Spatial distribution of the phytonematode community in Egyptian citrus groves

Summary - Taylor's power law was fit (P ~ 0.01) to population data of Tylenchulus semipenelrans, HelicOlylenchuspseudorobusluS and Criconemellaspp. obtained from stratified random sampling (seven cores/sample) and of T semipenelranscollected in systematic pattern (one core/sample) from citrus trees in the Northern and Southern Tahrir Province, Egypt. Differences between each of a and b values for the regression lines of these nematodes were statistically investigated. Sampie size optimization needed to achieve a predetermined level of sampling error for the nematodes was calculated. Data transformation of X' for T semipenelrans, la (I - X-In) for H. pseudorobuSlllS and la (I - X- 00'1) for Criconemella spp. were calculated from parameters of Taylor's power law fit to the survey data.