An Application of Space-Time Analysis to Improve the Epidemiological Understanding of the Papaya-Papaya Yellow Crinkle Pathosystem

Fig. 4. Results for a spatial point pattern for (A) sweet potato little leaf V4 (SPLL-V4) and (B) tomato big bud-infected (TBB) papaya plants.  The hypothesis of complete spatial randomness was tested using K and L functions based on Ripley (19) and Diggle (6).  The black line indicates the L-value at each distance examined from a SPLL-V4 and TBB-infected papaya, while the different dotted lines indicated the 2.5, 5, 95, and 97.5% quantile envelopes obtained from n = 999 simulations of SPLL-V4 and TBB-infected papaya.  From this analysis, it appears that SPLL-V4 has an aggregated distribution of infected papaya, while there is not strong evidence to suggest that TBB-infected papaya are aggregated.



Image from Plant Health Progress article:
An Application of Space-Time Analysis to Improve the Epidemiological Understanding of the Papaya-Papaya Yellow Crinkle Pathosystem