Killing Freezes… Finally

Many people are pleased that typical winter temperatures have taken so long to show up. Below are some interesting observations from early- to mid-winter in New Brunswick.

Relatively warm soil temperatures (as high as mid-60s °F) stimulated growth late into December.

Dandelion bloom on 15 December 2015 in New Brunswick.

Dandelion bloom on 15 December 2015 in New Brunswick.

Had to remove cover (folded up in behind Kyle Genova) from our K-Microdochium Patch trial so that it could be mowed on 16 December 2016!

Removed the permeable growth cover (folded up behind Kyle Genova) from our K-Microdochium Patch trial to mow it on 16 December 2016!

 

 

 

 

 

 

 

Winter flush of seedheads on annual bluegrass

Annual bluegrass can go to seed about anytime of the year but this is a first for me — lots of annual bluegrass seedheads on 28 December 2015 in New Brunswick.

 

 

 

 

 

Kyle Genova pulled back permeable turf cover to inspect annual bluegrass growth and progress of the Microdochium Patch inoculation on 28 December 2015. Turf is still growing and disease is expanding.

Kyle Genova pulled back the permeable turf cover from the K-Microdochium Patch trial on 28 December 2015. The annual bluegrass was still growing enough to schedule another mowing. And the progress of the Microdochium Patch inoculation was expanding (good for the research but ugly!). No disease response to potassium at this point.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Odd to find weed species that are normally gone by this time of the year. Killing frosts/freezes are finally here and frost sensitive plants should be damaged and won’t persist much longer. Cool-season turfgrasses will transition into dormancy if freezing temperatures linger for a while. But it won’t be too long (66 days until spring, 20 March) before annuals like prostrate knotweed will germinate and start to emerge from bare soil areas.

Freeze Injury on Weeds

Don’t recall prostrate knotweed (annual) persisting into January. But freezing temperatures have finally killed the knotweed. Also note that the leaves of broadleaf plantain (perennial) have just now been frost damaged.

 

Kyllinga Awakens as Soil Temps Increase

Daily high soil temperatures at the 2-inch depth are consistently getting into the 60s °F. Yesterday, temperatures in sunny locations reached into the upper 60s. This means that the warm-season species are, or will be soon waking from winter slumber.

Leaf tips emerging from rhizomes of kyllinga on 15 April 2015 in central New Jersey.

Leaf tips emerging from rhizomes of kyllinga on 15 April 2015 in central New Jersey.

For the last three weeks, I have been watching the emergence of false green kyllinga (Kyllinga gracillima). Most sites infested with kyllinga are probably showing active shoot growth. So it appears that kyllinga needs soil temperatures that reach consistently into the 60s to emerge from winter dormancy. As temperatures continue to warm, re-growth of kyllinga should accelerate.

False green kyllinga is a perennial sedge species with well-developed rhizomes (underground lateral spreading stems). Kyllinga is relatively low growing so it [Read more…]

Looks Like Grass… But It Isn’t

Other than today and yesterday, soil temperatures in New Brunswick have been reaching into the lower 50s °F during the last week or so. And you see the effects, some plants are finally awakening from winter slumber. Cool-season turfgrasses are slowly greening up. Tree buds are swelling, some are flowering. Forsythia is just starting to bloom. And prostrate knotweed, one of the earliest germinating summer annual weeds, is emerging.

Prostrate knotweed is frequently found invading [Read more…]

Green Kyllinga Found in North Brunswick

Uh-oh! We now have green kyllinga at Hort Farm No. 2 in North Brunswick. Joe Clark found it in a field that was sprayed with glyphosate. Most everything died but the kyllinga! Carrie Mansue has made some collections of kyllinga and will be doing some herbicide tests in the greenhouse this winter to determine which materials have the best activity on the this very difficult to control weed.

Keep a lookout for this weed, if left alone it will spread by rhizomes. Carrie has visited lawns that were essentially overrun by kyllinga. Once kyllinga achieves that level of dominance, control is nearly impossible without complete renovation. See previous post on the topic.

Live patch in foreground is kyllinga that survived a spray with glyphosate. Yellowed plants to left are yellow nutsedge.

Battling Green and False Kyllinga in New Jersey Turfs

We are seeing and hearing about increasing problems with green and false kyllinga; both are very troublesome invasive weed species that have moved northward into New Jersey. Green kyllinga and false green kyllinga are very similar in appearance, and both are referred to as green kyllinga. Green kyllinga is very difficult to control once large mats form.

These weeds thrive under mowing and are prolific in areas that are poorly drained or frequently wet. If you do not have [Read more…]