August 13, 2019

GDD update 8.13.19

I think this is the first time I have done the reading 5 days apart – which it how far out the prediction goes.  The predictions are remarkably good.  Most are no more than 10 points out (max was 20) and only one was lower than predicted by a few points.

 

Check out some other tools. The Climate Smart Farming GDD calculator lets you put in your address or click on the map for a location. I’m not sure where they get their data from and how it is calculated to a specific site.  My house in Ithaca is almost 100 GDD points lower than the campus location – but that is probably correct.  You can also put in several locations and compare them.

 

It is aimed more at crop development – for example, you can put in a planting date and the GDD Base that is the default is 50/86 as it is based on the fact that crops don’t develop much under 50 F and over 86 F.  You can choose other bases

 

By comparison, in the NEWA system we’ve been using I selected a March 1 start date, not because of planting but because we usually don’t have much insect development before that and the GDD accumulated in a spring thaw throws things off a bit.  Also, we use the GDD base of 50F with no upper limit – which isn’t perfect at very high temperatures, either.

 

The CSF system lets you put in a GDD target – for example, if you knew the second generation of spruce spider mites is expected to start at GDD 2375, you could put in a target of 2200 to give yourself some leeway and it will indicate for each site >2 weeks to target, <2 weeks to target or target has been reached.

 

Try it out!

 

There are several other tools under the Tools tab. An interesting one tells you climate change for your county since 1950 with a variety of different measures. http://climatesmartfarming.org/tools/csf-county-climate-change/

 

 

A few new things to add:

 

Spruce spider mite – 2375- 2806 GDD (notice how I worked that in above 😊 ) – for a few of you on Long Island

Doug fir needle midge – remove heavily infested trees (carefully so you don’t spread the pest) before larvae exit the needles (needles will turn

brown)

Mark infested trees for placing traps in the spring

 

And the others just keep rolling on:

 

Elongate hemlock scale – keep scouting for crawlers.

Cooley spruce gall adelgid – prune out galls on spruce before they turn brown (about 1850)

Cryptomeria scale crawlers – 1750-2130 GDD

Japanese beetle adults – 1029-2154 GDD

Two spotted spider mites– 1300-2000 GDD

Pine needle scale 2nd generation– 1290-1917 GDD

 

Have a great week!

August 8, 2019

GDD update 8.8.19

Well, today’s thunder monsoon just went through campus.  What an odd year we are having!

 

From the questions I am getting, some of you are definitely scouting. Congratulations! It certainly isn’t easy but it is the basis for effective pest management.  Keep notes where you see problems so you know where to look next year.

 

Yesterday at Empire Farm Days (no Christmas tree growers ☹) I did a lot of talking about ticks (we have a new livestock preferring one in the Hudson Valley) and spotted lanternfly.  The lanternfly does have implications for Christmas tree growers – for seedlings and for cut trees coming in to the state.  Do you know how to check for the lanternfly?  You can learn all about it at a conference on August 15 in Binghamton – for more information go to: https://nysipm.cornell.edu/resources/nys-ipm-conferences/spotted-lanternfly-our-doorstep/

 

Question went out to the CCE diagnostic list-serve. Are you seeing more poison ivy this year?  While there is research saying that poison ivy thrives with higher CO2 levels, it might just be the adequate moisture (or more than adequate) this spring.

 

No changes on what you should be looking for based on GDD.

 

Elongate hemlock scale – keep scouting for crawlers.

Cooley spruce gall adelgid – prune out galls on spruce before they turn brown

Cryptomeria scale crawlers – 1750-2130 GDD

Japanese beetle adults – 1029-2154 GDD

Two spotted spider mites– 1300-2000 GDD

Pine needle scale 2nd generation– 1290-1917 GDD

 

Have a great week!

August 2, 2019

GDD update 8.2.19

Did I fall off the planet?  Just want to get to August before I emailed again?  Nope – 2 programs on greenhouse IPM plus prep and (partial) clean up.

 

But I’m back now!  Good thing it is a week where there wasn’t much different from last week.

 

Pennsylvania has a great resource that you can download (or buy a hard copy). Google “Integrated Pest Management for Christmas Tree Production” and look for the pdf version.

Spruce spider mite usually reappears later when it is cooler, but I just learned from my Branching Out that they have been finding populations earlier than expected – so scout for them where you usually see them.

If you have Doug fir, scout for the immature fluffy white Cooley spruce gall adelgid or winged adults coming from the pineapple shaped galls on spruce.  Treat Doug fir at 1500-1775 GDD and blue spruce at 1850-1950 GDD.  And make a note to get the galls off earlier next year!

Thanks, Dawn! (editor of Branching Out)

Here’s how to get your own copy:  https://branchingout.cornell.edu/

 

Things to do this week:

Elongate hemlock scale – keep scouting for crawlers.

Cooley spruce gall adelgid – prune out galls on spruce before they turn

Cryptomeria scale crawlers – 1750-2130 GDD

Japanese beetle adults – 1029-2154 GDD

Two spotted spider mites– 1300-2000 GDD

Pine needle scale 2nd generation– 1290-1917 GDD

July 24, 2019

GDD update 7.24.19

Now that was some GDD generating weather last weekend! Probably didn’t cook any critters, though.  Just us.

 

Please keep an eye out for a survey I’ll send you on this project.  I’ll keep sending GDD updates as long as they make sense but the final report is coming due and I need to know what you think.

 

This project is good for me as I keep learning things!  Not all sources agree and sometimes I have to look for more information to make things make sense!

 

If you have elongate hemlock scale you should keep scouting until October for crawlers.  The old scale covers will stay on so you can’t just look for the obvious presence of the scale.  Looking for those small crawlers is why you have a handlens, right. Chemical control shouldn’t be applied more than 4 times in 12 weeks.

 

There is (almost always) scouting – and a few other things to do:

 

Cooley spruce gall adelgid – prune out galls on spruce before they turn brown – which is right about now.

Cryptomeria scale crawlers – 1750-2130 GDD

Japanese beetle adults – 1029-2154 GDD

Two spotted spider mites– 1300-2000 GDD

Pine needle scale 2nd generation– 1290-1917 GDD

 

 

Have a great week!

 

July 17, 2019

GDD update 7.15.19

Gorgeous weather for the CTFANY meeting and nice to see lots of growers and others!  Thanks, Kendra and all your crew.

 

GDD and spotted lanternfly – some research folks in PA think that the GDD required for the complete life cycle of the spotted lanternfly might limit its spread north – even though the eggs could survive the cold.  That’s good news!

 

Judging by questions at the meeting – Fir fern rust is out now.  Yellowing and dropping needles are probably what you will notice. A closer look and you will see the fungus popping its white fuzzy aecia out of the backs of needles.  I’ve mostly seen it on Concolor but it can affect others http://plantclinic.cornell.edu/factsheets/firfernrust.pdf.

It is usually just an occasional pest – not showing up every year.  Wet spring, perhaps?  You can remove the alternate host – ferns – from the farm, but the spores do move quite a distance.

And one sample with what we decided were teethmarks.  Voles, perhaps?

Thanks for bringing us samples!  We do see the most interesting things.

 

What to scout for now:

Cryptomeria scale crawlers – 600-800 GDD

Just finishing the first spray window at the coolest locations I’m following and almost ready to start again at the warmest (1750-2130 GDD)

 

Japanese beetle adults – 1029-2154 GDD

Two spotted spider mites– 1300-2000 GDD

Pine needle scale 2nd generation– 1290-1917 GDD

Cryptomeria scale crawlers – 600-800 GDD

Have a great week!

 

July 9, 2019

GDD update 7.8.19

Gorgeous day today – although sweat was dripping down my nose while I was digging plants this morning.  And collecting lily leaf beetle larvae. I live a charmed existence (really I do as I like all those things).

 

We are in that season where most of the eggs are laid, or larvae burrowing, or adults hiding from the heat.  The last few 1st generation pests are just about done and the 2nd generation hasn’t started for many yet.  Most insects – in NYS – only have one generation per year – thank heavens.  If you control them in the right window, you are done for the year. That can change as climates change unfortunately.

 

We have started looking at the insects we are catching in the habitat plots near our Christmas tree planting to see if we find pest, beneficials, or some that just wandered by.  We have 3 methods for catching insects – pan traps for flying insects, pitfall traps for soil insects, and sweep netting for those on the foliage.  Getting them all id’ed will be a chore but we are trying to have enough information to make some sense for our field day in September.   Lots of hover flies – a predator of aphids – in some plots.  Will that result in reduced balsam twig aphid?  We hope so.

 

Jason Dombroskie, who runs Cornell’s insect diagnostic lab, was helping (wow, is he good!).  I learned that white pine weevil is one of the adult insects that survives the longest.  John Freckleton can support that as he has white pine weevil traps and always tells me how many he has caught.

 

Things to look out for:

 

Japanese beetle adults will feed on leaders of fir and maybe other species.  1029-2154 GDD

They also lay eggs that become grubs that can feed on roots.  Japanese beetle traps are good at catching adults but the worry is that they pull them in but don’t catch them all.  If you use them, be careful where you put them.

 

Two spotted spider mites will start up again – 1300-2000 GDD

They like the heat.  And dust makes them happy.  Pesticides that kill off beneficial mites will sometimes result in a flush of the species we don’t want.  Also excess nitrogen makes them happy.

 

Pine needle scale 2nd generation is about to start – 1290-1917 GDD

 

The last few of the ones you’ve been watching:

 

Cryptomeria scale crawlers – 600-800 GDD

Elongate hemlock scale crawlers – 360-700 GDD

Bagworm – 650-750 GDD

 

Have a great week – and see you at Franke’s if you are going to the summer CTFANY meeting.