As if we haven't been waiting all summer for tomatoes to finally ripen here in the soggy, cool Midwest, just as we begin to enjoy the fruit of our (ahem - Jan's) labor, a nasty problem has developed.
The latest trouble is the explosion of late blight, a plant disease that attacks potatoes and tomatoes. Late blight appears innocent enough at first — a few brown spots here, some lesions there — but it spreads fast. Although the fungus isn’t harmful to humans, it has devastating effects on tomatoes and potatoes grown outdoors. Plants that appear relatively healthy one day, with abundant fruit and vibrant stems, can turn toxic within a few days. (See the Irish potato famine, caused by a strain of the fungus.)
Most farmers in the Northeast, accustomed to variable conditions, have come to expect it in some form or another. Like a sunburn or a mosquito bite, you’ll probably be hit by late blight sooner or later, and while there are steps farmers can take to minimize its damage and even avoid it completely, the disease is almost always present, if not active.
But this year is turning out to be different — quite different, according to farmers and plant scientists. For one thing, the disease appeared much earlier than usual. Late blight usually comes, well, late in the growing season, as fungal spores spread from plant to plant. So its early arrival caught just about everyone off guard.
And then there’s the perniciousness of the 2009 blight. The pace of the disease (it covered the Northeast in just a few days) and its strength (topical copper sprays, a convenient organic preventive, have been much less effective than in past years) have shocked even hardened Hudson Valley farmers. [More]
Jan tells me her garden websites are full of blight news - and it's been detected in Indiana and Wisconsin. Even better it's related to the same fungus responsible for the Irish potato famine, so potato growers are being clobbered too.
2009 is going to be one for the books.