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To Infestations of Asian Citrus Psyllid, (Hemiptera: Psyllidae) in Florida

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To Infestations of Asian Citrus Psyllid, (Hemiptera: Psyllidae) in Florida 608 Florida Entomologist 84(4) December 2001 NUMERICAL RESPONSE OF OLLA V-NIGRUM (COLEOPTERA: COCCINELLIDAE) TO INFESTATIONS OF ASIAN CITRUS PSYLLID, (HEMIPTERA: PSYLLIDAE) IN FLORIDA J. P. MICHAUD University of Florida, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33881 ABSTRACT Data are presented on the relative abundance of the coccinellid Olla v-nigrum (Mulsant) in Florida citrus, before and after invasion by the Asian citrus psyllid, Diaphorina citri Ku- wayama. Adults and larvae of O. v-nigrum were observed preying on immature psyllids throughout their range in Florida. Immature psyllids were eliminated by predation from many flushed citrus terminals that exhibited damage symptoms; pupae of O. v-nigrum and Harmonia axyridis Pallas were recovered from adjacent leaves. Olla v-nigrum, a relatively rare species before the invasion by D. citri, is now a dominant species throughout Florida in citrus groves where the psyllid is present, but remains rare in regions where D. citri is ab- sent. The strong numerical response of this native ladybeetle to D. citri populations indi- cates that it is assuming a key role in biological control of the psyllid. Key Words: abundance, biological control, coccinellids, Diaphorina citri, Harmonia axyridis, Olla v-nigrum RESUMEN Se presentan datos sobre la abundancia relativa del coccinélido Olla v-nigrum (Mulsant) en cítricos en la Florida, antes y después de la invasión del psílido Asiático, Diphorina citri Kuwayama. Adultos y larvas de Olla v-nigrum fueron observados alimentándose de las for- mas inmaduras del psílido a través de la Florida. Se observaron muchos brotes terminales en los cítrcos con daños del psílido, pero estos fueron eliminados por depredación; pupas de O. v- nigrum y Harmonia axyridis Pallas fueron coleccionadas en hojas adyacentes. Olla v-nigrum, una especie relativamente escasa antes de la invasión de D. citri, ahora es dominante en los cítricos de Florida donde está presente el psílido, pero sigue siendo escasa donde D. citri está ausente. La fuerte respuesta numérica de este coccinélido en comparación con las poblaciones de D. citri indica que está asumiendo un papel clave en el control biológico del psílido. The Asian citrus psyllid, Diaphorina citri Ku- beetle, Harmonia axyridis Pallas, can be found wayama, is the primary vector of citrus greening preying on D. citri throughout its range in Florida. disease in Asia (Catling 1970) and was first re- The ash-gray ladybeetle, O. v-nigrum, is an in- ported in Stuart, Florida in 1998 (Halbert et al. digenous coccinellid species inhabiting arboreal 1998). Originally discovered on hedges of Jasmine habitats throughout most of the United States Orange, Murraya paniculata (L.) Jack, the psyllid (Gordon 1985), Mexico (J. P. Michaud, unpub- spread to infest commercial citrus plantings lished), and through much of South America in- throughout St. Lucie, and Indian River counties, cluding Paraguay (Michel 1992), Argentina (Bado south to Miami-Dade, and eastward through & Rodriguez 1997) and Brazil (Fraga et al. 1986). Okeechobee in 1998. As of March 2001, it can be It occurs in light and dark forms, the dark form found throughout southwestern Florida (Lee, Col- predominating in Florida where it can easily be lier, and Hendry Counties) and northward along mistaken for the twice-stabbed ladybeetle, Chilo- the central ridge as far as southern Polk County corus stigma (Say). The latter is distinguishable (Alturas and Lake Wales). A relatively recent re- from O. v-nigrum by its generally smaller size, a port on the range of D. citri in Florida can be found recurvature of the edge of the elytra, and the lack in Halbert et al. (2000). Efforts have been under of a conspicuous white border along the edge of way to release and establish two exotic parasi- the pronotum. Although O. v-nigrum can be ob- toids, Tamarixia radiata (Waterston) and Dia- served feeding on various aphid species (Tedders phorencyrtus aligarhensis (Shafee, Alam and 1978, Edelson & Estes 1987) the ability of O. v-ni- Agaral) (Hoy & Nguyen 2001) that are reportedly grum to develop and reproduce on these aphids specific for D. citri (Tang 1990). This paper reports has not often been examined. However, it is also observations on a native coccinellid species, Olla renowned as a natural enemy of psyllids (Fraga et v-nigrum (Mulsant) (= Olla abdominalis (Say)), al. 1986) and can complete development on spe- that, together with the Asian multicolored lady- cies such as Heteropsylla cubana Crawford that Michaud: Biological Control of Asian Citrus Psyllid 609 are unsuitable food for many other generalist lows: Dade County (Homestead), 24-II-1997, 7-IV- predators (Chazeau et al. 1991). 1998, 13-V-1999; Collier County, 19-V-1997, 15- Although O. v-nigrum is attracted to colonies III-2001; Hendry County, 14-II-1998, 14-V-1998; of Toxoptera citricida (Kirkaldy) and Aphis spi- St. Lucie County, 21-IV-1997, 9-VII-1997, 15-II- raecola Patch and will feed on them (Michaud & 1998, 13-V-1998, 14-III-2001; Highlands County, Browning 1999), it is known that these aphid spe- 25-VII-1997, 21-III-1998, 21-III/2001; Polk cies do not support larval development, despite County, 18-III-1998, 18-V-1998, 27-X-1998, 8-III- the fact that viable eggs were produced by adult 2001, 21-III-2001, 27-III-2001. females fed T. citricida (Michaud 2000a). This in- The data from years 1997 and 1998 reflect coc- ability to develop on the primary citrus aphids cinellid abundance in Florida during a period may partially explain why the species has been when T. citricida and A. spiraecola were the pri- relatively rare in citrus until recently. Bado & Ro- mary prey available for aphidophagous coccinel- driguez (1997) reported life history data and prey lids in citrus. Since 1999, population densities of preference of O. v-nigrum feeding on various both aphid species have been very low compared aphid species including Schizaphis graminum to levels observed in previous years, probably due (Rondoni), Hyadaphis sp., Metopolophium dirho- to the numerical responses of predatory species dum (Walker), Uroleucon sp., Brevicoryne brassi- such as Cycloneda sanguinea L. and Harmonia cae L.and Myzus sp. Chazeau et al. (1991) axyridis Pallas that successfully develop and re- compiled a life table for O. v-nigrum feeding on H. produce on T. citricida (Michaud 2000a). Subse- cubana and concluded this psyllid was a highly quent to the invasion of D. citri, I returned to suitable prey species. Developmental and behav- many of the same groves to identify sources of ioral aspects of O. v-nigrum feeding on Psylla sp. mortality in psyllid colonies. In the course of are described by Kato et al. (1999). these observations, data were again collected on Preliminary observations in south Florida in the relative abundance of coccinellids by visual 1999 identified various indigenous predator spe- counts of adult beetles in the same manner as in cies attacking D. citri, including O. v-nigrum, and previous years. The body of data collected before late instar larvae of this species collected from 1999 now form a historical reference point for the D. citri colonies pupated successfully in the labo- relative abundance of O. v-nigrum before inva- ratory and yielded viable adults (Michaud 2000b). sion by the Asian citrus psyllid. Data on O. v-ni- More recent observations reveal that populations grum abundance in the presence and absence of of O. v-nigrum have apparently exploded wher- D. citri, as a proportion of total coccinellids ob- ever psyllids are present in citrus. This paper re- served, were compared by means of a ‘2 × r’ con- ports on the increase in relative abundance of tingency table analysis (SAS Institute 1998). O. v-nigrum in apparent response to the avail- ability of D. citri as a new food source. RESULTS AND DISCUSSION MATERIALS AND METHODS The historical data on the abundance of O. v- nigrum relative to other coccinellids and thaose From 1996 to 1998 the commercial citrus- from recent observations are presented in Fig. 1. growing regions of Florida were invaded by the The data are representative of the four major cit- brown citrus aphid, Toxoptera citricida (Kirkaldy) rus-producing regions of the state: south Florida and, as part of a survey of predators attacking (Dade County), southwestern Florida (Collier and T. citricida, a series of observations was made on Hendry Counties), the Indian River District (St. the relative abundance of coccinellid species in Lucie County) and the central ridge district these regions. Flowering and flushing citrus trees (Highlands and Polk Counties). In all regions are attractive to many coccinellid species. Adult where psyllids are now present, O. v-nigrum has beetles can be found feeding on pollen and nectar increased significantly as a proportion of total of citrus flowers in the spring. Many potential coccinellids (Dade County: χ2 = 56.468, 2df, P < prey species, including aphids and leaf miners, at- 0.001; Collier County: χ2 = 24.922, 1df, P < 0.001; tack newly expanding citrus terminals. Conse- Hendry County: χ2 = 15.923, 2df, P < 0.001; St. Lu- quently, citrus groves were selected based on the cie County: χ2 = 44.531, 4df, P < 0.001; Highlands presence of flowering and/or flushing trees and County: χ2 = 80.415, 2df, P < 0.001; Polk County: these trees were examined selectively. Relative χ2 = 116.944, 5df, P < 0.001). coccinellid abundance was estimated by visual The data represented in Fig. 1 for Spring 2001 counts of adult beetles on whole trees. Observa- in Polk County were collected from a very recent tion periods ranged from 40 minutes to 2 hours at psyllid infestation just south of Lake Wales. Two each site. Voucher specimens were collected and additional sites further north in Polk County identified by M.
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