Just an odd thought but I've been noticing a trend with the last batch of plants I've done up. I tend to plant in two 5x5 grids and I will have a section of the grid be affected by one particular ailment. All bugs or all disease. I was wondering does having an inflicted plant in proximity to another increase the chances of another plant 'catching' the problem. I mean thats how it works in real life, I just never heard if the game mechanics do a similar thing. thanks.