Irish Gardeners Forum Home
 FAQFAQ   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
Custom Search
   
Weather Report /
Moon Phase for Ireland

Post new topic   Reply to topic    Irish Gardeners Forum Home -> Vegetable growing, fruit and allotments in Ireland

Another potato blight question, if I may...


 
Most Recent Posts Huge storm takes out Sequoia
Last post: Sue Deacon
Indoor sowing.
Last post: Sue Deacon
At last! A garden joke. (except maybe it's not a joke!)
Last post: Ado 2
No Herbicide please
Last post: Greengage
 
Visit TheGardenShop.ie
Author Message
greengiant
Rank attained: Hawthorn Tree
Rank attained: Hawthorn Tree


Joined: 27 Mar 2009
Posts: 67
Location: Co. Kildare

PostPosted: Tue Jul 05, 2011 4:10 pm    Post subject: Another potato blight question, if I may... Reply with quote

Hi all,
Apologies if I'm just adding to to an exhausted topic, but even after looking over other photos on the forum, I still can't decide if my Maris Peer have blight or not. There is no white mould on the leaves' undersides - does this mean I'm in the clear? Also, many of the lower leaves have turned yellow. If it's of any help - it's been extremely windy in my area (Kildare), sunny and wet. See photos below. Advice asap will be gratefully received!



IMG_0832 copy.jpg
 Description:
 Filesize:  40.31 KB
 Viewed:  3446 Time(s)

IMG_0832 copy.jpg



IMG_0829 copy.jpg
 Description:
 Filesize:  51.1 KB
 Viewed:  3446 Time(s)

IMG_0829 copy.jpg



IMG_0834 copy.jpg
 Description:
 Filesize:  40.96 KB
 Viewed:  3446 Time(s)

IMG_0834 copy.jpg


Back to top
View user's profile Send private message
Lius
Rank attained: Silver Birch Tree
Rank attained: Silver Birch Tree


Joined: 12 Mar 2009
Posts: 191
Location: Ballinteer, Dublin

PostPosted: Thu Jul 07, 2011 8:14 am    Post subject: Reply with quote

Hi greengiant, are you the "Jolly......."?

I have had the exact same damage to the foliage of my first and second earlies and the second earlies did not even flower. I did not spray either crop and both had perfectly normal tubers; however the quantity and size of the tubers was down on last year, I suspected a low yield as the foliage did not grow very big this year. I am still harvesting second earlies with the same foliage damage which are fine, they are Orla (blight resistant) and I'm not going to spray.

Strangely though, my main crop Sarpo Mira (also blight resistant) shows no sign of this damage, in fact they look extremely healthy, with deep green leaves, and the bright flowers started to blossom this week. The foliage on these are small but it's early days yet and I'm hoping for a good harvest from the main crop.
Back to top
View user's profile Send private message
sirpsycho
Rank attained: Pedunculate oak tree


Joined: 15 Mar 2010
Posts: 341
Location: Stamullen, Co Meath

PostPosted: Thu Jul 07, 2011 10:44 am    Post subject: Reply with quote

I've the exact same thing on my queens, just on a couple of plants. I pulled one last night and everything was well in order. Like Lius, my plants didnt get very big and I never noticed the flowers but the spuds are all spotless and decent size. Not a massive haul but I got about 6-8 decent sized spuds from it and they tasted grand.
Back to top
View user's profile Send private message Visit poster's website
greengiant
Rank attained: Hawthorn Tree
Rank attained: Hawthorn Tree


Joined: 27 Mar 2009
Posts: 67
Location: Co. Kildare

PostPosted: Tue Jul 19, 2011 10:44 pm    Post subject: Reply with quote

Sorry for delay in getting back. Thanks for the comments. Potatoes seem fine - dug up one plant & got 17 nicely sized & perfectly formed spuds, tasted nice too!
Back to top
View user's profile Send private message
tippben
Rank attained: Vegetable garden tender


Joined: 15 Jan 2011
Posts: 902
Location: north tipperary

PostPosted: Wed Jul 20, 2011 12:26 am    Post subject: Reply with quote

I had exactly the same infection on my Orlas. I eventually identified it as Alternaria solani. It's different to the classic "famine" blight Phytopthera infestans. Maybe Orla is more susceptible to the former and not the latter? I cut and removed the haulms, and still have a decent crop, apart from some slug and wireworm damage. My tomatoes were luckily not infected.
Back to top
View user's profile Send private message
paul23
Rank attained: Hazel Tree
Rank attained: Hazel Tree


Joined: 14 Jul 2011
Posts: 7

PostPosted: Wed Jul 20, 2011 2:15 pm    Post subject: Reply with quote

Yeah, had something like this last year too. Didn't affect the potatoes at all as far as I could tell, but it had me worried for a bit.
Back to top
View user's profile Send private message
michael brenock
Rank attained: Chlorophyll for blood


Joined: 12 Aug 2008
Posts: 1275
Location: cork

PostPosted: Wed Jul 20, 2011 9:00 pm    Post subject: Reply with quote

the yellowing of the leaves is not a disease but a physiological upset caused by the interaction of weather and nutrients The potatoes had tubers formed by a certain date and the plant was able to bring that number to maturity The potato plant went into the senescence stage no longer producing hew roots or leaves the nutrients were withdrawn from the leaves into the developing and ripening tubers. The alternative would have been a spell of second growth where the tubers develop knobs and uneven swellings. The warm month of April would account for a lot of these unusual colourings. Second growth has the bad effect of upsetting the flavour and "flouriness" of the tubersi .
michael brenock horticultural advisor (retired)
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Irish Gardeners Forum Home -> Vegetable growing, fruit and allotments in Ireland All times are GMT
Page 1 of 1

 

Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group

Privacy Policy | Copyright © 2006 - 2017 IrishGardeners.com (part of GardenPlansIreland.com)