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Hesperomyces Virescens Between Lady Beetles

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Hesperomyces Virescens Between Lady Beetles Hindawi Publishing Corporation Psyche Volume 2012, Article ID 814378, 7 pages doi:10.1155/2012/814378 Research Article Limited Transmission of the Ectoparasitic Fungus Hesperomyces virescens between Lady Beetles Ted E. Cottrell 1 andEricW.Riddick2 1 Southeastern Fruit and Tree Nut Research Laboratory, Agricultural Research Service, United States Department of Agriculture, GA 31008, USA 2 National Biological Control Laboratory, Agricultural Research Service, United States Department of Agriculture, Stoneville, MS 38776, USA Correspondence should be addressed to Ted E. Cottrell, [email protected] Received 21 September 2011; Revised 11 January 2012; Accepted 11 January 2012 Academic Editor: Ai-Ping Liang Copyright © 2012 T. E. Cottrell and E. W. Riddick. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The ectoparasitic fungus Hesperomyces virescens Thaxter (Ascomycota: Laboulbeniales) commonly infects the invasive lady beetle Harmonia axyridis (Pallas) and several other aphidophagous lady beetles in North America and Europe. We tested the hypothesis that bodily contact between adults of different lady beetle species supports horizontal transmission of H. virescens.Weused laboratory assays to determine whether H. axyridis or Olla v-nigrum (Mulsant) harboring H. virescens (i.e., source beetles) transmit the fungus to noninfected target beetles H. axyridis, O. v-nigrum, Coccinella septempunctata L., Coleomegilla maculata (De Geer), or Hippodamia convergens Guerin-Meneville. Results indicate that intraspecific transmission (i.e., for the source beetles H. axyridis and O. v-nigrum) was common but interspecific transmission (i.e., from source H. axyridis or O. v-nigrum to target species) was low. Interspecific transmission occurred at low rates from H. axyridis to both C. septempunctata and O. v-nigrum and from O. v-nigrum to both C. septempunctata and H. convergens. Based upon our laboratory assays of forced pairings/groupings of source and target beetles, we predict that horizontal transmission of H. virescens between species of aphidophagous coccinellids is possible but likely rare. 1. Introduction Known coccinellid hosts of H. virescens include Adalia bipunctata (L.), Brachiacantha quadripunctata Melsheimer, Laboulbeniales (Ascomycota) are ectoparasitic fungi and Chilocorus stigma (Say), Chilocorus bipustulatus (L.), Eri- nearly all 2,000 described species are obligate parasites that opis connexa Germar, Cycloneda munda (Say), Cycloneda grow on the integument of living arthropods, mostly in- sanguinea (L.), Coccinula crotchi (Lewis), Coccinula sinensis sects, and usually on the adult stage [1, 2]. Within the ten Weise,CoccinellaseptempunctataL.,Hippodamiaconvergens insect orders that contain host species, about 80% of these Guerin-Meneville, Harmonia axyridis (Pallas), Olla v-nigrum parasitic fungi are on beetles (Coleoptera) [2]. Of partic- (Mulsant), and Psyllobora vigintimaculata (Say) [1, 3–9]. ular interest are Laboulbeniales that infect Coccinellidae Although H. virescens may occur on these species, it may (Coleoptera). Four species of Hesperomyces (H. chilomenis, not occur on some other coccinellid species found within the H. coccinelloides, H. hyperaspidis,andH. virescens) attack same habitat at the same time. For example, Harwood et al. entomophagous Coccinellidae [1, 3, 4]. Of these species, H. [8] sampled lady beetles using Malaise traps and recorded virescens Thaxter infects more coccinellid species than the H. virescens from B. quadripunctata, C. munda, H. axyridis, other three species [4]. Negative impacts of parasitism by and P. vigintimaculata. The fungus was not on Coleomegilla H. virescens on lady beetle populations are not well defined, maculata (De Geer) or Hyperaspis signata (Olivier) in but Kamburov et al. [5] found that infected Chilocorus those samples. Riddick and Cottrell [10]foundH. virescens bipustulatus L. adults suffered premature mortality. infecting H. axyridis, H. convergens,andO. v-nigrum when 2 Psyche beetles were collected using sweep nets. At the same time, determine sex of beetles in order to reduce handling and H. virescens was not on C. septempunctata, C. maculata, potential spore dispersal prior to experimentation. C. munda, Scymnus loewii Mulsant, or S. socer LeConte. Harwood et al. [8] and Riddick and Cottrell [10]reported 2.3. Transmission Studies that the exotic H. axyridis had the highest percentage of infected individuals (82.3 and 50.1%, resp.) among the 2.3.1. Seven-Day Exposure Experiment. We conducted this species sampled. Additionally Riddick and Cottrell [10] experiment using two separate trials, one in January and reported that H. virescens infected 33.1% of O. v-nigrum another in April 2010. For each trial, source H. axyridis adults but only 4.7% of other species of adult lady beetles. and O. v-nigrum were tested separately against laboratory Horizontal transmission between adult Coccinellidae is reared, target H. axyridis, O. v-nigrum,andC. maculata. via direct contact, usually during copulation but also within Before trials began, source beetles were observed using overwintering aggregations [11–15]. Indirect transmission a stereomicroscope, mature thalli were counted and each of Laboulbeniales, that is, beetles infected from ascospores beetle was designated with high (≥24), moderate (14 to 23), discharged onto a substrate is not likely [2]. or low (≤13) thalli density (range = 35). In both trials, we Our goal was to use laboratory assays to test the placed a source beetle (i.e., H. axyridis or O. v-nigrum)ina9 hypothesis that bodily contact between different species of cm diameter Petri dish with a target beetle (i.e., H. axyridis, lady beetles provides an avenue for horizontal transmission O. v-nigrum,orC. maculata). Each trial consisted of three of H. virescens. We paired infected beetles (i.e., source replicates of all possible source-target species combinations beetles) with noninfected beetles (i.e., target beetles) for at a 1 : 1 ratio of source : target. Thus, we used five target varying times to determine whether transmission, within beetles of one species per source species in each replicate for a or between species, occurred. Additionally, we examined total of 15 targets per trial and 30 targets for the experiment. whether transmission within species occurred via indirect In the first trial, O. v-nigrum source beetles with similar transmission under laboratory conditions. thalli densities were lacking; therefore, not all five target beetles of each species (i.e., H. axyridis, O. v-nigrum, and C. maculata)werematchedwithO. v-nigrum source 2. Materials and Methods beetles harboring similar densities of thalli. However, similar treatments between target species within each replicate were 2.1. Insects. We used adult beetles from laboratory colonies achieved by using three targets each paired with a low thalli or field collections in experiments. We established labo- density source O. v-nigrum, a fourth target paired with a ratory colonies of H. axyridis, C. maculata,andO. v- moderate thalli density source beetle and a fifth target paired nigrum from individual beetles collected at the USDA, with a high thalli density source beetle. Additionally during ARS, Southeastern Fruit and Tree Nut Research Laboratory, the first trial, all H. axyridis source beetles had low thalli Byron, GA, USA. Colonies were maintained on a diet densities thus two source beetles were placed with each of pecan aphids (Hemiptera: Aphididae), frozen Ephestia target beetle (ratio of source : target = 2 : 1) to insure that an kuehniella Zeller (Lepidoptera: Pyralidae) eggs, and a meat- outcome showing a lack of transmission was not solely due based diet (Beneficial Insectary, Redding, CA, USA) similarly to low thalli density of a single source beetle. as described by Cottrell [16]. Adult H. convergens and C. In the second trial, thalli density varied on both source septempunctata were field-collected and maintained on a species but source and targets were paired such that each similar diet for 2-3 wk before use in experiments. Holding of the five targets in each replicate was exposed to source field-collected beetles in the laboratory before using them in beetles with similar thalli density. In both trials, Petri dishes assays permitted time to detect any infected individuals. containing source and target beetles were housed in an environmental chamber (25 ± 1◦C and 14 : 10 [L : D]h) 2.2. Ectoparasitic Fungus. We initiated separate colonies of H. for seven days and provided food and water. After seven virescens-infected H. axyridis and O. v-nigrum by collecting days, we removed source beetle(s) but kept the target infected beetles from the field, confirming infection on beetle in that same Petri dish for one month. During this beetles using a stereomicroscope, and maintaining beetles time, we examined target beetles three times per week in the laboratory. We housed groups of infected beetles under a stereomicroscope for development of mature (or in containers (19 × 13.5 × 9cm)andprovidedfoodand at least nearly mature and identifiable) H. virescens thalli. water as previously described. We perpetuated each of the We documented any target beetles containing at least one infected colonies by the periodic addition of noninfected, mature thallus and placed them into 70% ethanol for later laboratory-reared adult H. axyridis or O. v-nigrum. These
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