Proceedings of the Sixty-first Annual Meeting of the Northeastern ...

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Table 1. Autumn 2005 versus spring 2006 applied preemergence herbicides for
smooth crabgrass and mouseear chickweed control in turf.
Rate
Cover
Mouseear
chickweed Crabgrass
Treatments y Lb ai/A Timing 14 Apr. 8 Sept.
⎯⎯⎯⎯⎯ % ⎯⎯⎯⎯
Dithiopyr 0.21G 0.38 4 Nov 8.5 cde z 5.8 b
Dithiopyr 0.21G 0.50 4 Nov 4.0 ef 1.3 cd
Prodiamine 0.20G 0.50 4 Nov 4.8 def 2.3 cd
Prodiamine 0.43G 0.75 4 Nov 10.3 b-e 2.3 cd
Prodiamine 65WG 0.75 4 Nov 0.0 f 1.0 cd
Pendimethalin
3.8CS
3.0 4 Nov 0.3 f 4.3 bc
Dithiopyr 40WP 0.5 4 Nov 0.1 f 6.0 b
Dithiopyr 0.21G 0.38 31 Mar 20.0 a 2.9 bcd
Dithiopyr 0.21G 0.50 31 Mar 11.8 bcd 0.8 cd
Prodiamine 0.20G 0.50 31 Mar 16.3 ab 1.0 cd
Prodiamine 0.43G 0.75 31 Mar 13.0 abc 0.6 d
Prodiamine 65WG 0.75 31 Mar 12.3 bcd 1.3 cd
Pendimethalin
3.8CS
3.0 31 Mar 8.3 cde 2.3 cd
Dithiopyr 40WP 0.5 31 Mar 7.3 cdef 2.8 bcd
Untreated -- -- 10.0 b-e 20.3 a
y Treatments were applied on either November 4, 2005 or March 31, 2006.
z
Means in a column followed by the same letters are not significantly different
according to Fisher’s LSD test (P≤0.05).
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