On behalf of Nick and Andy:
We seem to have bud burst early & mostly in our Meryic with 20% of those to the hands in prayer stage. Rex are a little slower.
I don’t know what has brought on this early bud burst but we have had some good frosts & also a month ago had over 300 mm of rain over 2 weeks; All in all a strange winter.
I am hoping for a reasonably dry summer, as I don’t mind irrigating as opposed to having trees die due to drowning!
Once again thanks for your info.
So this prompted me to look up walnut blight on the internet. There were several helpful sites, one of which provided this table. http://cetehama.ucdavis.edu/files/23087.pdf
|Date||% Buds Open to Prayer Stage|
(These are American dates, so 4/8/06 is the 8th of April 2006, and would be roughly equivalent to 8th October in New Zealand)
University of California Pest Management Guidelines are to spray when 30 to 40% are at this stage. On the strength of this information I have now rescheduled the helicopter for spraying on 20th October. (Thanks Andy)
The bud on the left would be at the right stage for spraying. Obviously buds develop at different times on the tree, and trees even of the same variety will develop at slightly different times.
The NZTCA website now has a blog facility which I was going to tell everyone about, which would be a good forum for this. http://www.treecrops.org.nz/
I might be leading you astray, but to leave a comment, try clicking on the Walnut Blogletter page and then click on ‘Leave a comment’…
[..snip. With the provision of better instructions, you will have discovered you need just the current NZTCA password to read walnut blogletters (apart from the initial blogletter which is not password protected).
To make your first comment (reply), where it invites you to log-in or register, you need to invent and register a personal username as guided by the simple instructions which appear. Soon after, you will receive your own password by email.
Record your username and password in a safe place for future use.
Note: We carefully guard your email address. We take great care not to display email addresses on the web site, and so should you when using this blog facility. To avoid anyone being deluged by spam, simply never advertise anyone’s email address.
These instructions appear in other places more accessible, and in a bit more detail – webber]
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