THE 5 BEST Crabgrass Killers (2021) Post Emergent ... | 農藥合法資訊網

2020年6月30日—Tenacityisbestsuitedforsmaller,youngercrabgrassplants.Quincloracshouldbeuseonanycrabgrassplantsthatarelargerthanthethreetiller ...

Crabgrass is an invasive annual weed that can quickly get out of hand if not properly prevented using crabgrass preventers and pre-emergent herbicides,[1] or killing crabgrass using post-emergent herbicide weed killer. Crabgrass will begin to germinate when the soil temperatures reach approximately 55 degrees for four or more consecutive days and continue to germinate throughout the spring and early summer months[2] as the ground temps approach 70 degrees. 

Smooth crabgrass and large crabgrass are the two most popular species of crabgrass in cool-season lawns – particularly the Northeast.  Applying a pre-emergent – such as prodiamine in early spring (April) as soil temperatures are consistently in the low 50s, and a second application such as dimension in late May as the soil begins to hit the 60s – will help prevent the germination of new crabgrass.

But what happens...