Vol. 15â1961 - NorthEastern Weed Science Society
Vol. 15â1961 - NorthEastern Weed Science Society Vol. 15â1961 - NorthEastern Weed Science Society
474. taste and odor problems. The absence of phenols was indicated in the tests conducted in two o~ the laboratories using the same method rOt analysis, while a third laboratory using a different me~hod ot analysis tound phenols present in some ot the samples. Other investigators have reported similar discrepancies, having used various methods ot analysis. It is strongly recommended that a standard procedure be developed which can be relied upon tor an accurate result. In,. the bacteriological analyses it was noted that after an application of, the herbicide, the bacterial count as well as the number of colitorms increased and then gradually deoreased in the ensuing weeks. Discussions with other analysts indicated that similar results were obtained on other treated lakes, several theories were advanced, but little value or no conclusion can be attaohed to them. Some interest in t~is pbenomena was shown by micro-biologists and when the opportunity o~a similar oondition presents itself, a more thorough and comprehensive analysis will be made. Atter studying the results ot the analyses and prior to having the phenol determinations from the third laboratory, permission was gr.(lnted, .eo treat the lower lake which overflows direotly Intothe water-supply reservoir. This lower lake was smaller, having an area ot 33 acres, and an average depth ot 4.6 teet. It was much more heaVily infested with woeds with milfoil again predominating, but with considerable potomogetian robinsii. In view of the fish kill experienced on the upper lake the property owner:'. request called tor a dosage ot only :ll p.p.m. and this lake,t.houghsmal~r.l'as to be treated in 3 sections With a longer dela,. between treatments. In spite 01' the decreased dosage a very satistactory weed kill was aocomplished. The sampling program established tor this lake was in creased to inolude daily samples for dissolved oxygen deter mina:t ion.. The reason tor this was to try to establish a relationship between the time atter dosage and the dissolved oxygsn ccnoentIl'ation to see it the absence ot oxygen could ha'V'. been a f'actor in the tish kill. In eaoh section treated, atter the dissolved oxygen began decreasing the results were upset by rainfall which increased the d1.ss01ved 0X7gen oontent. However, there was no kill ot tish in thislakB. In spite ot the reduced Silver concentration and the
heavier weed growth the physical properties of the water; color, turbidity and odor, remained nearly the same as that experienced in the upper lake. The conclusions which may be drawn from this experimen work are s tal CONCLUSIONS 475. 1.. The surface of the lake should be drawn down below the spillway a sufficient amount to give a month~s detention time before refilling. By knowing the size of the watershed above the lake, the normal runoff per square mile for a particular season and the long range weather outlook, it is possible to make an accurate prediction. It is necessary to insure a month's time before overflow's~nce it was found that odors from the vehicle in which the weedicide is dissolved can persist for as long as 3 weeks. 2. Experienced applicators are necessary, therefore the state should institute a program to examine and license qualified applicants. From the water purveyor's standpoint the applicator should be responsible for adVising the lake owner that he is located on a potable watershed and, therefore, permissions must be secured before treatment can be started. He must be capable of adding chemicals to obtain given concentrations trom area and depth maps prepared by him or acceptable to him. 3. The lake must be divided into a number of sections for treatment to safeguard against possible fish kill. The number will be dependent upon the size of the lake and the dens i ty of the weeds. 4. The chemical manufacturers must take a more active part in experimental work to show that their chemicals will not contribute to the degradation of the quality of potable waters. The water purveyor is Willing to cooperate but he is not equipped to perform the necessary laboratory work required to check each and every chemical offered for weed control pur~ poses. Today the manufacturer checks the tOXicity of some weedicides. Let him increase these tests to include the detrimental effects on the physical, bacteriological and chemical properties of the water. This will enable the water purveyor to select the chemical which would be the least deleterious to his particular supply. It will also enable the State Department of Health to prepare a list of acceptable chemicals for use on watersheds for potable waters.
- Page 424 and 425: 424. THE CONNECTICUT ARBORETUM RIGH
- Page 426 and 427: 426. (Kalmia angustifolia) ,huckleb
- Page 428 and 429: 42$. TABLEI (cont'd.) Technique For
- Page 430 and 431: 43". by Leonard and Crafts (15) mos
- Page 432 and 433: 432. awareness of the need for good
- Page 434 and 435: 434. RECOMMENDAT:I"'NS FOR THE USE
- Page 436 and 437: 436. The recommended materials for
- Page 438 and 439: 438. NATURALANDSCAJ:'ING WITHHERBIC
- Page 440 and 441: 440. STATEHIGHWAYHERBICIDE POLICIES
- Page 442 and 443: 442. There is a matter of judgment
- Page 444 and 445: 444. DATAON STATEHIGHWAYHERBICIDE P
- Page 446 and 447: 446. ROADSIDEBRUSHCONTROLWIM PHENOX
- Page 448 and 449: 446. Spraying begins in Connecticut
- Page 450 and 451: Basal applications can be applied e
- Page 452 and 453: 452. UMASSACHUSETTS PROGRESSREPORTO
- Page 454 and 455: 45,4. Again, since the solution is
- Page 456 and 457: 456. Statistics In 1959, the low bi
- Page 458 and 459: 458. formation of seed heads. It wa
- Page 460 and 461: 460. In our northern division, we c
- Page 462 and 463: 462. '. 1. A. 200 ga'l Lons of' wat
- Page 464 and 465: METHODSOF SMIJPLING RAG.hfEED POLLS
- Page 466 and 467: counted. ThJ grqins m~y ba st~inad
- Page 468 and 469: 468. slide moved across the orifi~e
- Page 470 and 471: 470. INTERIMREPORTONAQUATICWEEDCONT
- Page 472 and 473: ,.' f'inal retJuJ.t was that the us
- Page 476 and 477: 476. AQUATIC'J1ElID.CONTJ3.,OL '65~
- Page 478 and 479: 478. For example: Imagine, if you:
- Page 480 and 481: enefit of those both us1ng the wate
- Page 482 and 483: • • of ,-, "",jqc. '\:':' ',:,;
- Page 484 and 485: ~ '. r; I ' ':'.' ~, ',;' '.'. 1·"
- Page 486 and 487: 486. weeds increased the food 4.3 t
- Page 488 and 489: ..; . " .," .. ,', oontro..lbe ·oo
- Page 490 and 491: 490. Idee1ly these woUld coVer' foo
- Page 492 and 493: 4')2. Literatm-o Cit~: Biolog:$,cal
- Page 494 and 495: 494. SYSt.:Clil ..:ne sp:aying cont
- Page 496 and 497: 496. 0ll'l;ljing, &hluL ..l V,~l"Y
- Page 498 and 499: etween our sprayine=. operatdons an
- Page 500 and 501: 500. loblolly pine existed iii quat
- Page 502 and 503: 502. 'j' " Using results for all ou
- Page 504 and 505: cut over several year. ,b.elozoe.·
- Page 506 and 507: 506. HARJJ.rlOOD CONTROL WITHMIST B
- Page 508 and 509: 508. distance was achieved. All sub
- Page 510 and 511: 510. Hardwood oontrol within the li
- Page 512 and 513: • J ". 512. ~ ., and the weather
- Page 514 and 515: ) ) ) '.. . . hble). EffectbeneBB o
- Page 516 and 517: 516. HERBICIDf;TECHNIQUE.:> ,FORTn-
- Page 518 and 519: 518. The possibility o:rusing contr
- Page 520 and 521: 520 • . However, the capacity of
- Page 522 and 523: 522. This is followed by planting i
474.<br />
taste and odor problems. The absence of phenols was indicated<br />
in the tests conducted in two o~ the laboratories using<br />
the same method rOt analysis, while a third laboratory using a<br />
different me~hod ot analysis tound phenols present in some ot<br />
the samples. Other investigators have reported similar discrepancies,<br />
having used various methods ot analysis. It is<br />
strongly recommended that a standard procedure be developed<br />
which can be relied upon tor an accurate result.<br />
In,. the bacteriological analyses it was noted that after<br />
an application of, the herbicide, the bacterial count as well<br />
as the number of colitorms increased and then gradually deoreased<br />
in the ensuing weeks. Discussions with other analysts<br />
indicated that similar results were obtained on other<br />
treated lakes, several theories were advanced, but little<br />
value or no conclusion can be attaohed to them. Some interest<br />
in t~is pbenomena was shown by micro-biologists and when the<br />
opportunity o~a similar oondition presents itself, a more<br />
thorough and comprehensive analysis will be made.<br />
Atter studying the results ot the analyses and prior to<br />
having the phenol determinations from the third laboratory,<br />
permission was gr.(lnted, .eo treat the lower lake which overflows<br />
direotly Intothe water-supply reservoir.<br />
This lower lake was smaller, having an area ot 33 acres,<br />
and an average depth ot 4.6 teet. It was much more heaVily<br />
infested with woeds with milfoil again predominating, but<br />
with considerable potomogetian robinsii.<br />
In view of the fish kill experienced on the upper lake<br />
the property owner:'. request called tor a dosage ot only :ll<br />
p.p.m. and this lake,t.houghsmal~r.l'as to be treated in<br />
3 sections With a longer dela,. between treatments. In spite<br />
01' the decreased dosage a very satistactory weed kill was<br />
aocomplished.<br />
The sampling program established tor this lake was in<br />
creased to inolude daily samples for dissolved oxygen deter<br />
mina:t ion.. The reason tor this was to try to establish a<br />
relationship between the time atter dosage and the dissolved<br />
oxygsn ccnoentIl'ation to see it the absence ot oxygen could<br />
ha'V'. been a f'actor in the tish kill.<br />
In eaoh section treated, atter the dissolved oxygen<br />
began decreasing the results were upset by rainfall which increased<br />
the d1.ss01ved 0X7gen oontent. However, there was no<br />
kill ot tish in thislakB.<br />
In spite ot the reduced Silver concentration and the
Change language