Vol. 15â1961 - NorthEastern Weed Science Society
Vol. 15â1961 - NorthEastern Weed Science Society Vol. 15â1961 - NorthEastern Weed Science Society
422. Results and Discussion Data from both the growing and dormant seasons' experUnents were analyzed by the analysis of variance method. Even though the sites and density within plots were selected as uniformly as possible, variance still occurred among replications. Most of this variance could be attributed to the variety of species involved (tables 1 & 2). Under these conditions only trends could be recognized. An analysis of the data from the July experUnent (table 1) showed that significant differences occurred in the percentage of original stems alive of the oaks, maples, hickories, etc. (other species) •. The amines killed 27 percent more of the original stems than the TBAand ATAcombinations. There was a definite trend, although not significant, which showed that TDAand ATAcombinations controlled the resprouting of black locust, sassafras, and sumac (BL.S.&S. group) better than the amines. There was no significant difference between chemicals when all of the species were combined. Data from the dormant treatments in January (table 2) showed no statistically significant difference between chemicals or methods. However, there was a strong trend favoring the solI applications when both groups of woody plants were combined. The percentage of resprouting for both technical and formulated 2,4,5-T was slightly lower than 2,4~D + 2,4,5-T on other species, but not significantly different at the 5% level. The percentage of resprouting 1n the BL.S.&S. group for all three methods of applications was very high. Less than one percent of the original stems in January survived in the two groups of species (table 2). Dormant treatments in April (table 2) showed a statistically significant difference between the methods of application but not between chemicals. The broadcast basal and s011 method on the BL.S.&S. group showed 58 percent less resprouting than the stem broadcast and soil method and 66 percent less resprouting than the stem broadcast method. Similar differences were significant at the 1% level with the BL.S.&S. and other groups combined. Less than one percent of the original stems survived treatment for both groups of brush in April. Significance appeared at the 1%level between January and April tests in the other species indicating less overall resprouting in the April than in the January treatments. There was also a strong trend which showed a lower percentage of resprouting in the BL.S.&S. group with the broadcast basal and soil method in April than in January. In both January and April applications there were no significant differences between 2,4-D + 2,4,5-T and 2,4,5-T alone at the 5% level on black locust, sassafras, and sumac. The percentAge of resprouting of black locust) s8S&afras) and sumac was lower for July applications than for the best dormant season applications.
423. However, there was a much lower percentage of original stems of all species alive as a result of the dormant tests than for the July test. TBAand ATA combinations were only about SO percent effective in killing the original stems of other species. Soil applications were more effective in April than in January. Possible explanations for this are (1) the roots of the BL.5.&5. group were more actively growing in April than in January and (2) 2,4-D and 2,4,S-T could have been broken down in the soil in the January expertment before the roots were active enough to be affected. There was no statistically significant difference between dormant applications of 2,4-D + 2,4,S-T and 2,4,S-T alone on the BL.S.&S. group. Both technical and formulated 2,4,5-T exhibited a slightly lower percentage of resprouting on other species than did 2,4-D + 2,4,S-T but the difference was not statistically significant. The dormant broadcast basal and soil method of application was equal to or better than the overall dormant methods of application for all species. A possible explanation is that the unsprayed terminal buds of the trees in the basal treated method facilitated the movement of the herbicides into vital parts of the trees. Some advantages of the dormant broadcast application are: basal and soil method of (1) Less chemical is required for the control of woody plants, such as the oaks and maples, that do not exhibit the ability to sucker from underground parts. (2) Tall brush can be sprayed more easily. (3) Oil applications are much easier on the spray operators since the spray guns are seldom pointed upward thereby reducing spray drift. These results show definite trends, but in order to be more conclusive resprouting counts should be made again ~£ter the second growing season. _.'
- Page 372 and 373: 372. On spring plowed plots I where
- Page 374 and 375: Table 1. Treat.ments Used and Stand
- Page 376 and 377: 37t. PRELIMINARYRESULTSONTHE CONTRO
- Page 378 and 379: 378. CHEMICAL TREATMENTS FORTHECONT
- Page 380 and 381: Table ;. Visual RatiDgs and Stand C
- Page 382 and 383: ANN11AL WEEDCONTROL IN SILAGECORN1
- Page 384 and 385: TABLEI. field Corn tiead Control an
- Page 386 and 387: Sunderiand,' Mass..Experiment: In t
- Page 388 and 389: ) ) BBLB I. QuackgT88S Control in F
- Page 390 and 391: TABLEIII. Quackgr888 Control in Fie
- Page 392 and 393: 392. herbicides. In senerel."we.had
- Page 394 and 395: 394. RESULTS§e PISCUSSION In Augus
- Page 396 and 397: 396. WHATHAPPENS TO PHENOXYHERBICID
- Page 398 and 399: D. TASTEAND ODORSTUDIES Taste and o
- Page 400 and 401: herbicides produces aquantit.at.ive
- Page 402 and 403: 4('2. • A DECADEOF BRUSHCONl'ROL
- Page 404 and 405: areas, fre1.uently the crews l'UIrL
- Page 406 and 407: 406. During June and July 1959 a pr
- Page 408 and 409: 408. Numerous chemicals have been u
- Page 410 and 411: " A Progress Report on Urab * Brush
- Page 412 and 413: 412.
- Page 414 and 415: 414. Urab is an effective chemical
- Page 416 and 417: 416. application. Atrazine has a wa
- Page 418 and 419: 418. COMPARISONOF TECHNIQUESANDSPEC
- Page 420 and 421: Table I - Results of chemicals appl
- Page 424 and 425: 424. THE CONNECTICUT ARBORETUM RIGH
- Page 426 and 427: 426. (Kalmia angustifolia) ,huckleb
- Page 428 and 429: 42$. TABLEI (cont'd.) Technique For
- Page 430 and 431: 43". by Leonard and Crafts (15) mos
- Page 432 and 433: 432. awareness of the need for good
- Page 434 and 435: 434. RECOMMENDAT:I"'NS FOR THE USE
- Page 436 and 437: 436. The recommended materials for
- Page 438 and 439: 438. NATURALANDSCAJ:'ING WITHHERBIC
- Page 440 and 441: 440. STATEHIGHWAYHERBICIDE POLICIES
- Page 442 and 443: 442. There is a matter of judgment
- Page 444 and 445: 444. DATAON STATEHIGHWAYHERBICIDE P
- Page 446 and 447: 446. ROADSIDEBRUSHCONTROLWIM PHENOX
- Page 448 and 449: 446. Spraying begins in Connecticut
- Page 450 and 451: Basal applications can be applied e
- Page 452 and 453: 452. UMASSACHUSETTS PROGRESSREPORTO
- Page 454 and 455: 45,4. Again, since the solution is
- Page 456 and 457: 456. Statistics In 1959, the low bi
- Page 458 and 459: 458. formation of seed heads. It wa
- Page 460 and 461: 460. In our northern division, we c
- Page 462 and 463: 462. '. 1. A. 200 ga'l Lons of' wat
- Page 464 and 465: METHODSOF SMIJPLING RAG.hfEED POLLS
- Page 466 and 467: counted. ThJ grqins m~y ba st~inad
- Page 468 and 469: 468. slide moved across the orifi~e
- Page 470 and 471: 470. INTERIMREPORTONAQUATICWEEDCONT
423.<br />
However, there was a much lower percentage of original stems of all species<br />
alive as a result of the dormant tests than for the July test. TBAand ATA<br />
combinations were only about SO percent effective in killing the original<br />
stems of other species.<br />
Soil applications were more effective in April than in January.<br />
Possible explanations for this are (1) the roots of the BL.5.&5. group were<br />
more actively growing in April than in January and (2) 2,4-D and 2,4,S-T<br />
could have been broken down in the soil in the January expertment before<br />
the roots were active enough to be affected.<br />
There was no statistically significant difference between dormant<br />
applications of 2,4-D + 2,4,S-T and 2,4,S-T alone on the BL.S.&S. group.<br />
Both technical and formulated 2,4,5-T exhibited a slightly lower percentage<br />
of resprouting on other species than did 2,4-D + 2,4,S-T but the<br />
difference was not statistically significant.<br />
The dormant broadcast basal and soil method of application was equal<br />
to or better than the overall dormant methods of application for all species.<br />
A possible explanation is that the unsprayed terminal buds of the trees in<br />
the basal treated method facilitated the movement of the herbicides into<br />
vital parts of the trees.<br />
Some advantages of the dormant broadcast<br />
application are:<br />
basal and soil method of<br />
(1) Less chemical is required for the control of woody plants,<br />
such as the oaks and maples, that do not exhibit the ability to sucker from<br />
underground parts.<br />
(2) Tall brush can be sprayed more easily.<br />
(3) Oil applications are much easier on the spray operators<br />
since the spray guns are seldom pointed upward thereby reducing spray drift.<br />
These results show definite trends, but in order to be more conclusive<br />
resprouting counts should be made again ~£ter the second growing season.<br />
_.'
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