Bordeaux Mixture may help to prevent blight from spreading but it won't get rid of blight that's already there. I have a feeling it's another of those things that's due to be phased out but there may still be some in garden centres etc.
carrying this thread along; im not sure whether my spuds have very early blight or not!
some leaves at the bottom of some plants have yellow leaves. no rain for 3 weeks, I wondered if it was vitamin defficency so used Epson salts , watering and avoiding the leaves.
this morning a couple of leaves had a bit of brown on them!!
if it spreads, if it is blight, they've been in since 30th march, charlottle and duke of York.
my question is:
is it best to cut of the leaves?
dig the spuds up? or leave in the ground?!
I have had blight a couple of years back in the lovely 2012 rainfest that was our summer.havent grown them since.hum...
Claire, your description sounds very like my potatoes. You're supposed to remove the blighted leaves and destroy them. I do find that with Charlotte, the potatoes themselves are unaffected even when the whole top.has died off, and they will stay fresh in the ground until you want them, although they won't grow any bigger.
But some other varieties of potato tuber seem to succumb to the blight, so maybe lift and store them, or eat them first?
ooh thanks guys!
im going to have a look now I could hardly wait !
been gardening for years, but its still exciting!
duke of York ready and very good.
charlotte not quite, very small.but they're in bags
Decided to spray my potatoes with bordeaux mixture this morning as rain is forecast for the end of the week and all next week, they had a spray at the beginning of the month too. I noticed what looks like blight on my first early pentland but none on the second early Charlotte and nadine or maincrop desiree. There hasn't been any rain for a week or so but we had a full criteria on the 14th and a near miss on 18th and 19th. I removed the affected leaves but will check again tomorrow and will consider cutting the haulms off the first earlies after digging a sample as I reckon that they can't be too far off the harvest time anyhow, this I want to get done before the rain comes to prevent the spores from spreading to the tubers or the unaffected plants.
I've not seen any more possible blight since I took the dodgy leaves off. I've ordered a small amount of bordeaux mixture off ebay.
The potatoes are incredibly thirsty at the moment, demanding several litres each day. I've been even more careful with my watering to ensure none ends up on the leaves at all. Hopefully It'll be ok.
Well I didn't take any chances I'm not sure that it was signs of blight but after digging some potatoes they looked about ready to lift so I cut all the haulms down and binned them then lifted the two rows of pentland javelin in total 30lbs, fingers crossed that the second early and maincrop stay blight free.
30lb isn't bad, is it.
I gave them another, closer, inspection today and noticed another leaf with the blemishes, and a slight discolourization of some of the stems (circled in the pic):
I'm pretty sure it's early blight now - the only other open possibility I can think of is a magnesium deficiency as one or two of the older leaves have some yellowing as well; I plan to water in a little epsom salt tomorrow morning and we'll see, but I'm only clinging onto hope really.
From what I've read on the net it seems the biggest risk with early blight is to yeilds if the plant's foliage becomes compromized, which is more likely if the plant gets wet too much. If that's correct then I'll continue trying to minimize the damage by keeping care of the plants as best I can. Despite having to cut a few leaves off so far, the rest of the plant looks pretty healthy, and although the plants are fully mature it seems to be putting out a few new leaves to compensate for those I chopped off.How likley are the tubers to be infected? At what point do I dispose of the plant and dig them up? I reckon they've be in there for 2-3 months, and have grown vigourously. I'm retisent to put my hand under the soil and see what the tubers are like in case I infect them. They're in containers so I can't go in from the side.
Overall, I'd say they still look healthy plants at the moment: