Hi Eric,

The Cornell U. Cooperative Extension publication entitled Hayfield Management 
and Grassland Bird Conservation by Jim Ochterski (CCE of Schuler County; 
ja...@cornell.edu<mailto:ja...@cornell.edu>) says this on page 2:

“To be considered good habitat for grassland birds, a grass hayfield needs to 
remain substantially unmown through the breeding season, which begins in early 
May and ends by mid-July across most of New York State. During this time 
hayfields grow vigorously, providing shelter, nesting areas among the grass 
stems, and a source of insects that comprise bird diets. Any significant 
disturbance, like mowing or manure application, will cause most nest to fail. 
Alfalfa hay stands are generally unsuitable for grassland birds.

In New York, breeding grassland birds will begin identifying territories from 
late April through May. Nest building and egg laying occur through early June 
and young birds tend to hatch by mid to late June. The ability to fly for cover 
and feeding(called ‘fledging’ ) develops by early July.”

The article has a calendar which shows the dates May 14 thru July 22 as times 
when MOWING DETRIMENTAL to grassland birds.

Full article here: 


Donna L. Scott
535 Lansing Station Road
Lansing, NY 14882

From: bounce-123584081-15001...@list.cornell.edu 
[mailto:bounce-123584081-15001...@list.cornell.edu] On Behalf Of Eric Banford
Sent: Friday, May 03, 2019 1:31 PM
To: CAYUGABIRDS-L <cayugabird...@list.cornell.edu>
Subject: Re: [cayugabirds-l] bobolinks and yellowthroat

Speaking of Bobolinks, my neighbor just asked me if it was ok to mow now before 
they make their nests. I wasn't sure of best timing for early mowing so wanted 
to touch base with the collective experience on this list. What are best 
practices I can share with my neighbors as far as when to NOT mow (beginning 
and end of season) to support field birds.
Danby, NY
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