs laid singly on undersurface of leaves. Larval development includes three instars; cephalic capsule width measured to determine instar number following . Prepupal and pupal stages occur in silken cocoon on leaf surface or in soil. Total developmental period approximately 32.5 days under laboratory conditions (25°C). Viability: egg 75%, larva 84%, prepupa 100%, pupa 84%. Multiple per year in suitable climates.

Behavior

Larvae are leaf miners, creating serpentine mines that enlarge to blotches as feeding progresses. Late instar larvae may feed externally on leaf tissue. occurs in silken cocoon either attached to leaf surface or in soil. are active fliers capable of dispersing to new patches. persist through off-season periods on wild alternative hosts, enabling rapid recolonization of cultivated fields.

Ecological Role

Herbivore and agricultural pest. Larval feeding reduces photosynthetic area of plants, causing leaf browning and wrinkling, with documented impacts on chlorophyll fluorescence and plant productivity. Serves as host for Conura sp. (Hymenoptera: Chalcididae) and prey for social Agelaia vicina (Hymenoptera: Vespidae), contributing to local connections.

Human Relevance

Significant economic pest of sweet potato globally. reduce photosynthetic capacity and yield, with heavy infestations causing substantial crop damage. Management requires monitoring and strategies including agents. Early detection emphasized to prevent establishment and spread, minimizing use. First formal records in new regions (e.g., North Florida 2025) trigger agricultural monitoring responses.

Similar Taxa

Other Bedellia speciesSame and ; require genitalia examination or molecular analysis for definitive identification
Lyonetia spp. (Lyonetiidae)Related with similar leaf-mining larvae; distinguished by and mine patterns

More Details

Parasitoids and Biological Control

Conura sp. (Hymenoptera: Chalcididae) identified as of pupae in Brazil, with potential for . Agelaia vicina (Vespidae) documented as of larvae and pupae in Atlantic Forest.

Developmental Plasticity

Larval coloration varies with plant (observed differences between I. hederifolia, I. indica, I. purpurea). Survival and development rates differ significantly across host , with I. batatas and I. hederifolia supporting highest .

Invasive Status

Considered in tropical sweet potato production regions outside native Asian range. Distribution expansion documented through formal surveys in Brazil and USA.