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Crabgrass/Annual Bluegrass Preemergence Timer (GDD 32)
through Fri, Jun. 26. 2026

 

GDD Total: 2644 (Base 32) through Fri, Jun. 26, 2026

  

Waterford, MI

        

Forecast »

“Flashback” to 2025

6/20

6/21

6/22

6/23

6/24

6/25

6/26

6/27

6/28

6/29

6/30

7/1

7/2

Done

801

Late

500

Optimum

250

Early

171

Under

0

 

Generously Supported By:



Tabular Data

Daily GDD accumulation for various base temperature models in 2025 & 2026

2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 26° 47° 15 5 0 0 0
02-16 28° 54° 34 14 0 0 0
02-17 35° 51° 55 25 1 0 0
02-18 37° 50° 76 36 3 0 0
02-19 32° 39° 90 40 3 0 0
02-20 33° 41° 105 45 3 0 0
02-21 30° 33° 114 45 3 0 0
02-22 28° 31° 121 45 3 0 0
02-23 18° 27° 122 45 3 0 0
02-24 14° 32° 123 45 3 0 0
02-25 20° 33° 127 45 3 0 0
02-26 12° 33° 128 45 3 0 0
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 27° 56° 147 54 3 0 0
02-28 23° 50° 162 59 3 0 0
03-01 14° 26° 162 59 3 0 0
03-02 16° 33° 165 59 3 0 0
03-03 24° 39° 174 59 3 0 0
03-04 25° 48° 189 63 3 0 0
03-05 36° 42° 205 70 3 0 0
03-06 35° 51° 227 81 4 0 0
03-07 45° 65° 259 104 17 5 0
03-08 39° 59° 286 121 24 5 0
03-09 44° 70° 321 146 39 12 2
03-10 42° 63° 352 167 50 15 2
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 32° 56° 374 179 52 15 2
03-12 28° 41° 387 181 52 15 2
03-13 27° 47° 402 187 52 15 2
03-14 26° 39° 413 187 52 15 2
03-15 31° 69° 440 205 60 15 2
03-16 20° 65° 461 216 60 15 2
03-17 16° 23° 461 216 60 15 2
03-18 16° 32° 463 216 60 15 2
03-19 31° 52° 483 226 60 15 2
03-20 35° 68° 512 245 70 16 2
03-21 34° 43° 529 252 70 16 2
03-22 32° 51° 548 261 70 16 2
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 27° 34° 557 261 70 16 2
03-24 19° 45° 567 261 70 16 2
03-25 32° 60° 590 275 74 16 2
03-26 40° 65° 621 296 84 19 2
03-27 25° 36° 630 296 84 19 2
03-28 25° 42° 641 297 84 19 2
03-29 33° 54° 663 309 86 19 2
03-30 42° 72° 697 333 101 26 4
03-31 52° 75° 739 365 122 39 12
04-01 31° 45° 755 371 122 39 12
04-02 32° 54° 775 381 123 39 12
04-03 47° 65° 809 405 137 45 13
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 37° 59° 835 421 143 45 13
04-05 34° 45° 853 429 143 45 13
04-06 30° 47° 869 435 143 45 13
04-07 22° 37° 877 435 143 45 13
04-08 26° 53° 894 443 143 45 13
04-09 45° 69° 929 467 158 52 15
04-10 40° 56° 955 483 163 52 15
04-11 36° 55° 978 497 167 52 15
04-12 41° 79° 1017 525 185 62 20
04-13 60° 78° 1064 562 212 81 34
04-14 64° 78° 1113 601 241 102 50
04-15 60° 69° 1155 634 264 117 60
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 55° 65° 1193 662 282 127 65
04-17 50° 69° 1231 689 299 136 70
04-18 41° 62° 1260 709 309 138 70
04-19 34° 47° 1279 718 309 138 70
04-20 29° 45° 1294 722 309 138 70
04-21 35° 70° 1325 743 320 140 70
04-22 45° 74° 1362 771 337 150 74
04-23 46° 78° 1402 801 357 162 81
04-24 52° 76° 1445 833 380 176 91
04-25 46° 56° 1474 852 389 178 91
04-26 41° 64° 1504 873 399 180 91
04-27 45° 69° 1539 898 414 187 92
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 51° 63° 1574 923 429 194 94
04-29 44° 50° 1599 938 434 194 94
04-30 40° 52° 1623 952 438 194 94
05-01 39° 48° 1645 963 440 194 94
05-02 35° 47° 1664 973 440 194 94
05-03 34° 63° 1691 989 446 194 94
05-04 46° 75° 1729 1018 465 205 100
05-05 49° 66° 1764 1043 480 212 102
05-06 44° 52° 1790 1059 486 212 102
05-07 38° 54° 1814 1073 490 212 102
05-08 37° 63° 1843 1091 498 212 102
05-09 44° 69° 1877 1116 513 219 104
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 39° 59° 1904 1132 519 219 104
05-11 38° 57° 1929 1148 525 219 104
05-12 33° 58° 1953 1161 529 219 104
05-13 43° 58° 1982 1180 537 219 104
05-14 45° 64° 2014 1202 550 224 104
05-15 40° 70° 2047 1226 563 229 104
05-16 52° 81° 2092 1260 588 246 116
05-17 61° 84° 2142 1301 618 268 133
05-18 68° 87° 2197 1346 653 295 155
05-19 63° 85° 2250 1388 685 319 175
05-20 47° 69° 2286 1414 702 328 178
05-21 39° 62° 2314 1433 710 328 178
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 43° 65° 2347 1455 722 332 178
05-23 52° 57° 2379 1478 735 337 178
05-24 52° 63° 2415 1503 751 344 180
05-25 55° 78° 2460 1538 775 361 192
05-26 52° 81° 2504 1573 800 378 204
05-27 58° 81° 2552 1610 827 397 218
05-28 53° 70° 2592 1640 847 409 225
05-29 45° 81° 2633 1671 868 422 233
05-30 51° 70° 2671 1699 887 433 238
05-31 45° 76° 2709 1728 905 443 243
06-01 49° 77° 2750 1759 926 456 252
06-02 48° 76° 2791 1789 946 468 259
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 49° 82° 2834 1822 970 484 269
06-04 55° 85° 2882 1860 998 504 284
06-05 61° 82° 2931 1900 1027 525 301
06-06 67° 84° 2984 1943 1060 550 321
06-07 57° 80° 3031 1980 1087 569 334
06-08 54° 86° 3079 2018 1115 589 349
06-09 68° 80° 3131 2060 1147 613 369
06-10 71° 88° 3189 2107 1185 643 393
06-11 69° 87° 3245 2153 1221 671 416
06-12 64° 77° 3294 2192 1249 691 432
06-13 59° 84° 3343 2232 1279 713 449
06-14 57° 71° 3386 2264 1301 727 458
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 48° 72° 3424 2292 1319 737 463
06-16 55° 73° 3466 2324 1341 751 472
06-17 55° 68° 3505 2354 1361 763 479
06-18 60° 67° 3546 2385 1382 776 487
06-19 54° 74° 3589 2417 1405 791 496
06-20 56° 73° 3631 2450 1427 805 506
06-21 53° 74° 3673 2481 1448 818 514
06-22 57° 74° 3716 2515 1472 834 525
06-23 53° 74° 3758 2546 1494 847 533
06-24 51° 73° 3798 2576 1514 860 540
06-25 59° 77° 3844 2612 1540 878 553
06-26 56° 71° 3885 2644 1561 891 562
2026Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 56° 79° 3931 2679 1587 908 574
06-28 58° 84° 3980 2718 1616 929 590
06-29 63° 90° 4034 2763 1650 956 612
06-30 72° 98° 4097 2816 1693 991 642
07-01 75° 98° 4162 2870 1738 1028 673
07-02 74° 99° 4226 2925 1782 1064 705
07-03 73° 94° 4288 2976 1824 1098 733
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-15 19° 31° 3 0 0 0 0
02-16 20° 28° 5 0 0 0 0
02-17 7° 19° 5 0 0 0 0
02-18 -0° 15° 5 0 0 0 0
02-19 2° 16° 5 0 0 0 0
02-20 14° 21° 5 0 0 0 0
02-21 21° 30° 8 0 0 0 0
02-22 16° 29° 9 0 0 0 0
02-23 21° 35° 15 0 0 0 0
02-24 30° 48° 32 7 0 0 0
02-25 37° 52° 55 20 3 0 0
02-26 27° 39° 66 21 3 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
02-27 34° 41° 81 26 3 0 0
02-28 29° 54° 101 36 3 0 0
03-01 19° 37° 107 36 3 0 0
03-02 17° 28° 107 36 3 0 0
03-03 18° 37° 113 36 3 0 0
03-04 33° 46° 131 43 3 0 0
03-05 35° 53° 153 56 5 0 0
03-06 25° 33° 160 56 5 0 0
03-07 28° 37° 171 56 5 0 0
03-08 20° 36° 177 56 5 0 0
03-09 32° 54° 198 67 6 0 0
03-10 34° 64° 225 84 13 0 0
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-11 33° 55° 247 96 15 0 0
03-12 29° 46° 263 102 15 0 0
03-13 27° 58° 284 113 16 0 0
03-14 35° 71° 314 133 27 3 0
03-15 56° 72° 356 165 49 17 9
03-16 30° 57° 378 177 50 17 9
03-17 26° 44° 391 180 50 17 9
03-18 34° 66° 419 198 59 17 9
03-19 53° 71° 460 229 79 29 16
03-20 31° 57° 482 241 81 29 16
03-21 24° 52° 498 246 81 29 16
03-22 28° 48° 514 252 81 29 16
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
03-23 22° 39° 522 252 81 29 16
03-24 34° 41° 538 258 81 29 16
03-25 27° 42° 550 260 81 29 16
03-26 26° 42° 562 262 81 29 16
03-27 25° 55° 580 270 81 29 16
03-28 39° 65° 611 291 91 32 16
03-29 56° 68° 650 321 111 44 23
03-30 51° 66° 687 347 128 52 27
03-31 35° 57° 711 361 132 52 27
04-01 23° 42° 722 362 132 52 27
04-02 32° 49° 740 371 132 52 27
04-03 44° 63° 772 392 143 55 27
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-04 35° 51° 793 403 144 55 27
04-05 41° 49° 816 416 147 55 27
04-06 32° 44° 832 422 147 55 27
04-07 27° 44° 846 426 147 55 27
04-08 22° 36° 853 426 147 55 27
04-09 24° 45° 865 429 147 55 27
04-10 32° 36° 878 431 147 55 27
04-11 30° 51° 896 439 147 55 27
04-12 27° 55° 915 449 147 55 27
04-13 38° 55° 940 464 152 55 27
04-14 45° 70° 976 489 168 63 30
04-15 39° 51° 999 503 171 63 30
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-16 34° 51° 1020 513 172 63 30
04-17 29° 60° 1043 526 175 63 30
04-18 50° 79° 1085 559 197 78 39
04-19 48° 68° 1122 585 213 86 42
04-20 37° 56° 1146 599 218 86 42
04-21 46° 71° 1183 626 234 94 46
04-22 41° 64° 1213 646 245 97 46
04-23 46° 75° 1252 675 264 107 51
04-24 49° 82° 1295 708 287 122 61
04-25 52° 75° 1336 740 308 136 70
04-26 42° 57° 1364 757 316 136 70
04-27 37° 66° 1394 777 325 137 70
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
04-28 44° 73° 1430 803 341 146 73
04-29 50° 83° 1474 838 366 162 85
04-30 36° 62° 1502 855 374 162 85
05-01 44° 68° 1536 879 388 169 86
05-02 53° 67° 1574 907 406 179 91
05-03 44° 52° 1600 923 412 179 91
05-04 40° 53° 1624 938 416 179 91
05-05 48° 67° 1660 963 431 186 93
05-06 53° 60° 1694 987 445 192 94
05-07 50° 75° 1734 1017 466 204 102
05-08 41° 55° 1760 1033 472 204 102
05-09 34° 63° 1787 1050 479 204 102
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-10 46° 76° 1826 1079 497 215 107
05-11 43° 67° 1859 1102 511 220 108
05-12 45° 80° 1899 1133 531 233 115
05-13 63° 68° 1942 1166 554 248 125
05-14 60° 74° 1988 1201 579 265 137
05-15 58° 81° 2035 1238 607 284 152
05-16 59° 82° 2084 1277 635 305 167
05-17 55° 70° 2124 1308 656 318 175
05-18 52° 60° 2158 1332 670 324 176
05-19 44° 57° 2187 1350 679 324 176
05-20 38° 55° 2211 1364 683 324 176
05-21 47° 51° 2238 1382 690 324 176
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
05-22 47° 52° 2266 1399 698 324 176
05-23 40° 53° 2290 1414 702 324 176
05-24 41° 61° 2319 1433 711 325 176
05-25 40° 64° 2349 1453 721 327 176
05-26 42° 70° 2383 1477 735 333 177
05-27 50° 72° 2422 1506 754 344 183
05-28 52° 59° 2456 1529 767 349 183
05-29 54° 64° 2492 1556 784 358 187
05-30 51° 76° 2534 1587 805 371 196
05-31 48° 63° 2567 1611 819 377 196
06-01 41° 67° 2599 1632 831 381 196
06-02 43° 78° 2638 1661 850 392 202
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-03 55° 86° 2686 1700 878 412 218
06-04 63° 82° 2737 1740 909 435 235
06-05 55° 69° 2777 1770 929 447 242
06-06 56° 76° 2821 1804 953 463 253
06-07 54° 78° 2865 1838 977 479 264
06-08 57° 76° 2909 1873 1001 495 276
06-09 58° 77° 2955 1908 1027 513 288
06-10 51° 72° 2994 1938 1046 524 295
06-11 52° 85° 3041 1974 1073 543 308
06-12 60° 75° 3086 2010 1098 560 321
06-13 56° 71° 3128 2041 1120 574 329
06-14 55° 77° 3172 2075 1143 589 340
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-15 55° 79° 3217 2110 1169 607 352
06-16 57° 83° 3265 2148 1196 626 367
06-17 62° 88° 3317 2191 1229 651 387
06-18 67° 79° 3369 2232 1260 674 405
06-19 61° 72° 3413 2267 1285 691 417
06-20 59° 76° 3459 2302 1311 709 429
06-21 66° 88° 3514 2347 1346 736 451
06-22 77° 92° 3577 2400 1388 770 481
06-23 74° 94° 3638 2452 1430 804 510
06-24 73° 91° 3699 2502 1470 836 537
06-25 71° 79° 3752 2545 1503 861 557
06-26 65° 84° 3804 2588 1536 886 577
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
06-27 72° 89° 3863 2636 1575 917 602
06-28 67° 77° 3913 2676 1605 939 619
06-29 61° 87° 3965 2718 1636 962 638
06-30 68° 81° 4017 2761 1669 987 658
07-01 70° 83° 4072 2805 1704 1014 679
07-02 62° 85° 4123 2847 1735 1037 698
07-03 66° 84° 4176 2890 1768 1062 717
07-04 61° 87° 4228 2932 1800 1086 736
07-05 68° 91° 4285 2979 1837 1115 761
07-06 71° 91° 4345 3028 1877 1147 787
07-07 64° 75° 4393 3066 1904 1166 802
07-08 56° 83° 4440 3103 1932 1186 816
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-09 67° 79° 4491 3144 1963 1209 834
07-10 62° 85° 4542 3186 1994 1232 853
07-11 64° 84° 4595 3228 2027 1257 872
07-12 71° 86° 4651 3275 2063 1285 895
07-13 69° 86° 4707 3320 2099 1313 918
07-14 63° 84° 4759 3362 2131 1337 937
07-15 63° 88° 4813 3406 2164 1362 958
07-16 70° 85° 4868 3451 2200 1390 980
07-17 64° 75° 4916 3489 2228 1410 995
07-18 54° 77° 4959 3522 2251 1425 1005
07-19 59° 81° 5007 3560 2279 1445 1020
07-20 65° 79° 5056 3600 2308 1466 1037
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
07-21 57° 77° 5102 3635 2333 1483 1049
07-22 53° 81° 5147 3670 2359 1501 1061
07-23 58° 88° 5198 3711 2390 1524 1079
07-24 73° 95° 5260 3763 2432 1558 1108
07-25 72° 84° 5316 3809 2468 1586 1131
07-26 69° 81° 5369 3852 2501 1611 1151
07-27 72° 91° 5428 3902 2540 1642 1178
07-28 69° 89° 5485 3949 2577 1671 1201
07-29 69° 87° 5541 3994 2613 1699 1224
07-30 63° 84° 5593 4036 2645 1723 1243
07-31 60° 74° 5638 4071 2670 1740 1255
08-01 56° 76° 5682 4105 2694 1756 1266
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-02 53° 78° 5725 4139 2717 1771 1277
08-03 57° 80° 5772 4175 2744 1790 1290
08-04 58° 82° 5820 4213 2771 1809 1305
08-05 62° 84° 5870 4254 2802 1832 1323
08-06 64° 83° 5922 4295 2834 1856 1341
08-07 64° 84° 5974 4338 2866 1880 1361
08-08 65° 88° 6029 4382 2901 1907 1382
08-09 69° 89° 6086 4429 2938 1936 1406
08-10 69° 91° 6144 4477 2976 1966 1431
08-11 70° 90° 6202 4525 3014 1996 1456
08-12 69° 89° 6259 4572 3051 2025 1480
08-13 68° 82° 6312 4615 3084 2050 1500
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-14 62° 83° 6363 4656 3115 2073 1518
08-15 63° 85° 6415 4698 3147 2097 1537
08-16 66° 89° 6471 4744 3183 2125 1560
08-17 62° 80° 6520 4784 3212 2146 1576
08-18 54° 80° 6565 4818 3237 2163 1588
08-19 64° 75° 6613 4856 3265 2183 1603
08-20 64° 70° 6658 4891 3289 2199 1615
08-21 62° 74° 6703 4927 3315 2217 1628
08-22 55° 82° 6750 4963 3342 2236 1641
08-23 64° 78° 6799 5002 3371 2257 1657
08-24 55° 75° 6842 5035 3393 2271 1667
08-25 52° 67° 6879 5063 3411 2281 1671
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
08-26 48° 69° 6916 5089 3427 2289 1675
08-27 47° 74° 6954 5117 3446 2300 1680
08-28 53° 68° 6992 5146 3464 2310 1686
08-29 47° 65° 7027 5170 3479 2317 1687
08-30 44° 72° 7063 5196 3495 2325 1690
08-31 46° 75° 7102 5225 3513 2335 1696
09-01 49° 78° 7143 5256 3535 2349 1704
09-02 49° 79° 7185 5288 3557 2363 1713
09-03 53° 80° 7230 5323 3581 2379 1725
09-04 51° 65° 7266 5349 3598 2388 1728
09-05 46° 70° 7302 5375 3614 2396 1731
09-06 50° 63° 7336 5400 3628 2402 1733
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-07 42° 67° 7369 5422 3640 2406 1733
09-08 42° 69° 7402 5446 3654 2412 1733
09-09 46° 75° 7441 5474 3672 2422 1738
09-10 51° 78° 7483 5506 3695 2437 1748
09-11 51° 79° 7526 5539 3717 2451 1758
09-12 51° 80° 7569 5572 3741 2467 1768
09-13 55° 78° 7614 5607 3766 2484 1780
09-14 51° 82° 7658 5641 3790 2500 1791
09-15 55° 82° 7705 5678 3816 2518 1805
09-16 53° 83° 7751 5714 3842 2536 1818
09-17 52° 83° 7796 5749 3868 2554 1830
09-18 55° 86° 7845 5788 3897 2575 1846
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55
09-19 62° 79° 7893 5826 3925 2595 1861
09-20 55° 78° 7938 5861 3949 2611 1872
09-21 57° 70° 7979 5892 3971 2625 1881
09-22 61° 75° 8025 5929 3997 2643 1894
09-23 60° 73° 8070 5963 4021 2659 1906
09-24 62° 74° 8116 5999 4047 2677 1918
09-25 61° 75° 8162 6035 4073 2695 1931
09-26 54° 80° 8207 6070 4098 2712 1943
09-27 54° 85° 8254 6107 4126 2732 1958
09-28 60° 81° 8303 6146 4154 2752 1973
09-29 50° 83° 8347 6180 4179 2769 1985
09-30 51° 81° 8391 6214 4203 2785 1996
2025Lo
(F)		Hi
(F)		GDD
22		GDD
32		GDD
42		GDD
50		GDD
55

 

Latest Updates

February 16th, 2026Welcome to the 2026 GDD Tracking Season

Although Punxsutawney Phil saw his shadow predicting six more weeks of winter, GDDTracker will start counting on February 15. Spring is when GDDTracker receives the most attention for alerting turfgrass managers of optimal application timing windows for suppressing annual bluegrass seedheads and crabgrass preemergence applications. As spring turns to summer, there are several models that may be helpful throughout the season including the early season dollar spot DMI timer and the Smith-Kerns dollar spot prediction model. To learn about all the available models, click on the "About" tab at the top of the screen. Thanks for your continued support and use of GDDTracker and best wishes for a successful 2026!


 

March 18th, 2024Timing crabgrass preemergence applications in spring

Don't miss this update from from Kevin Frank regarding timing of crabgrass preemergence herbicides.


 

 

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