If you spray again I'd do half the rate you used the first time. From the pictures it looks like either poa t or bentgrass that has the bleaching. Hard to tell but I don't think it's poa a.

 

Thanks, snowbob. You're right - some of that bleaching is definitely bentgrass. I'm going to try and see whether the Tenacity has killed it and there's good grass coming through, or whether it's regenerating. If the latter, I may try another half rate app of Tenacity.

 

If I remember correctly bent takes a few apps before it dies. It will eventually die though. That grass is a pain but at tenacity will deal with.

 

I would skip the 9-2-2 in July. Your grass is going to be stressed enough with the summer heat, adding nitrogen will only force it to grow when it really just wants to lay dormant.

In August you can start a Fall spoon feeding program with Urea - easily found at TSC (closest one to you might be Milton. Not sure if there is one in Burlington).

 

@Argon 0.55oz? This will kill the lawn. 4-8oz/acre is per the label. I would hit 2 more times the white spots with 2oz/A, 2 weeks apart. This is 1.5ml per 1000sqf!

 

@Argon 0.55oz? This will kill the lawn. 4-8oz/acre is per the label. I would hit 2 more times the white spots with 2oz/A, 2 weeks apart. This is 1.5ml per 1000sqf!

You're quite right! Thanks, Babameca. Got my numbers mixed up. I meant my Tenacity app was actually at 2.465 ml / 0.0835 ounces per 1,000 sq ft. Original post now amended.

I will hit those white spots twice more, 2 weeks apart then at the lower rate you specify. Thanks again.

 

I would skip the 9-2-2 in July. Your grass is going to be stressed enough with the summer heat, adding nitrogen will only force it to grow when it really just wants to lay dormant.

In August you can start a Fall spoon feeding program with Urea - easily found at TSC (closest one to you might be Milton. Not sure if there is one in Burlington).

That's great feedback - thanks, Harts. I will stock up on some Urea instead then. Would you just go right through to the end of the year then spoonfeeding Urea rather than any more traditional synthetic fertilizer options? I know I should have a soil test done to see whether I need P or K or anything else, so I guess the answer probably depends on that...?

 

If I remember correctly bent takes a few apps before it dies. It will eventually die though. That grass is a pain but at tenacity will deal with.

Thanks, babaganoosh. Tenacity it will be then.

 

I would skip the 9-2-2 in July. Your grass is going to be stressed enough with the summer heat, adding nitrogen will only force it to grow when it really just wants to lay dormant.

In August you can start a Fall spoon feeding program with Urea - easily found at TSC (closest one to you might be Milton. Not sure if there is one in Burlington).

That's great feedback - thanks, Harts. I will stock up on some Urea instead then. Would you just go right through to the end of the year then spoonfeeding Urea rather than any more traditional synthetic fertilizer options? I know I should have a soil test done to see whether I need P or K or anything else, so I guess the answer probably depends on that...?

A soil test is always recommended. Truth be told, I've never done one. I'm sure my lawn is deficient in something, but I'm also happy with how it looks. I also don't plan on being in the house too much longer...but I digress.

I spread 1lb N per K of the 9-2-2 in April every year. Beginning in May I start PGR + Iron apps every 3 weeks or so. In that tank I mix 0.25lb Urea (0.12lb N). It's a minimal amount of N.

In August I start spoon feeding 0.25lb urea every week for 8-10 weeks.

There are so many different fert programs. What I do works for me. It's easy and I don't spend a ton of money. The Urea I bought will last me years - I also only have 2,500 sf. Even the 9-2-2 lasted 2+ years.

The best thing we can all do is try out different things and find what works best then stick with it. If you wanted to put down 05lb N from the 9-2-2 in August, you could start spoon feeding Urea in September. You could also do 0.5lb N in April, 0.5lb N in June then spoon feed urea beginning in August. So many options!

 

I would skip the 9-2-2 in July. Your grass is going to be stressed enough with the summer heat, adding nitrogen will only force it to grow when it really just wants to lay dormant.

In August you can start a Fall spoon feeding program with Urea - easily found at TSC (closest one to you might be Milton. Not sure if there is one in Burlington).

That's great feedback - thanks, Harts. I will stock up on some Urea instead then. Would you just go right through to the end of the year then spoonfeeding Urea rather than any more traditional synthetic fertilizer options? I know I should have a soil test done to see whether I need P or K or anything else, so I guess the answer probably depends on that...?

A soil test is always recommended. Truth be told, I've never done one. I'm sure my lawn is deficient in something, but I'm also happy with how it looks. I also don't plan on being in the house too much longer...but I digress.

I spread 1lb N per K of the 9-2-2 in April every year. Beginning in May I start PGR + Iron apps every 3 weeks or so. In that tank I mix 0.25lb Urea (0.12lb N). It's a minimal amount of N.

In August I start spoon feeding 0.25lb urea every week for 8-10 weeks.

There are so many different fert programs. What I do works for me. It's easy and I don't spend a ton of money. The Urea I bought will last me years - I also only have 2,500 sf. Even the 9-2-2 lasted 2+ years.

The best thing we can all do is try out different things and find what works best then stick with it. If you wanted to put down 05lb N from the 9-2-2 in August, you could start spoon feeding Urea in September. You could also do 0.5lb N in April, 0.5lb N in June then spoon feed urea beginning in August. So many options!

Thanks again, Harts, for that handful of permutations to think about. I guess I'll just feel my way along (within the parameters of conventional wisdom on these topics) and keep a close eye on what sort of signals the lawn gives me. The satisfying thing is that my efforts so far this year seem to have made a huge impact. On the other hand, I now see problems and imperfections everywhere 😁

 

You will always see imperfections. That comes with this hobby.

There are very few absolutes in lawn care. Just guidelines. Feel free to push them to suit your needs and goals.

 

What fresh horror is this? I hit my patches of bentgrass with a second app of Tenacity 12 days ago, but this time at a half rate. A lot of the bentgrass appears to have died off, but now I have this fairly broad-leafed stuff popping up in the middle. Does anyone know what it is?

 

Could be quackgrass or clumping fescue. If it's either one, glyphosate. Need to nuke it.

 

Thanks for the quick reply, Harts. I've got so much stuff going on in this lawn that I'm beginning to think my best option is to nuke everything and start again. I'm planning a major landscape revision though over the next couple of years so, until then, I'm just going to have to limp along and do my best. At least it'll be a learning experience as I build up to a full reno.