Vol. 15â1961 - NorthEastern Weed Science Society
Vol. 15â1961 - NorthEastern Weed Science Society Vol. 15â1961 - NorthEastern Weed Science Society
ANN11AL WEEDCONTROL IN SILAGECORN1 Jonas Ve.r1s 2 ~is ia a proaresa report of work done in 1960 with herbicides for the control of alUlual weeds in field corD. The main objective of these trial. was to compare the effectiveDas. of triazines and other new herbicides with Dinltro and 2.4.D. Procedure: The experiment was conducted on a Hoe sandy loam with fair uaioaae. A randomized block deslan with three replicates was used. Bach plot conaisted of four coru rows 25 ft. lona. The seedbed was prepared aD.April 28 and 29. Bleven dE:ys later on May 10 pre-plantt. treatments (Table I) were applied aDd immediately worked into the 80il by rototill1D& 4-6 in. deep. Twodays later on May 12, Ohio M-15 field corn was planted. Pre-emergence treatments were applied on the followina day. At this time some small annual weed seed!in&a had already emerged. Therefore. the pre-emergence treatments should be considered at least partially a8 post-emergence treatments. In the RaQdox4 Ib/A + 2.4-0 1/2 Ib/A treatment. Randox was applied as a pre-emeraenee treatment on May 13. and 2.4-D applied on June 10 as a post-emerlence treatment. At that time corn was approximately 7 inches hiah. Whenmaking the pce-plantina and pce-emet'pace treatments. the 1011 was moist. Within a week more t'aln showers occut'red so that weather conditions foc the treatments wece quite favor.ble. Thece was no cultivation duciDI the Icowing season. The effect of diffeceDt treatments 00 weeds and cern was observed throushout the growina senson. The weed populativn in the order of their relative freqcency was m~C:e up of the folll)w~.ua species: Lambs quarters (Chenopodiumalbum). old witch grass (Paoleum capillare). barnyard arass (EchlDochloa Crus-aalli), pigweed (AmacaDthusretroflexus), crabara8s (Digitacla sanguinalis) and carpet weed (Mollugo verticl11ata). All herbicide cates presented in Table I ace expressed in pounds of acid equivalent oc active in&cedient per acce. Rasults and Discussion: Obsel:Vations made ten weeks after planting ace recorded in Table I. All treatments effectively controlled dicotyledoneous weeds. With the exception of 1/2 Ib/A of 2,4-D as a post-emergence treatment. all hecblcldes at the rates applied also controlled grassy weeds. 2,4-D applied as a liquid was moce effective in controlling broadleaved weeds and also weedy grasses than 2.4-D in 8~anulated form. Randox this year was not as 1. Contclbutlon No. 1281 of t!le Univec.ity of Massachusetts, College of Agricultuce, Expec~ent Station. Amher3t, Massachusetts. 2. Assistant Profe&8or of Agronomy, University of Massacbusetta, Amheclt, Maosachuaetta.
effective a8'1n1959 (1). This could possibly be due to the relatively long interval between .eedbed preparation and material application. Weed seedlings in evidence at the time of the Randox applications were not controlled. Once more, the 1960 tests showed that it is sound practice to apply DNBPat emergence or immediately after the emergence of field corn. EPTAMgave excellent control of grassy weeds but broadleaved weed control was significantly poorer. In general, the best annual .weedcontr~l in our field tests was obtained by triazine treatments. Wedid not get significant differences between rates, time of application or form of material (Atrazine or Simazine). This is probably due to the satisfactory soil moisture i conditions throughout the growing season. Mixing Atrazine and Simazine with the 80il immediately after application did not increase their effectiVJ!l,ness. One is inclined to postulate that under dry soil conditions mixing should . provide better weed control. Cpd. B, as well as Fenac, performed wallin.t controlling annual weeds but both herbicides caused injury to corn, especially at the 4 Ib/A rate. Summaryand Conclusions: 1. A weed control experiment witb field corn was conducted on a fine sandy loam soil. Hine different herbicides at various rates and times of application were used. Corn was planted on moist soU and within a week following the application of pre-emergence treatment, about one inch of rain fell. The weed population consisted of: lambs quarters. old witch sra •• , barnyard grass, pigweed, crabgrass And carpet-weed. 2. All chemicals were effective in contTolling broadleaved weeds. With the exception of 2,4-D, 1/2 Ib/A post-emergence application, all herbicides effectively controlled grassy weeds also. The best weed control was obtained with Atrazine and Simazine. UndeT the soil moisture conditions which prevailed as little as one Ib/A of Atrazine ~r Simazine gave good annual weed control in field corn. Applying triazines before planting and' immediately mixing 4-5 in. deep with the so~J .lIlas not superior to the pre-emergence applications. Feuac and ('pd. 'B'gava a very good weed control but corn injury was significant. EPTAM4 l~'A and 6 lb/Arates stunted corn for six weeks. Later on the, corn regained uormal appearance and yields were significantly higher than the checks. Referencee: 1. Vengris, Jonas. Weed Control in Field Corn. Proceedings 14th Annual HEWCC,pp. 367-369. 1960.
- Page 332 and 333: 332, Figure -I. Chromatogram of qua
- Page 334 and 335: 334. PRELIMINARYRESULTSONTHE USE OF
- Page 336 and 337: 336. DATEOF BERRYHARVESTAS IT AFFEC
- Page 338 and 339: within three inches of the soIl sur
- Page 340 and 341: 340 .. The growth ra.te of Horse ne
- Page 342 and 343: 342. dish containing ten seeds bet\
- Page 344 and 345: 344. is not a factor in in It is
- Page 346 and 347: 346 • .Absornt:j.Qn Qn Exchange R
- Page 348 and 349: 348. The' chrona tog ram."WaS first
- Page 350 and 351: 350. PROGRESSREPORTON A STUDYOF THE
- Page 352 and 353: 352. 7. Fluctuating warm and cold w
- Page 354 and 355: 354. A clos.e correlation was found
- Page 356 and 357: 356. 1 THE ANATOMICAL NATUREO:BTHE
- Page 358 and 359: 358. The 2,4,5-TP was most effectiv
- Page 360 and 361: Table I. Effect. of Pre-emergence T
- Page 362 and 363: INTRODUCIIOB: THEEFFECTOF WEEDCOMPE
- Page 364 and 365: 1";. 1958 JFab1e I (cont ' d) Treat
- Page 366 and 367: 366. fiE USE OF FENACFOR QUACKGRASS
- Page 368 and 369: 36$. SUMMARY: Based on a I).umber o
- Page 370 and 371: - Table 1. Chemicals and Rates Used
- Page 372 and 373: 372. On spring plowed plots I where
- Page 374 and 375: Table 1. Treat.ments Used and Stand
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- Page 378 and 379: 378. CHEMICAL TREATMENTS FORTHECONT
- Page 380 and 381: Table ;. Visual RatiDgs and Stand C
- Page 384 and 385: TABLEI. field Corn tiead Control an
- Page 386 and 387: Sunderiand,' Mass..Experiment: In t
- Page 388 and 389: ) ) BBLB I. QuackgT88S Control in F
- Page 390 and 391: TABLEIII. Quackgr888 Control in Fie
- Page 392 and 393: 392. herbicides. In senerel."we.had
- Page 394 and 395: 394. RESULTS§e PISCUSSION In Augus
- Page 396 and 397: 396. WHATHAPPENS TO PHENOXYHERBICID
- Page 398 and 399: D. TASTEAND ODORSTUDIES Taste and o
- Page 400 and 401: herbicides produces aquantit.at.ive
- Page 402 and 403: 4('2. • A DECADEOF BRUSHCONl'ROL
- Page 404 and 405: areas, fre1.uently the crews l'UIrL
- Page 406 and 407: 406. During June and July 1959 a pr
- Page 408 and 409: 408. Numerous chemicals have been u
- Page 410 and 411: " A Progress Report on Urab * Brush
- Page 412 and 413: 412.
- Page 414 and 415: 414. Urab is an effective chemical
- Page 416 and 417: 416. application. Atrazine has a wa
- Page 418 and 419: 418. COMPARISONOF TECHNIQUESANDSPEC
- Page 420 and 421: Table I - Results of chemicals appl
- Page 422 and 423: 422. Results and Discussion Data fr
- Page 424 and 425: 424. THE CONNECTICUT ARBORETUM RIGH
- Page 426 and 427: 426. (Kalmia angustifolia) ,huckleb
- Page 428 and 429: 42$. TABLEI (cont'd.) Technique For
- Page 430 and 431: 43". by Leonard and Crafts (15) mos
ANN11AL WEEDCONTROL IN SILAGECORN1<br />
Jonas Ve.r1s 2<br />
~is ia a proaresa report of work done in 1960 with herbicides for<br />
the control of alUlual weeds in field corD. The main objective of these<br />
trial. was to compare the effectiveDas. of triazines and other new herbicides<br />
with Dinltro and 2.4.D.<br />
Procedure:<br />
The experiment was conducted on a Hoe sandy loam with fair uaioaae.<br />
A randomized block deslan with three replicates was used. Bach plot conaisted<br />
of four coru rows 25 ft. lona. The seedbed was prepared aD.April 28<br />
and 29. Bleven dE:ys later on May 10 pre-plantt. treatments (Table I) were<br />
applied aDd immediately worked into the 80il by rototill1D& 4-6 in. deep.<br />
Twodays later on May 12, Ohio M-15 field corn was planted. Pre-emergence<br />
treatments were applied on the followina day. At this time some small<br />
annual weed seed!in&a had already emerged. Therefore. the pre-emergence<br />
treatments should be considered at least partially a8 post-emergence treatments.<br />
In the RaQdox4 Ib/A + 2.4-0 1/2 Ib/A treatment. Randox was applied<br />
as a pre-emeraenee treatment on May 13. and 2.4-D applied on June 10 as a<br />
post-emerlence treatment. At that time corn was approximately 7 inches hiah.<br />
Whenmaking the pce-plantina and pce-emet'pace treatments. the 1011 was<br />
moist. Within a week more t'aln showers occut'red so that weather conditions<br />
foc the treatments wece quite favor.ble. Thece was no cultivation duciDI<br />
the Icowing season.<br />
The effect of diffeceDt treatments 00 weeds and cern was observed<br />
throushout the growina senson. The weed populativn in the order of their<br />
relative freqcency was m~C:e up of the folll)w~.ua species: Lambs quarters<br />
(Chenopodiumalbum). old witch grass (Paoleum capillare). barnyard arass<br />
(EchlDochloa Crus-aalli), pigweed (AmacaDthusretroflexus), crabara8s<br />
(Digitacla sanguinalis) and carpet weed (Mollugo verticl11ata).<br />
All herbicide cates presented in Table I ace expressed in pounds of<br />
acid equivalent oc active in&cedient per acce.<br />
Rasults and Discussion:<br />
Obsel:Vations made ten weeks after planting ace recorded in Table I.<br />
All treatments effectively controlled dicotyledoneous weeds. With the<br />
exception of 1/2 Ib/A of 2,4-D as a post-emergence treatment. all hecblcldes<br />
at the rates applied also controlled grassy weeds. 2,4-D applied as a<br />
liquid was moce effective in controlling broadleaved weeds and also weedy<br />
grasses than 2.4-D in 8~anulated form. Randox this year was not as<br />
1. Contclbutlon No. 1281 of t!le Univec.ity of Massachusetts, College of<br />
Agricultuce, Expec~ent Station. Amher3t, Massachusetts.<br />
2. Assistant Profe&8or of Agronomy, University of Massacbusetta, Amheclt,<br />
Maosachuaetta.
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