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Claudio C. Pasian, Daniel K. Struve and Richard K. Lindquist

The effectiveness of two application methods of the insecticide imidacloprid in controlling 1) melon aphids (Aphis gossypii Glover) on `Nob Hill' chrysanthemum (Dendranthema ×grandiflora Ramat) plants and 2) silverleaf whitefly (Bemisia argentifolii Bellows & Perring) on `Freedom Red' poinsettia (Euphorbia pulcherrima Wild.) were compared. Plants were grown in containers with their interior covered by a mixture of flat latex paint plus several concentrations of imidacloprid (0, 10, 21, 42, and 88 mg·L−1), or treated with a granular application of the insecticide (1% a.i.) according to label recommendations. All imidacloprid treatments effectively reduced aphid survival for at least 8 weeks. The two most effective treatments were the granular application (10 mg a.i.) and the 88-mg·L−1 treatment (0.26 mg a.i). All imidacloprid treatments effectively reduced whitefly nymph survival. The 42- and 88-mg·L−1 treatment and the granular application (1% a.i.) were equally effective in reducing nymph numbers in lower poinsettia leaves. None of the plants given treatments with paint exhibited any phytotoxicity symptoms. These results suggest the possibility of a new application method for systemic chemicals with the potential of reducing the release of chemicals to the environment. Paint and imidacloprid mixes are not described in any product label and cannot be legally used by growers. Chemical name used: 1-[(6-chloro-3-pyrimidil)-N-nitro-2-imidazolidinimine (imidacloprid)

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Huangjun Lu, Alan L. Wright and David Sui

Florida facilitates lettuce production from fall through spring, but the warm and moist conditions are also favorable for insect proliferation and damage. Banded cucumber beetle, serpentine leafminer, and aphids are among the major pests causing

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James D. Frantz, Jeffrey Gardner, Michael P. Hoffmann and Molly M. Jahn

1 To whom reprint requests should be addressed; e-mail mmj9@cornell.edu . We would like to thank the Asian Vegetable Research and Development Center for cotton aphid resistant germplasm. This study was funded in

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Albert N. Kishaba, Steven J. Castle, Donald L. Coudriet, James D. McCreight and G. Weston Bohn

Abbreviations: ANOVA, analysis of variance; AR HBJ, AR Hale's Best Jumbo; AR TM, AR Topmark; AR 45, aphid-resistant `PMR 45'; CMV, cucumber mosaic virus; HBJ, `Hale's Best Jumbo'; EN 50 , 50% infection; WMV, watermelon mosaic virus; ZYMV, zucchini

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Michael Dossett and Chaim Kempler

Interest in breeding raspberries with resistance to the raspberry aphid Amphorophora agathonica dates back to the 1920s, when it was first identified as the primary vector for the raspberry mosaic virus complex in North America ( Rankin, 1927

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Ana Regia Alves de Araújo Hendges, Jose Wagner da Silva Melo, Marcelo de Almeida Guimaraes and Janiquelle da Silva Rabelo

, there are frequent infestations by the cabbage aphid [ Brevicoryne brassicae L. (Hemiptera: Aphididae)], green peach aphid [ M. persicae Sulzer (Hemiptera: Aphididae)], diamondback moth [ Plutella xylostella L. (Lepidoptera: Plutellidae)], kale

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Michael Dossett and Chad E. Finn

remove fields after only three to four seasons because of decreased profitability ( Halgren et al., 2007 ). Much of this decline has been associated with aphid-vectored viruses, particularly black raspberry necrosis virus [BRNV ( Halgren et al., 2007

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James D. McCreight

Lettuce aphid ( Nasonovia ribisnigri Mosley) has affected lettuce ( Lactuca sativa L.) production in Europe since the 1970s and became a serious problem on lettuce in British Columbia, Canada, in 1981 ( Forbes and MacKenzie, 1982 ). It was

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S. Alan Walters

, David Voegtlin of the Illinois Natural History Survey for aphid identification, and Houston Hobbs of the University of Illinois-Dept. of Crop Sciences for virus determination. The use of trade names in this publication does not imply endorsement of the

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James D. McCreight and Yong-Biao Liu

in salads or sandwiches in the United States, Europe, and Australia, but in some countries, elongated stems are eaten; raw in Egypt; and cooked in China ( Ryder, 2002 ). Lettuce aphid, Nasonovia ribisnigri Mosley (Hemiptera: Aphididae), is an