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Larry A. Rupp, Richard M. Anderson, James Klett, Stephen L. Love, Jerry Goodspeed, and JayDee Gunnell

have arisen in the interior western states to support the selection, production, evaluation, and marketing of native plants. Materials and methods Utah model . The Sego Supreme plant breeding and introduction program was initiated by Utah State

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Paul Lyrene

An Introduction to Plant Breeding . Jack Brown and Peter Caligari. 2008. Blackwell Publishing, 9600 Garsington Road, Oxford OX4 2DQ, UK. 209 p. $69.00, paperback. ISBN: 978-1-4051-3344-9. I really wanted to like this book. Well-written books

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W. Patrick Wechter, Amnon Levi, Kai-Shu Ling, Chandrasekar Kousik, and Charles C. Block

plates and grown for an additional 24 h for use in the described assays. Table 1. Acidovorax avenae subsp. citrulli isolates used for study. Plant material. Seeds of PIs were obtained from the USDA, ARS, North Central Regional Plant Introduction

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Chandrasekar S. Kousik, Amnon Levi, Kai-Shu Ling, and W. Patrick Wechter

of plant introductions (PI) of bottle gourd ( Lagenaria siceraria ) for resistance to powdery mildew caused by Podosphaera xanthii z . Fig. 1. Frequency of distribution of the original screening of 234 bottle gourd ( Lagenaria

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W. Patrick Wechter, Mark W. Farnham, J. Powell Smith, and Anthony P. Keinath

resistance that might be incorporated into improved cultivars of these species. Materials and Methods Plant materials. B. juncea and B. rapa accessions (Plant Introductions) were obtained from the USDA, ARS, North Central Regional Plant

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Joseph N. Wolukau, Xiao-Hui Zhou, Ying Li, Yong-Bin Zhang, and Jin-Feng Chen

in plant introduction 140471 to be near immunity. On the contrary, McGrath et al. (1993) contends no sufficient resistance to GSB is available in melon. Furthermore, resistance in plant introduction 140471 has recently been described as variable

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Zhang Zhiming

Due to the large area and the complex topography and climate. a great deal of wild ornamental plants are still hidden in the depth of forests and on the highland plateaus--places difficult to approach by man. In the Three N Regions only, there are 51 species of Rhododendron, 27 of Lilium, 83 of Rosa, 30 of Iris, 40 of Clematis, etc., yet to be explored and utilized. Aiming at this, we made extensive introduction of plants in general and intensive introduction of certain families and genera in particular, with good results. At present we have in our living collection 12 species of Clematis, 24 of Rosa, 13 of Lilium, 10 of Iris, 8 of Tulip, 6 of Aquilegia, 10 of Thalictrum, 20 of Gentiana, 80 of ferns, 40 of Begonia, 50 of the Araceae. Seed germination tests, micropropagation, breeding for new varieties and other experiments and researches have been carried out on many of these plant groups.

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Paul G. Thompson, John C. Schneider, Boyett Graves, and R. Crofton Sloan Jr.

One hundred U.S. sweetpotato [Ipomoea batatus (L.) Lam.] plant introductions (PIs) and four control cultivars were screened for insect injury in 1993. Of the least injured by insects, 56 and 31 were tested again in 1994 and 1995, respectively. Among control cultivars, the most highly resistant was `Regal' (moderately resistant), followed by `Beauregard' (susceptible), `Centennial' (susceptible), and `Jewel' (susceptible). Stem and root injury by the sweetpotato weevil (SPW) [Cylas formicarius elegantulus (Summers)] and root injury by the wireworm (Conoderus sp.)–Diabrotica sp. (cucumber beetle)– Systena sp. (flea beetle) (WDS) complex were measured. SPW stem injury was less severe (P ≤ 0.05) in 1994 and 1995 in PIs 508523, 531116, and 564107 than in control cultivars. PIs 508523 and 531116 also suffered less SPW root injury than did `Regal'. In the six PIs with least SPW root injury, PIs 538354, 564149, 508523, 538286, 531116, and 564103, 70% to 85% of the roots were not injured compared with 36% in `Regal' and 6% in `Jewel'. SPW root injury scores (0 = no injury; 5 = severe injury) in those PIs averaged 0.5 vs. 2.3 for `Regal'. Only in PI 538286 was WDS injury to roots less than in `Regal' over 2 years. However, eight additional accessions suffered less WDS injury than `Regal' in 1995 and four of those were among the six with least SPW injury. The lower levels of combined insect injury found in these four PIs (compared to `Regal') show that PIs have potential use for increasing insect resistance in sweetpotato improvement programs.

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Chandrasekar S. Kousik, Scott Adkins, William W. Turechek, and Pamela D. Roberts

in wild relatives of the cultivated watermelon. In this article, we present results of greenhouse and field evaluation of the watermelon core collection of U.S. plant introductions (PIs) for resistance to SqVYV. Parts of this study have been

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Paul G. Thompson, John C. Schneider, and Boyett Graves

One hundred plant introductions (PIs) were evaluated for sweetpotato-weevil resistance in experiment station field trials for 2 years in Beaumont, Miss. Weevil infestation was accomplished by applying adult weevils in year 1 and weevil infested roots in year 2. The percentage of uninjured roots ranged from 38% in `Centennial', the susceptible control, to 93% in PI538288. Severity of root and stem injury were measured in year 2. Stem injury ratings on a scale of 0, for no injury, to 4, for severe injury, ranged from 1.2 in PI564113 to 3.7 in `Beauregard'. Root injury ratings on a scale of 0 to 5 ranged from 0.1 in PI538288 to 4.2 in `Beauregard' (susceptible control). Thirty-five PIs had lower root injury values than `Regal' (resistant control), and the percentage of uninjured roots was higher in 45 PIs than in `Regal'. These results suggest that genes are available in PIs for increased levels of weevil resistance in sweetpotato.