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R.O.M. Mwanga, A. Kriegner, J.C. Cervantes-Flores, D.P. Zhang, J.W. Moyer, and G.C. Yencho

SPFMV and SPCSV inoculum and technical advice for virus resistance evaluation at CIP. We also thank Doris Carbajulca and Geneveva Rossell for helping with the AFLP analysis.

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Mario Orozco-Santos, Octavio Perez-Zamora, and Oscar Lopez-Arriaga

The effect of floating rowcover and transparent polyethylene mulch was evaluated on insect populations, virus disease control, yield, and growth of muskmelon (Cucumis melo L.) cv. Durango in a tropical region of Colima state, Mexico. Aphids (Aphis gossypii Glover and other species), sweetpotato whitefly (Bemisia tabaci Gennadius), beetles (Diabrotica spp.), and leafminer (Lyriormyza sativae Blanchard) were completely excluded by the floating rowcover while the plots were covered (until perfect flowering). Transparent mulch reduced aphids and whitefly populations, but did not show effect on leafminer infestation. The appearance of virus diseases of plants was delayed for 2 weeks by floating rowcover with respect to control (bare soil). Also, the transparent mulch reduced the virus incidence. The yield and number of fruit were positively influenced by floating rowcover and transparent mulch. Plot with transparent mulch combined with floating rowcover yielded nearly 4-fold higher (50.9 t·ha–1) than that plots with bare soil (13.1 t·ha–1). The yield from plots with floating row cover on bare soil was of 38.3 t·ha–1, while in the transparent mulch plots it was of 23.1 t·ha–1. The results of this work shows the beneficial effects of floating rowcover and transparent mulch in dry tropical conditions.

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Benard Yada, Phinehas Tukamuhabwa, Arthur Villordon, Agnes Alajo, and Robert O.M. Mwanga

). Genetic erosion threatens this diversity as a result of sweetpotato virus disease (SPVD) caused by dual infection of Sweetpotato feathery mottle virus ( Potyvirus; Potyviridae ) and Sweetpotato chlorotic stunt virus ( Crinivirus; Closteroviridae

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Keith O. Fuglie

the viruses of most economic importance include sweetpotato chlorotic stunt virus (SPCSV) that together with the ubiquitous sweetpotato feathery mottle virus (SPFMV) cause the most devastating disease, especially in sub-Saharan Africa and Latin America

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James D. McCreight and Albert N. Kishaba

greenhouse and field tests, H.Y. Liu for the squash leaf curl virus isolate and assistance in ELISA tests, B.E. Mackey for statistical assistance, and H.M. Munger and T.W. Whitaker for helpful suggestions. The cost of publishing this paper was defrayed in

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Guo-qing Song, Hideo Honda, and Ken-ichi Yamaguchi

constitutive promoters when transgenes, including most of those conferring resistances to herbicides, insects, and diseases, are targeted principally in green tissues of sweetpotato. This is because leaf-specific instead of constitutive expression of target

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Rukundo Placide, Hussein Shimelis, Mark Laing, and Daphrose Gahakwa

sweetpotato research in developing countries: Results of a survey HortScience 42 1200 1206 Gibson, R.W. Aritua, V. Byamukama, E. Mpembe, I. Kayongo, J. 2004 Control strategies for sweetpotato virus disease in Africa Virus Res. 100 115 122 Gibson, R

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Susan C. Miyasaka, Sharon Motomura-Wages, Ishakh Pulakkatu-Thodi, Michael J. Melzer, Christopher A. Clark, Don R. LaBonte, and Arthur Q. Villordon

.J. Fuentes, S. Kreuze, J.F. Gibson, R.W. Mukasa, S.B. Tugume, A.K. Tairo, F.D. Valknen, J.P.T. 2012 Sweetpotato viruses: 15 Years of progress on understanding and managing complex diseases Plant Dis. 96 168 185 Clark, C.A. Ferrin, D.M. Smith, T.P. Holmes, G

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Robert O.M. Mwanga, Benson Odongo, Charles Niringiye, Agnes Alajo, Putri E. Abidin, Regina Kapinga, Silver Tumwegamire, Berga Lemaga, James Nsumba, and Edward E. Carey

children and women. The cultivars have low to moderate levels of field resistance to sweetpotato virus disease (SPVD) and Alternaria blight ( Tables 2 and 3 ) and high storage root yields compared with the average national root yield of 4 t·ha −1

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Robert O.M. Mwanga, Benson Odongo, Charles Niringiye, Agnes Alajo, Benjamin Kigozi, Rose Makumbi, Esther Lugwana, Joweria Namukula, Isaac Mpembe, Regina Kapinga, Berga Lemaga, James Nsumba, Silver Tumwegamire, and Craig G. Yencho

field resistance to sweetpotato virus disease (SPVD) and Alternaria bataticola blight and high storage root yields compared with the average national storage root yield of 4.0 t·ha −1 ( International Potato Center, 1999 ). The release of these five