Anastrepha bistrigata

Common name  

Guava fruit fly

Description

Typical of Anastrepha larvae with the following specific characteristics for the third instar:

Body. Length up to 9.6mm long and width up to 2.2 mm.

Head. Number of oral ridges usually 8–9 (range 7–10).

Cephalopharyngeal skeleton. Mandible length from tip to dorsal prominence 0.31-0.37 mm; hypopharyngeal sclerite 0.20-0.25 mm long; dorsal cornu with well-defined sclerotized area 0.47-0.62 mm long, ventral cornu 0.83 mm long from pharyngeal bar to posterior end of grooves.

Spinules and creeping welts. Dorsal spinules on segments T1-A2, or T1-A3, or T1-A4, or T1-A5.

Anterior spiracles. Anterior spiracular tubules usually 14–17 (range 13–20); in a single irregular row; distal width 0.21-0.31 mm.

Caudal segment (A8) and anal lobes. Anal lobes prominently protuberant, bifid (occasionally entire).

Posterior spiracles. Length of dorsal and ventral rimae 96–130µm; slits 3.3–4.4x longer than wide. Dorsal spiracular processes (SPI) usually with 16–20 trunks (range 14–26) and 25-34 tips (range 22-39), basal width 29-55 µm, 0.3-0.5 times length of spiracular slit. Lateral spiracular processes SPII with 6–8 trunks and 10-16 tips (range 9-22) and SPIII with 10-14 trunks (range 8–14) and 15-23 tips (range 15-27). Ventral spiracular processes (SPIV) usually with 11–19 trunks (range 11–20) and 20-31 tips (range 20-35), basal width 19-48 µm.

Similar species

Not readily separated from larvae of Anastrepha striata based on features visible using an optical microscope. A discriminant function was developed to separate larvae of these two species, but the error rate may be high (Steck et al., 1990)

Linear discriminant function. Anastrepha striata vs. A. bistrigata: C = 23.5log(BAS) – 0.75(ANS) – 0.63(TRK) – 15: C less than 0 indicates A. bistrigata. [where BAS = basal width of SP-1; ANS = number of anterior spiracular tubules; TRK = number of trunks]

Host plants

Family	Genus / species	Common name
Myrtaceae	Psidium guajava	common guava
	P. guieense	Brazilian guava
	P. australe
Sapotaceae	Pouteria gardneriana

Only guava (Psidium spp.) are likely to be encountered as hosts of A. bistrigata.

Part of plant attacked: fruit.

Biogeographic region and distribution

Neotropical

South America: Brazil (Goias, Minas Gerais, Sao Paulo).

Status of knowledge

There is only one published description of the immature stages of A. bistrigata. It includes the egg, 1st instar, 2nd instar and 3rd instar larvae. The description is  based on slide-mounted material (Steck and Malavasi 1988). It includes drawings but no photomicrographs or SEM images. These data were incorporated into the keys of Steck et al. (1990) and White and Elson-Harris (1992).

Specimens examined

Brazil: University of Sao Paulo, ex laboratory culture, n=23.

Adult taxonomy

Anastrepha bistrigata Bezzi
Anastrepha bistrigata Bezzi 1919: 7.—Brazil. Sao Paulo: Bauru. ST ♂♀ MCSNM. Type data (Bezzi 1919: 373).

References

Carroll, L. E., A. L. Norrbom, M. J. Dallwitz, and F. C. Thompson. 2004 onwards. Pest fruit flies of the world – larvae. Version: 8th December 2006. http://delta-intkey.com.

Steck, G. J., and A. Malavasi. 1988. Description of immatures stages of Anastrepha bistrigata (Diptera: Tephritidae). Ann. Entomol. Soc. Am. 81: 1004-1009.

Steck, G. J., L. E. Carroll, H. Celedonio H. & J. C. Guillen A. 1990. Methods for identification of Anastrepha larvae (Diptera: Tephritidae), and key to 13 species. Proc. Entomol. Soc. Wash. 92: 333-346.

White, I. M. and M. M. Elson-Harris. 1992. Fruit Flies of Economic Significance: Their Identification and Bionomics. International Institute of Entomology, London. xii + 601 p.