Archive for May, 2014

Use care with PGR’s in the cold!

Most people are very aware of potential damage to turf when using PGR’s at high rates in the heat of the summer. However, cold temperatures can also exacerbate PGR damage.  In particular, Proxy and cold weather do not mix. When Proxy is applied during periods of freezing or near-freezing temperatures (usually night-time temperatures), it can do significant damage to creeping bentgrass, turning it purple and slowing growth.  This can even happen with night-time temperatures in the 40’s.  Timing is critical with Proxy so superintendents will often try to get it out sooner than later but they do risk bentgrass damage if applications are too early.  Luckily, this damage recovers within a few weeks.  Little to no damage will be observed on Poa under the same conditions.  With the cold spring of 2014, these symptoms have been widely prevalent.   In addition, I know of one course seeing extreme damage to bentgrass with the application of PoaCure.  This is the first incidence I am aware of where PoaCure has cooked bentgrass at cold temperatures but it is something to be aware of.  PoaCure is a new material and a learning curve is often involved with new products.  It is unclear how cold temperatures need to be to cause damage and whether a precipitation component is involved in this particular situation but superintendents should test any new material thoroughly before applying it too widely.

Categories: Managment Practices

Still all quiet….

We’ve had a long, cold spring this year and  disease has been correspondingly slow to respond.  Cool season root Pythium has been active in a number of spots but very little else has been observed.  Compared to last year (and the two before it), Southern Rhode Island is almost a full month behind schedule. Some locations are still seeing green-up just now and other locations in Northern Maine still have ice and snow on the ground.  The biggest issue I have seen this spring is winterkill and we have not had this much of it in many years.  In fact, some northern courses have recently stimulated winterkill/damage by removing covers too early.  Obviously, damage varies but areas with poor drainage, standing water and which had visible ice are going to be the hardest hit.  The only solution at this point is a lot of seed. Winterkill is not a regular phenomenon in Southern New England but dealing with it preemptively through site changes can reduce its occurrence even further.

Categories: Weekly Update