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Publication #EENY258

Lesser Pumpkin Fly, Ethiopian Fruit Fly, Cucurbit Fly, Dacus ciliatus (Loew) (Insecta: Diptera: Tephritidae)1

H. V. Weems, Jr.2

Introduction

The lesser pumpkin fly, Dacus ciliatus (Loew), is also known as the Ethiopian fruit fly and the cucurbit fly. It is one of several fruit flies found in Africa and Asia, which could become serious pests of Florida agricultural crops if introduced into this state. This species has not been intercepted in the United States.

Throughout a large part of Africa and India this fruit fly is a common pest of cucurbits, although not as serious as the melon fly, Bactrocera curcurbitae Coquillett, in areas where both species occur. Heavy infestations of cucurbits by D. ciliatus have been reported in Egypt and in South Africa. Damage in some areas was mistaken for the similar injury caused by a closely related species, Dacus longistylus Wiedemann.

Synonyms

Dacus apoxanthus decolor Bezzi

Dacus brevistylus Bezzi

Dacus insistens Curran

Dacus sigmoides Coquillett

Didacus ciliatus (Loew)

Leptoxyda ciliata (Loew)

Tridacus mallyi Munro

Dacus sigmoides Coquillett

Distribution

Dacus ciliatus first was reported in India in 1914 and was collected first from Ombo, Upper-Egypt, in February 1953.

Dacus ciliatus occurs throughout most of eastern, southern, and central Africa, Malagasy Republic (Madagascar), Mauritius and Reunion Islands, the Arabian Peninsula, Pakistan, India, Bangladesh, and Sri Lanka (White and Elson-Harris 1994).

Description

Adult

The adult fly is 6 to 7 mm long, the body predominately dark fulvous yellowish-brown with pale yellowish markings on the thorax as viewed from above. Distinctive characteristics of the adult are the wing pattern, long third antennal segment, face with two large black spots and one brown spot on the peristome near the lower part of the eyes, and thorax with the scutum slightly darker than the rest of the body, with a median presutural line and two submedian postsutural black spots (very evident in alcoholic specimens, almost invisible in those preserved dry); humeral calli, suture, pleurae opposite the suture, hypopleural spot and the scutellum yellowish-white or ochraceous. Ovipositor of the female from above, 1.56 mm long, the tip without serration; many microspines form a band mid-length of the ovipositor sheath.

Figure 1. 

Adult female.


Credit:

Division of Plant Industry


[Click thumbnail to enlarge.]

Figure 2. 

Ovipositor tip.


Credit: Division of Plant Industry.
[Click thumbnail to enlarge.]

Egg

The egg is shiny white, about 2.5 mm long, slightly curved, cylindrical, and narrow at one end.

Larva

The larva is pure glistening white, except as appearances are altered by the color of the food within the alimentary canal. The third-instar larva, which is of typical maggot appearance, is about 8 mm long and 1.4 mm wide. The mandibular hooks of the mouth parts are provided each with a preapical tooth and oral lobes, which are well developed; each has 15 laminated ridges. Each anterior spiracle bears 14 to 16 lobes. The puparium is elliptical, brownish, about 4.5–5.5 mm long and 2–2.5 mm wide.

Life History

The complete life cycle typically requires 19 to 22 days as recorded under laboratory conditions at Coimbatore in Southern India. The egg stage lasts two to four days, the larval stage four to six days, the pupal stage eight to 10 days, and the preoviposition period at least four days. Three to four eggs usually are deposited in a single puncture made in the fruit by the ovipositor of the female fruit fly, but sometimes as many as eight eggs are deposited in a single hole, typically near the stalk. When 10 or more eggs are deposited in a single fruit, larvae usually do not obtain sufficient nourishment, resulting in undersized adults. Pupation takes place in the soil.

Host

Cucurbits are the principal hosts, with several other crops apparently of less importance. The lesser pumpkin fly has been recorded from balsampear, bean chayote, bluecrown passionflower, calabash gourd, citrus, common tomato, cucumber, cushaw, edible snakegourd, mata ratón (Gliricidia sepium), gooseberrygourd, horned melon, ivygourd, milkweed, muskmelon, pumpkin, redpepper, Singkwa towelgourd, watermelon, winter squash, and yellowflowergourd.

Attractants

This species is not attracted to cue lure, methyl eugenol, or vent lure (White and Elson-Harris 1994).

Selected References

Azab AK, Kira MT. 1954. Soc. Fouad IER d'Ent. Bull. 38: 379-382.

Bezzi M. 1915. Bulletin of Entomological Research 6: 85-101.

Cherian MC, Sundaram CV. 1939. Indian Journal of Agricultural Science 9: 127-131.

USDA, Survey and Detection Operations, Plant Pest Control Division, Agricultural Research Service. Anonymous. 1960. Insects not known to occur in the United States. Cooperative Economic Insect Report 10: 35-36. Lesser pumpkin fly (Dacus ciliatus (Loew)).

White IM, Elson-Harris MM. 1994. Fruit Flies of Economic Significance: Their Identification and Bionomics. CAB International. Oxon, UK. 601 pp.

White IM. (2000). Identification of peach fruit fly, Bactrocera zonata (Saunders), in the Eastern Mediterranean. The Natural History Museum. http://www-naweb.iaea.org/nafa/ipc/public/ipc-zonata-action-plan.pdf [7 June 2012].

Footnotes

1.

This document is EENY258, one of a series of the Entomology and Nematology Department, UF/IFAS Extension. Original publication date January 2004. Revised March 2012. Reviewed April 2015. Visit the EDIS website at http://edis.ifas.ufl.edu. This document is also available on the Feature Creatures website at http://entnemdept.ifas.ufl.edu/creatures/.

2.

H. V. Weems Jr., retired, Florida Department of Agriculture and Consumer Services, Division of Plant Industry, University of Florida, Gainesville, FL 32611.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.