April 5, 2016

Christmas tree IPM update 4.4.16

Snow? Of course.  But it is supposed to leave more quickly and then not come back.  Must have forgotten to put in my order for spring weather.  Does it give you a break or goof up your planting plans?

It must be spring!  The first issue of Branching Out is out. Want to know how to get NY based scouting help for your trees (and nursery crops, too)?  Here you go!   A few things this issue covers – Weir’s cushion rust and elongate hemlock scale.

The question we have been asking about blue spruce – Is it needle cast disease or something else? From the Ontario nursery crops blog.

And do you know what eriophyid mite damage looks like?  Another reason needles might be falling off of a variety of conifers. They like it cool so scout now (once the snow is off the needles) – but remember they are VERY small. (Already reported in the 3/24 PA Christmas Tree Scouting report)

Not so sweet if it is in your fields.  Honeysuckle breaks bud early which can help identify it for control.

What’s in your crystal ball?  MD has a new pest prediction calendar.  The Tree and Shrub guidelines have more species, but this has phenology information for some weeds and wildflowers, which might be right there on your farm.

Coming soon?  Depending on our weather of course.  Balsam twig aphids nymphs.  Do a tap test of twigs near those affected last year to find the nymphs that will crawl to breaking buds and produce lots more aphids.

March 22, 2016

Christmas Tree IPM Update 3.22.16

Just a little snow fell at my house yesterday but it still feels springy!

And that leads us directly into the first question I received this spring:  When should I treat for white pine weevil?  Now (although maybe a slightly warmer day than today) urging by the Cornus maas blooming outside my office window and the silver maple I saw blooming in Geneva last week.  7-58 growing degree days.  You are trying to control the adults before they lay eggs and you know how a young white pine weevil’s fancy turns to love in the early spring.  Target the top third of the plant where they hang out.

Brian’s blog post on wpw:
For more pictures:
Do you get Sarah Pickel’s PA Christmas tree IPM report?  A good way to see what is heading our way.  Contact her at: c-sapickel@pa.gov
Sarah Pickel | IPM Education Specialist
PA Department of Agriculture | Bureau of Plant Industry
2301 North Cameron Street | Harrisburg, PA 17110
P: 717-772-5227

What is she seeing besides white pine weevil?
Pales weevil – larger than White pine weevil and with different habits.  While mostly a pine problem, the adults will feed on the bark of other conifers resulting in flagged or dead branches.  Eggs and larvae are only found in newly cut (less than a year) pine stumps so chipping or removing pine stumps is a good management practice.

Eriophyid mites – just starting.  These mites are tiny so it takes close scouting.  They can be carrot shaped or more elongated.  The eggs may be in clusters on the bottom of the needles.  Just a bit larger than the stomata spots.  There is a threshold for this pest – 80% of twigs with mites and at least 8 mites on a single needle on one shoot.  Get your hand lenses out!
Are you out in the trees yet?  I bet you are on the warm days.  Seems appealing when I am in my office.  I did walk my  conifer plantation the other day, though!  Lost one but the other 8 are happy.  🙂

Have a great week!