of soil properties and crop characteristics and any possible changes of those spatial patterns over time.
Cranberry (Vaccinium macrocarpon Ait.) is an intensively man-Preliminary studies of the spatial variability in cranaged perennial crop. Patches of disease, local variation in soil properberry yield indicate that factors influencing variability ties, and regional changes in soil type and hydrology cause its yield differ with scale. At the small scale, those factors are to vary spatially at several scales. We evaluated the spatial variability of cranberry yield with two support sizes and covering three scales:likely to be soil-born fungal diseases, such as Fairy Ring (i) 500 contiguous 0.09-m 2 samples covering a 6 by 7.5 m area (small and Phytophthora Root Rot (PRR). Several causal scale, SS), (ii) an average number of 100 variably spaced 0.09-m 2 pathogens have been described in the literature as resamples from each of 21 fields (medium scale, MS), and (iii) 534 fields lated to Fairy Ring, including basidiomycetous fungus (16 830 m 2 average area) each characterized with a single value of Psilocybe agrariella as well as Phialophora and Rhizoctotal yield (large scale, LS). Differences in yield calculated from points tonia spp. (Caruso and Ramsdell, 1995; Zuckerman et separated by incremental distances h were raised to power values q al. , 1968; Chang, 1989). Phytophthora cinnamomi Rands (from 0 to 4 in steps of 0.1). The q ϭ 2 data were fitted to either is a primarily causal agent of PRR in New Jersey (Caspherical (SS and LS) or exponential (MS) semivariogram models. ruso and Ramsdell, 1995). Fairy Ring expands outward The logarithm of average differences plotted vs. log h were characterfrom the point of infection in all directions at a rate of ized by their slope, (q ). Structure functions [(q ) vs. q] were fitted with the universal multifractal model containing three parameters (C, L. Pozdnyakova and P.V. Oudemans, P.E. Marucci Center for Blue/ Cranberry Res. and Ext., Rutgers Univ., 125A Lake Oswego Rd., as wheat (Triticum aestivum L.), corn (Zea mays L.), Chatsworth, NJ 08019-2006; and D. Gimé nez, Dep. of Environ. Sciand soybean [Glycine max (L.) Merr.] (Brownie et al., ences, Rutgers Univ.,
