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Greenideinae : Greenideini : Greenidea psidii
 

 

Greenidea psidii

Hairy-tailed guava aphid

On this page: Identification & Distribution Other aphids on the same host Damage & Control

Identification & Distribution

Adult apterae of Greenidea psidii (see pictures below) are pear-shaped, shiny dark reddish or yellowish brown with a dark brown band on the anterior part of the dorsal abdomen; the siphunculi are yellowish brown, darker at the base and apex, and curved outwards distally. The head, body and siphunculi are covered with long hairs, most of the dorsal hairs being stout with branched or multi-lobed apices. The antennae are 0.84-1.3 times the body length, with the terminal process 1.9-2.8 times the base of antennal segment VI. The longest hairs on antennal segment III are 2.8-3.7 times the basal diameter of that segment. The apical rostral segment (RIV+V) is 1.8-2.2 times the second hind tarsal segment (HTII). The siphunculi are 0.26-0.42 times the body length, and are ornamented with irregularly spaced spinules; they have reticulation only at their bases (cf. Greenidea ficicola, which has reticulations covering most of the length of the siphunculi). The cauda has 7-11 (mostly 8) hairs. The body length of Greenidea psidii apterae is 1.5-2.4 mm.

Images above copyright Jesse Rorabaugh under a public domain (CC0) licence.

Alatae of Greenidea psidii have 23-26 secondary rhinaria on antennal segment III, some crowded and not in line with the others, and often touching. The abdomen has transverse bands dorsally, those on tergites III-V are connected to each other and tergite VII with a semicircular band. The siphunculi are weakly reticulated except for the apical part, almost cylindrical and 0.66-0.77 times the body length.

The image below shows a clarified mount of an apterous vivipara Greenidea psidii.

Image above copyright Jesse Rorabaugh under a public domain (CC0) licence.

Greenidea psidii feeds on the young shoots and undersides of young leaves of guava (Psidium guajava) and other members of the myrtle family (Myrtaceae) such as Rhodomyrtus, Eugenia, paperbarks (Melaleuca), and Plinia. It is a pest of considerable importance in some parts of the world on guava, but has not been implicated in the transmission of any plant virus. Greenidea psidii may be restricted to Myrtaceae, but similar aphids occur on other plants such as Ficus and Engelhardtia. Sexual morphs are unrecorded, and parthenogenetic morphs are known occur all-year-round in some countries. Greenidea psidii is originally Indo-Asian, including the Philippines, Sumatra, Taiwan, and Australia. It has been introduced into the Western Hemisphere, and is now present in North, Central & South America.

 

Other aphids on the same host

Greenidea psidii has been recorded on 3 Psidium species (Psidium cattleianum, Psidium friedrichsthalianum, Psidium guajava).

Greenidea psidii has been recorded on 2 Eugenia species (Eugenia operculata, Eugenia tetragona).

Acknowledgements

We thank Jesse Rorabaugh for the various images shown. We have used the keys and species accounts of Sugimoto (2008) (as Greenidea formosana), supplemented with Halbert (2004) & Hidalgo et al. (2009), together with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. We fully acknowledge these authors, and those listed in the reference sections, as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure provided by Blackman & Eastop (2006).

Useful weblinks

References

  • Halbert, S.E. (2004). The genus Greenidea (Rhynchota : Aphididae) in the United States. Florida Entomologist 87(2), 159-163. Full text

  • Hidalgo, N.P. et al. (2009). Greenidea psidii (Hemiptera: Aphididae: Greenideinae) new invasive aphid in Costa Rica. Florida Entomologist 92(2), 396-398. Full text

  • Sugimoto, S. (2008). A revision of the genus Greenidea Schouteden in Japan (Homoptera: Aphididae: Greenideinae). Insect Matsumurana 64, 53-79. Full text