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Anastrepha edentata and other fruit flies (Diptera: Tephritidae) detected on Key Largo, Florida.

Several Anastrepha species (Diptera: Tephritidae) are quarantine pests of commercial fruits in the New World. Florida is home to one such pest, the introduced Anastrepha suspensa (Loew) (Caribbean fruit fly), plus three other Anastrepha species that are not considered of economic importance (Foote et al. 1993; Sutton & Steck 2005). One of these latter species, Anastrepha edentata Stone, is particularly mysterious, as no host has ever been reported from anywhere in its known range of South Florida and Puerto Rico (Norrbom 2004). We attempted to document its phenology and discover its host(s) through bait trapping and rearing from fruit collections in Dagny Johnson Key Largo Hammock Botanical State Park, Key Largo, Florida, during 1994-1996. Some fruit samples were also taken from Long Key State Park, Long Key, Florida, during the same period and during earlier periods. Both areas are subtropical West Indian hardwood forests.

Ten to 16 plastic McPhail traps baited with torula yeast/borax tablets dissolved in water were suspended on the branches of small trees. Traps were hung 2 m off the ground, placed at 50-100-m intervals along a narrow, unpaved trail in the park, and were checked weekly from 25 Feb 1994 to 23 Feb 1996. In total, 21 A. edentata adults were trapped on 10 different occasions (Table 1). This is the first substantial collection of the species since 1934-1937, when the fly was first discovered and trapped in relatively large numbers during an intensive fruit fly survey in South Florida (Brown 1937; Clark et al. 1996). The fly has been captured on only a handful of other occasions (see Norrbom 2007 and records of the Florida Department of Agriculture, Division of Plant Industry (FDACS/ DPI) and Florida State Collection of Arthropods (FSCA)), despite extensive, routine fruit fly trapping in nearby suburban Key Largo plus other Florida Keys and large areas of Monroe and Miami-Dade Counties by the FDACS/DPI and the United States Department of Agriculture (USDA).

The accumulated records of the last 70+ years allow us to visualize the phenology of A. edentates. This is shown in Fig. 1, which is based on 81 collection records from the U.S. National Museum of Natural History (NMNH) (Norrbom 2007) and the FSCA. As first noted by Stone (1942), the fly is present in every month of the year. The accumulated records indicate a bimodal distribution of abundance. The largest peak occurs in Sep, after which the numbers of monthly records gradually decline to a relative low in Feb, followed by a second, smaller peak in Mar-Apr. The fewest records are in the months of Jun and Jul. Fruits from 22 identified plant species were collected based on availability from 1992 through 1995. Fruits (mature and immature, damaged and undamaged) were harvested from plants, placed into mesh bags, held in a cooler with ice, and transported to the ARS laboratory at Miami within 4 h of collection. Fruits were counted, placed into trays on vermiculite, and covered with organdy cloth. Vermiculite was sifted weekly until fruit was completely desiccated. Pupae were held in vermiculite in Petri dishes at 23-26[degrees]C, 70-80% RH, and a 14:10 light:dark regime until adult emergence. Percentage emergence and sex ratio data were not taken.

[FIGURE 1 OMITTED]

Fruit collection months below were from Key Largo except where Long Key or Homestead is noted. Fruit collections included: Olacaceae: hog plum, Ximenia americana L. (1684 fruit; Jun, Nov, Dec, 1992; Jun, Jul, Aug, 1994; May, 1995), gulf graytwig, Schoepfia shreberi J. F. Gmel. (2356 fruit; Jan, Feb, Mar, Apr, 1993; Feb, Mar, 1994; Long Key, Feb, Mar, 1993); Myrcinaceae: marlberry, Ardisia escallonioides Schlecht. & Cham. (350 fruit; Mar, 1994); Rubiaceae: smooth wild coffee, Psychotria ligustrifolia (Northrop) Millsp. (234 fruit; Feb, 1993; Apr, Dec, 1994), White indigo, Randia aculeata L. (100 fruit; Mar, 1994), Cheese shrub, Morinda royoc L. (92 fruit; Jul, 1994), Rough velvetseed, Guettarda scabra (L.) Vent. (289 fruit; Sep, Oct, 1994), Everglades velvetseed, Guettarda elliptica Sw. (314 fruit; Sep, 1995), Snowberry, Chiococca alba (L.) Hitchc. (2306 fruit; Jan, Feb, 1993; Sep, Dec, 1994; Sep, 1995); Polygonaceae: pigeon plum, Coccoloba diuersifolia Jacq. (646 fruit; Apr, Dec, 1994; Janaury, Mar, 1995); Rhamnaceae: darling plum, Reynosia septentrionalis, Vrb. (542; Jun, Jul, 1994; May, 1995); Passifloraceae: passion fruit, Passiflora suberosa L. (31 fruit; Jan, 1993; Jul, Sep, 1994); Polygonaceae: sea grape, Coccoloba uuifera (L.) L. (711 fruit; Jul, Sep, 1994); Ehretiaceae: rough strongbark, Bourerria succulenta, Jacq. var. revoluta (HBK) E E. Schultz (1038 fruit; Jan, Feb, 1993; Aug, Sep, 1994); Sapotaceae: willow bustic, Dipholis salicifolia (L.) Sw. (677 fruit; Sep, 1994; Sep, 1995); Rutaceae: torchwood, Amyris elemifera L. (25 fruit; Oct, 1994); Moraceae: shortleaf fig, Ficus citrifolia Mill. (316 fruit; May, Sep, 1994); Sapindaceae: white ironwood, Hypelate trifoliata Sw. (415 fruit; Sep, 1994); Myrtaceae: Surinam cherry, Eugenia uniflora L. (1126 fruit; Homestead, May, 1995); Myrtaceae: white stopper, Eugenia axillaris (Sw.) Willd. (121 fruit; Mar, 1995); Caricaceae: papaya, Carica papaya L. (12 fruit; Apr, 1995); and Malpighiaceae: Barbados cherry, Malpighia emarginata DC. (60 fruit; Homestead, May, 1995). None of the fruit collections yielded A. edentata specimens. Anastrepha suspensa adults were reared from hog plum for the first time. Eight adults emerged from 315 fruits collected VI/17/1994. Previously A. suspensa had been reared from over 80 other fruits, including papaya, Barbados cherry and Surinam cherry which we sampled (Norrbom 2004). There were 149 and 44 A. suspensa adults reared from Barbados cherry and Surinam cherry, respectively, and none from papaya. The infestation rate in hog plum was low, with only one infested fruit out of 11 collections. Additionally, only 11 A. suspensa were trapped (Table 1). This widespread and abundant pest of residential, agricultural, and other disturbed areas clearly is not a common denizen of the native subtropical West Indian hardwood hammocks of Florida. Another common fruit pest in Florida, Toxotrypana curuicauda, was trapped on two occasions but none was reared from papaya fruit. It is an important pest of papaya in Florida and other areas of the Neotropics (Weems 1969; Norrbom 2004).

The failure to regaA. interrupta Stone was surprising, as we collected fruits of its host, gulf graytwig, on numerous occasions during its known flight period (Pereira et al. 2007). We regularly found few mature gulf graytwig fruits but many immature fruits on the plants. We assumed that birds and other wildlife regularly consumed the fruits as they matured, leaving the immature fruits behind. Thus, fruit-eating vertebrates could be important natural enemies of A. interrupts larvae in Florida. This phenomenon was also observed by Drew (1987) who noted that up to 77% of Solanum mauritianum Scop. fruits, the host of Dacus cacuminatus Hering (Diptera: Tephritidae) was consumed by brown pigeons, Macropygia phasianella (Temminck). He concluded that fruiteaters were the major natural enemies of tephritid flies in endemic habitat in Queensland. Pereira et al. (2007) discovered that A. interrupta larvae are seed-feeders in gulf graytwig fruits and infested fruits do not mature, thus, they would appear unripe (green) on the plant and they may well drop prematurely. Nearly all of the gulf graytwig fruit that we sampled were mature (purple) and, therefore, possibly infested green fruits were under-sampled. Under-sampling, along with frugivory, may explain not detecting A. interrupta larvae in the fruits. Ripe hog plums (X. americana), another Olacaceae species that we sampled, were not infested with A. interrupta larvae, but were infested with A. suspensa larvae.

From the adult phenology, we can surmise that A. edentata is at least bivoltine and more likely multi-generational in Florida. In this regard, it is similar to A. interrupta, which also has been found in all months of the year and at lowest frequency during Jun-Jul. Even though A. interrupta is restricted to a single host, its populations can persist year-round probably due to long adult lifespan (up to nearly half a year in the laboratory) and at least sporadic fruiting of the host throughout the year (Pereira et al. 2007). As the host(s) ofA. edentates has not yet been discovered, we cannot say whether its populations persist in like manner to A. interrupta, or whether it makes use of multiple host plants to span the seasons.

All collecting and trapping activities were conducted under Florida Department of Environmental Protection permits 93-3, 94-2, and 95-1. We thank W Montgomery and R. Pantaleon for assistance in sampling, C. R. Artaud, J. Nemec, and G. C. Steyskal for assistance in plant and insect identifications, and J. Nemec, J. M. Parks, R. H. Skinner, and R. Wilhelm of the Florida Department of Environmental Protection, Division of Recreation and Parks, for cooperation. Voucher specimens of plants and insects were retained at DPI, Gainesville; photographs of fruits and plants identified by J. Nemec in the field were retained by Walter Gould. This is Entomology Contribution No. 1076, Bureau of Entomology, Nematology, and Plant Pathology, FDACS-DPI.

SUMMARY

A concerted effort was made to collect Anastrepha edentata Stone with McPhail traps in native hammock forest of Key Largo over a 2-year period, which yielded the largest collection in over 70 years. The phenology of the fly, based on all known Florida collection records, is illustrated and indicates that the fly is at least bivoltine and probably multivoltine. Fruit (9000 total) obtained from 22 different potential host plants failed to produce adults of A. edentata, and its host remains unknown. Anastrepha suspensa (Loew) and Toxotrypana curuicauda Gerstaecker were also trapped, andA. suspensa was reared from Ximenia americana L. (Olacaceae) for the first time. Comments on Anastrepha interrupta Stone are also included.

REFERENCES CITED

BROWN, A. C. 1937. Report of the grove inspection department. State Plant Board Florida Biennial Rep. 11:15-21.

CLARK, R. A., STECK, G. J., AND WEEMS, JR., H. V. 1996. Detection, quarantine, and eradication of fruit flies in Florida, pp. 29-54 In D. Rosen, F. D. Bennett, and J. L. Capinera [eds.], Pest Management in the Subtropics: Integrated Pest ManagementA Florida Perspective. Intercept Ltd., Andover, UK.

DREW, R. A. I. 1987. Reduction in fruit fly (Tephritidae: Dacinae) populations in their endemic rainforest habitat by frugivorous vertebrates. Australian J. Zool. 35: 283-288.

FOOTE, R. H., BLANC, F. L., AND NORBOMM, A. L. 1993. Handbook of the Fruit Flies (Diptera: Tephritidae) of America North of Mexico. Cornell University Press, Ithaca, NY, USA. 571 pp.

NORRBOM, A. L. 2004. Host Plant Database for Anastrepha and Toxotrypana (Diptera: Tephritidae: Toxotrypanini). Diptera Data Dissemination Disk (CDROM) 2: 5,984 records.

NORRBOM, A. L. (Ed.). 2007. E Louie Blanc New World Fruit Fly Specimen Database (http:// wwwsel.barc.usda.gov:591/diptera/ Tephritidae/ TephIntro.html, accessed on 18 Apr 2007.

PEREIRA, R., STECK, G. J., VARONA, E., AND SIVINSKI, J. 2007. Biology and natural history of Anastrepha interrupta (Diptera: Tephritidae). Florida Entomol. 90: 389-391.

STONE, A. 1942. The Fruit Flies of the Genus Anastrepha (Miscellaneous Publication No. 439) U.S. Department of Agriculture, Washington, DC, USA. 112 PP.

SUTTON, B. D., AND STECK, G. J. 2005. An annotated checklist of the Tephritidae (Diptera) of Florida. Insecta Mundi 19: 227-245.

WEEMS, H. V., JR. 1969. Papaya Fruit Fly (Toxotrypana curvicauda Gerstaecker), 1860. Entomology Circular No. 86, Florida Dept. ofAgriculture and Consumer Services, 2 pp.

MICHAEL K. HENNESSEY (1), WALTER P. GOULD (2) AND GARY J. STECK (3)

(1) United States Department of Agriculture, Animal and Plant Health Inspection Service, Plant Protection and Quarantine, Center for Plant Health Science & Technology, 1730 Varsity Drive, Suite 400, Raleigh, NC 27606-5202

(2) United States Department of Agriculture, Animal and Plant Health Inspection Service, Plant Protection and Quarantine, 4700 River Road, Riverdale, MD 20737

(3) Florida State Collection of Arthropods, P.O. Box 147100, Gainesville, FL 32614
TABLE 1. MCPHAIL TRAP (10-16 TRAPS) COLLECTIONS OF ANASTREPHA AND
TOXOTRYPANA ADULTS IN NATIVE HAMMOCK FOREST, KEY LARGO, FLORIDA

                                1994
             A.edentata                  other
               Males       Females       Males      Females
Jan              ns           ns           ns          ns
Feb              0            0            0           0
Mar              2            4            0           0
Apr              3            2            0           0
May              0            1            0          7 *
Jun              0            0            0           0
Jul              0            0           1 **         0
Aug              0            1            0          1 *
Sep              0            3            0          2 *
Oct              0            0            0           0
Nov              0            0            0           0
Dec              0            0            0           0

                             1995
             A. edentata                 other
               Males       Females       Males      Females
Jan              1            1            0           0
Feb              0            0            0           0
Mar              0            1            0           0
Apr              0            0           1 **         0
May             1 *           0            0           0
Jun              0            0            0           0
Jul              0            0            0           0
Aug              0            0            0           0
Sep              0            2            0           0
Oct              0            0            0           0
Nov              0            0            0           0
Dec              0            0            0           0

                             1996
             A. edentata
               Males       Females
Jan              0            0
Feb              0            0
Mar              ns           ns
Apr              ns           ns
May              ns           ns
Jun              ns           ns
Jul              ns           ns
Aug              ns           ns
Sep              ns           ns
Oct              ns           ns
Nov              ns           ns
Dec              ns           ns

ns = not sampled.

* A. suspensa.

** T. curvicauda.
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Title Annotation:Scientific Notes
Author:Hennessey, Michael K.; Gould, Walter P.; Steck, Gary J.
Publication:Florida Entomologist
Article Type:Report
Geographic Code:1USA
Date:Mar 1, 2009
Words:2129
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