- Late blight is a fungus. Fungi like warm (but not too hot), moist, and preferably dark conditions. The Met Office reckon 2012 saw a mild Winter followed by a Summer that was hot yet cooler than average, cloudier than average, and with unprecedented rainfall keeping it very moist. In that weather it's amazing that stones didn't catch infections, never mind the tatties.
- Agribusiness don't grow the healthiest crops to begin with. They grow monocultures which drain the soil of nutrition whilst providing the perfect environment for disease to flourish. Combine that with the Summer we've had and it's no wonder the spuds are going nasty.
- Farms are out in the countryside, surrounded by other farms. Allotments are in the cities, surrounded by houses. There are a lot of miles to cover between a city allotment and a country farm. How on Earth is a disease of potatoes - a famously sedentary species - communicated between urban tubers and their rural counterparts?
Still, the comments aren't a surprise. Industry supports industry, after all, and the prime culprit - the weather - is the fault of climate change; a byproduct of the manufacturing, petrochemical and automotive industries. For agribusiness to call these industries out for knackering the 'tater harvest would readily lead to a case of legal Mutually Assured Destruction, from which only lawyers and journos would profit.
Take good care of your potatoes, burn any that show signs of blight, but don't stop growing just because the weather's bad for business! When agribusiness feels the need to distort the truth and ignore the science just to attack the home gardener and the allotment keeper then it becomes apparent that the edaphic revolution has gained more ground than industry is comfortable with.