. 6 361 378 Sutton, B.C. 1992 The genus Glomerella and its anamorph Colletotrichum 1 26 Bailey J.A. Jeger M.J. Colletotrichum : biology, pathology and control CAB International
E. Barclay Poling
-section of the major strawberry-production regions in the United States and Canada), and a researcher from Israel, Dr. Stanley Freeman, Department of Plant Pathology, ARO, The Volcani Center, who is internationally recognized for his expertise of the fungus
H.J. Cho, B.S. Kim, and H.S. Hwang
Of 467 accessions of Capsicum pepper (Capsicum annuum L.) tested for resistance to gray leaf spot, KC321, KC220, KC208, KC47 (PI244670), KC43 (PI244670), KC380, and KC319 were highly resistant to both Stemphylium solani and S. lycopersici, the causal agents of gray leaf spot.
Allan B. Woolf, Asya Wexler, Dov Prusky, Elana Kobiler, and Susan Lurie
Effect of direct sunlight on the postharvest behavior of five avocado (Persea americana Mill.) cultivars (Ettinger, Fuerte, Hass, Horshim and Pinkerton) was examined. Probes placed 6 to 7 mm under the peel showed that the temperature an the side exposed to the sun could be as much as 15 to 20 °C higher than the temperature of shade fruit, while the nonexposed side of the fruit was ≈5 °C higher than the shade fruit. With the exception of `Ettinger', sun fruit, and especially the exposed side, were found to be most tolerant to postharvest 50 and 55 °C hot water treatments. Similarly, storage of fruit at 0 °C for between 3 to 6 weeks caused severe chilling injury to shade fruit, with less effect on sun fruit. Furthermore, there was little or no damage on the exposed side of the sun fruit. During postharvest ripening at 20 °C, sun fruit showed a delay of between 2 to 5 days in their ethylene peak compared with shade fruit. The exposed side of the sun fruit was generally firmer than the nonexposed side, and the average firmness was higher than that of shade fruit. Activities of polygalacturonase and cellulase were similar in shade and sun fruit of similar firmness. After inoculation with Colletotrichum gloeosporioides (Penz.) Penz@sacc., the appearance of lesions on sun fruit occurred 2 to 3 days after shade fruit. Levels of heat-shock proteins were examined using western blotting with antibodies for Class I and II cytoplasmic heat-shock proteins. Class I reacted with proteins from the exposed side of sun fruit and Class II with proteins from both sides of sun fruit. Thus, it is clear that preharvest exposure of fruit to the sun can result in a wide range of postharvest responses.
Sergio J. Carballo, Sylvia M. Blankenship, Douglas C. Sanders, David F. Ritchie, and Michael D. Boyette
Commercial packing lines in Sampson County, N.C., were surveyed during two growing seasons to study handling methods on susceptibility of bell pepper fruits (Capsicum annuum L.) to bacterial soft rot (Erwinia carotovora subsp. carotovora). Samples were taken from two field packers and one packing house in 1991 and from two field packers and four packing houses in 1992. One field packer and one packing house were common to both years. Fruits were either inoculated with bacteria or untreated and stored at 10 or 21C. Damaged fruits were counted and classified as crushed, cut, bruised, abraded, and other injuries. Fruit injury was less dependent on whether the operation was a packing house or a field packing line than on the overall handling practices of the individual grower. In general, packing peppers in packing houses resulted in an increased number of bruises, whereas fruit from field packing lines had more abrasions. More open skin injuries resulted in greater fruit decay. In both years, fruits stored at 10C had less top rot than fruits stored at 21C. In 1992, they also had less pod rot. Dry and chlorinated lines often had equivalent rot problems.
Thomas R. Gordon, Dorothy Okamoto, Andrew J. Storer, and David L. Wood
Pitch canker, caused by Fusarium subglutinans f. sp. pini, causes branch dieback and stem cankers in many species of pine. Monterey pine (Pinus radiata D. Don), one of the most widely planted pines in the world, is extremely susceptible to pitch canker. Four other pine species, which might serve as alternatives to Monterey pine in landscape settings, were found to be relatively resistant, based on the size of lesions resulting from branch inoculations under greenhouse conditions. Of these species, Japanese black pine (P. thunbergiana Franco) was the most resistant, followed by Canary Island pine (P. canariensis Sweet ex K. Spreng), Italian stone pine (P. pinea L.), and Aleppo pine (P. halepensis Mill.). Consistent with these findings, a field survey conducted in Alameda County, Calif., revealed Monterey pine to have the highest incidence of infection, with significantly lower levels in Aleppo, Canary Island, and Italian stone pines. Japanese black pine was not observed in the survey area.
Marci Spaw, Kimberly A. Williams, Laurie Hodges, Ellen T. Paparozzi, and Ingrid L. Mallberg
diagnostic tools. These tools include contacting extension specialists in horticulture, entomology, and plant pathology; nutrient analyses; and pathology tests. The “time and money budget form” (TMBF), which was refined in 2006 ( Fig. 1 ), is designed to help
Matthew R. Chappell, Sarah A. White, Amy F. Fulcher, Anthony V. LeBude, Gary W. Knox, and Jean-Jacques B. Dubois
pathology section was the next most valued section based on frequency of access (median = 3) and utility of information (median = 7). Information within the weeds section was accessed less frequently [median = 2 (i.e., sometimes)], but the information was
S. Snapp, W. Kirk, B. Román-Avilés, and J. Kelly
1 Dept. of Horticulture. 2 Dept. of Plant Pathology. 3 Dept. of Crop and Soil Sciences.
Bao-Zhong Yuan, Zhi-Long Bie, and Jie Sun
articles (16.60%), followed by HortScience (265; 13.05%), Journal of the American Society for Horticultural Science ( Proceedings of the American Society for Horticultural Science ; 257; 12.66%), European Journal of Plant Pathology (195; 9.61%), and