Volume 46 - December 2014 : Hawaiian Entomological Society

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    Front material, PHES volume 46; 2013 minutes; membership list
    (Hawaiian Entomological Society, 2014-12) Matsunaga, Janis
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    Evidence of an Undescribed, Extinct Philodoria Species (Lepidoptera: Gracillariidae) from Hawaiian Hesperomannia Herbarium Specimens
    (Hawaiian Entomological Society, 2014-12) Johns, Chris A. ; Tangalin, Natalia ; Bustamente, Keahi ; Kawahara, Akito Y.
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    Trapping Sweetpotato Weevil, Cylas formicarius (Coleoptera: Brentidae), with High Doses of Sex Pheromone: Catch Enhancement and Weathering Rate in Hawaii
    (Hawaiian Entomological Society, 2014-12) McQuate, Grant T. ; Sylva, Charmaine D.
    Sweetpotato, Ipomoea batatas (L.) Lamarck, one of the top ten staple crops produced worldwide, has increased in production in Hawaii in recent years. The sweetpotato weevil, Cylas formicarius (Summers) (Coleoptera: Brentidae), is a major economic and quarantine pest of sweetpotato in Hawaii as well as a pest of concern in all parts of the tropics where sweetpotatoes are grown. Sweetpotato weevil infestation can reduce marketable root yield as well as reduce root quality by inducing production of bitter tasting sesquiterpines by the sweetpotato tissue. Traps baited with a male sweetpotato weevil lure, (Z)-3-dodecenyl (E)-2-butenoate, can be used for population monitoring, or even for population suppression if mass trapping is done using high doses of this lure. Weathering rates, though, have not been documented in Hawaii for the higher septa loadings (100 to 1000 μg [=1.0 mg]) that have been proposed for use in population suppression efforts through mass trapping. Here, we present comparative catch rates and weathering rates, along the Hamakua Coast of Hawaii island, of traps baited with septa loaded with 12 μg, 120 μg, or 1.0 mg of male sweetpotato weevil lure. Traps baited with fresh 1.0 mg male lure caught over 22 times as many weevils as traps baited with 12 μg lure over an initial one-week trapping period. Based on a fitted decay curve, decline in attractiveness of the 1.0 mg treatment to 50% of fresh attractiveness occurred at 19.0 weeks, while the 120 μg treatment showed a 50% decline after 16.3 weeks, under climate conditions on the Hamakua Coast of Hawaii island. Further research is needed to test the effectiveness of mass trapping in reducing root damage by sweetpotato weevil, through the use of a high dose male lure in combination with the recently reported enhancement of trap catch by adding a green light source.
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    Attractiveness of Gel, Granular, Paste, and Solid Formulations of Ant Bait Insecticides to the Little Fire Ant, Wasmannia auropunctata (Roger) (Hymenoptera: Formicidae)
    (Hawaiian Entomological Society, 2014-12) Hara, Arnold H. ; Aoki, Kris L. ; Cabral, Susan K. ; Niino-DuPonte, Ruth
    The little fire ant, Wasmannia auropunctata (Roger) (Hymenoptera: Formicidae), was first detected in plant nurseries in the Puna district of Hawaii island in 1999. W. auropunctata has since spread throughout Hawaii island, and is reported in homes, landscapes, plant nurseries and orchards, and forested areas. This study evaluated: 1) the attractiveness of several granular, liquid, gel, and paste insecticidal ant baits for homeowner and commercial use as compared with the standard granular baits containing hydramethylnon known to be attractive to and effective against W. auropunctata, and 2) the effects of weathering on granular bait attractiveness. Field attractiveness choice tests were conducted in an infested 37.2-m2 plot, and worker ant foraging and recruitment were recorded at 15-min intervals for 2 h. Granular and paste products that were as attractive as standard granular baits (Amdro Fire Ant Bait, Probait) included others formulated with hydramethylnon, abamectin, hydramethylnon and S-methoprene, indoxacarb, fipronil, and metaflumizone. None of the gel or liquid ant bait products evaluated (active ingredients hydramethylnon, sodium tetraborate pentahydrate, thiameth- oxam, fipronil or indoxacarb) were attractive to foraging workers. Attraction of these baits could possibly be improved with inclusion of preferred food sources, such as peanut butter or animal-based protein. Attractiveness of granular ant baits exposed to 7 and 14 days of weathering fell by 40 to 96% as compared to fresh deposits. Corn grit baits should be formulated to preserve attractiveness in tropical environments with high rainfall.
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    First Records of Parasitoids Attacking the Asian Citrus Psyllid, Diaphorina citri Kuwayama (Hemiptera: Liviidae), in Hawaii
    (Hawaiian Entomological Society, 2014-12) Matsunaga, Janis N.
    amarixia sp. prob. radiata (Hymenoptera: Eulophidae) and Diaphoren- cyrtus aligharensis (Hymenoptera: Encyrtidae), two natural enemies released against the Asian citrus psyllid (Diaphorina citri) in various areas around the world, were discovered attacking this pest on the island of Oahu, Hawaii, in 2012.
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    Additions to the Fruit Fly Fauna (Diptera: Tephritidae: Dacinae) of Bangladesh, with a Key to the Species
    (Hawaiian Entomological Society, 2014-12) Leblanc, Luc ; Hossain, M. Aftab ; Khan, Shakil Ahmed ; San Jose, Michael ; Rubinoff, Daniel
    Five species of Bactrocera are reported to occur in Bangladesh for the first time. The species previously recorded as B. nigrofemoralis is actually B. nigrifacia. An illustrated key to the nineteen species known to occur in the country, plus B. nigrofemoralis, is provided.
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    Two Records of Intestinal Myiasis Caused by Ornidia obesa and Hermetia illucens in Hawaii
    (Hawaiian Entomological Society, 2014-12) Yang, Pingjun
    Intestinal myiasis caused by Ornidia obesa and Hermetia illucens is not common, especially for O. obesa. This is the first report of of intestinal myiasis caused by these two species in Hawaii.
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    Effect of the Guppy, Poecilia reticulata, on Oviposition of Culex quinquefasciatus (Diptera: Culicidae)
    (Hawaiian Entomological Society, 2014-12) Yang, Pingjun
    Many mosquito species avoid oviposition sites infested with predators of their progeny. We investigated whether the guppy Poecilia reticulata Peters affected the oviposition site selection of natural blood-fed gravid Culex qinque- fasciatus Say females in both the laboratory and field. In the laboratory, there was no significant difference between the average numbers of egg rafts laid by Cx. qinquefasciatus females on water with fish and without fish. In the field, there was no significant difference between the average numbers per night of gravid Cx. qinquefasciatus females collected from gravid traps with fish and without fish. Our investigation shows that natural blood-fed gravid Cx. quinquefasciatus does not avoid oviposition sites with P. reticulata. The phenomenon of absence or very low number of mosquito larvae in some water habitats in the presence of P. reticulata is discussed.
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    Abundance and Seasonal Occurrence of Pest Fruit Flies (Diptera: Tephritidae) in Residential and Rural Areas of Oahu (Hawaiian Islands)
    (Hawaiian Entomological Society, 2014-12) Leblanc, Luc ; Graham, Steven ; Mcneil, Steve ; Pohlman, Kurt ; Dinneen, Michael ; Fujita, Brian
    A trapping network is maintained on Oahu (Hawaiian Islands) for early detection of invading fruit flies. The 359 sites are concentrated around the main ports of entry in the south, the community gardens throughout the island, and the commercial farming areas in Waialua and northeast Oahu. Data on abun- dance and seasonal fluctuation cycles, based on five years (2009-2013) of male lure and protein trapping data, are presented for three species of pest fruit flies, Bactrocera cucurbitae (Coquillett), B. dorsalis (Hendel) and Ceratitis capitata (Wiedemann). Over 87,000 samples yielded 8.5 million flies of the four established species (54.9% B. dorsalis, 43.7% B. cucurbitae, 1.4% C. capitata, plus a few B. latifrons (Hendel)). No new invading species were collected. Trap captures for all three species were highest during summer months each year, with secondary peaks for B. cucurbitae later in the year in rural areas of southern Oahu, related to cucurbit host commercial production. At one site, with coffee in cultivation, C. capitata peaked between October and December. Seasonal cycles of B. dorsalis and C. capitata in residential areas appeared to be determined by the fruiting of ornamental trees and shrubs, including mango, rather than guava for B. dorsalis or coffee for C. capitata. The high correlation between captures of males in male lure traps and females in protein traps for the three species suggests that both attractants can be used to monitor seasonal abundance.
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    Nomenclatural and Taxonomic Notes on Names of Hawaiian Coccinellidae (Coleoptera)
    (Hawaiian Entomological Society, 2014) Leeper, John R.
    Hawaii has a long and successful history of coccinellid introductions for biological control of pest insects and powdery mildew. This paper discusses the names of five established species (Chilocorus nigrita (Fabricius), Hippodamia quinquesignata ambigua LeConte, Psyllobora vigintimaculata (Say), Sasajis- cymnus anomalus (Chapin), and Scymnus ambulans Blackburn), giving spelling corrections, changed generic combinations, and one new combination (Sasajis- cymnus anomalus (Chapin), n. comb.) to allow accurate usage of these names in the Hawaiian literature. Justification is also provided for the use of Hyperaspis pantherina Fursch which, until Nishida (2002), appeared in Hawaiian literature as Hyperaspis jocosa (Mulsant).