Vol. 15â1961 - NorthEastern Weed Science Society
Vol. 15â1961 - NorthEastern Weed Science Society Vol. 15â1961 - NorthEastern Weed Science Society
3e, r-ever-s e was evident at the high rate. It would probably b co difficult to es tablish the significance of this on the basis of thes e.data lone, but the same trend existed in several preliminary, tests using a numbe of different concentrations of both wetting agents from O. 01 to O. 5 perce t. Surface tension measurem ents showed that at 0.2% in the spray solution, Tergitol TMN reduced surface tension more than did Polyglycol 26-2, whi eat concentrations of 0.05% and less the reverse was true. This may indica e that penetration (as affected by surface tension) is a major factor influenc'ng the results obtained. A study of the amount of dalapon translocated into the new rhizom es shows that although the amounts accumulated Incr-eas ed whth added wetting agent, there was a slight decrease in the percentage of t nslocated dalapon which moved to the rhizem es, This also would tend to support the hypothesis . that the surface active agent influenced penetration mor-e han translocation and that Whatever conditions limit the transport of dalapo -2-C 14 into a rhtzom e still appeared to be lim iting even when wetting a ents are us ed in the form ulatton, Second, significant amounts of dalapont..2-C 14 werie translocated through the rhizome to untreated shoots. Not all shoots ~an be equally well covered by a field spray, and a number of quackgrass sh~ots are normally connected by rhizomes. The transport of dalapon from Oile shoot to another through the rhizome section may tend to equalize a less t an perfect spray application •. In these experiments, as little as 0.0.5% of non-Ionic wetting agent in the spray solution increased the movement of daapon-2-C 14 into an untreated shoot by nearly 50%, .whfle 0.2% in the spray s~lution increased movern ent into an untreated shoot by nearly 100%. l' . Movement into new rhizomes. followed the same p ttern, with the addition of O. 05% wetting agent resulting in more than sotGincrease in accuof C 14-dalapon, while the addition of O. 2% w etttng agent resulted mulation in at least four times the accumulation of radioactivity o*ained with formulations containing no wetting agent. Movement of dalapon-2-C 14 into the leaves w~s i~creased more by the addition of wetting agents than movement into and th~~ugh the rhizom es# but it is felt that these movements (into rhizomes and through rhizomes to untreated shoots) may be critical in evaluating the herbiclidal effectiveness of dalapon on quackgrass.
39. SUMMARY Tests using 2-C 14-1abelled dalapon form ulations with and without non-ionic wetting agents resulted in a definite increase in the amount of dalapon-2-C 14 recovered from rhizomes, untreated shoots and leaves. These increases in the amount of dalapon translocated were measured on uniform plants under conditions which avoided such variables as differences in leaf area covered by droplets of equal volume but with different surface tensions and differences in the amount of formulation applied per plant resulting from the influence of the wetting agent in retention of the form ulation by the leaf. Erratic results have been obtained from time to time in field applications of dalapon, These tests, conducted under controlled conditions with uniform plants. emphasize the. importance of adequate foliage wetting. It is felt that the wetting agent is. needed to wet the water, not the chemical, hence all concentrations reported here were percentages of the spray volume.
- Page 1 and 2: THE USE OF VEGETATIVECHARACTERISTIC
- Page 3 and 4: In a few grasses with smooth sheath
- Page 5 and 6: 5. FACTORSINFLUEUCINGTHE PERFORFANC
- Page 7 and 8: 7. The introduction of synthetic or
- Page 9 and 10: The com;onents the distribution of
- Page 11 and 12: grains. We early found that the oat
- Page 13 and 14: 13. Atrazine Days following cpm/O.
- Page 15 and 16: 15. not find an abundant production
- Page 17 and 18: Weed Control In Suburbia 1 Howard H
- Page 19 and 20: For establishing new lawns, I would
- Page 21 and 22: Any improvement that you can make i
- Page 23 and 24: PROMISINGNEWCHEMICALSFORWEEDCONTROL
- Page 25 and 26: 25. Promis ins results have also be
- Page 27 and 28: 27. (Lycbnis alba), cinquefoil (Pot
- Page 29 and 30: THE EFFECTS OF ADDED PENETRANT AIDS
- Page 31 and 32: ... Surfactant Produced bz: . 31
- Page 33 and 34: 33. 33. of scintillation solution,
- Page 35 and 36: Table 3. The Net Counts Per Minute
- Page 37: The comparisons for lower leaves, s
- Page 41 and 42: 41. RECENTDEVELOPMENTS IN THEUSE OF
- Page 43 and 44: second application be made not late
- Page 45 and 46: 45. Combinations of vegadex-Randox
- Page 47 and 48: 11/ Persistence of Soil-Incorporate
- Page 49 and 50: Plot size varied from 9 sq. ft. to
- Page 51 and 52: Lower rates of R-1856 were tested o
- Page 53 and 54: greenhouse tests are listed below.
- Page 55 and 56: PROGRESSREPORTON LAY-BYUEEDCONTROLI
- Page 57 and 58: 57. Table 1. Effect of sodium silic
- Page 59 and 60: Sheets (1959) studied, under labora
- Page 61 and 62: M, ',. • • •• • " ' Treat
- Page 63 and 64: Figure 1. Relative performance trea
- Page 65 and 66: A duplicate test was started August
- Page 67 and 68: 67. "he two tests which dealt with
- Page 69 and 70: 69. CONTROLOF WEEDSIN VEGETABLECROP
- Page 71 and 72: 71.' TABLE 3. RESPONSE OF VEGETABLE
- Page 73 and 74: 73. COHBIltit.TloNS' OF cnu:'PITH C
- Page 75 and 76: 75. Results The delay in applicatio
- Page 77 and 78: 77. Summary Logarithmic, tank-mixed
- Page 79 and 80: (' ( ( Table 1 Rates and Dates of H
- Page 81 and 82: ( ( ( Table 3 Effect of Post-Tran~l
- Page 83 and 84: ( ( ( Table 5 Effect of Lay-By Herb
- Page 85 and 86: Chemical Weed Control Charles J. No
- Page 87 and 88: Table I. Weed control, plant stand,
39.<br />
SUMMARY<br />
Tests using 2-C 14-1abelled dalapon form ulations with and without<br />
non-ionic wetting agents resulted in a definite increase in the amount of<br />
dalapon-2-C 14 recovered from rhizomes, untreated shoots and leaves. These<br />
increases in the amount of dalapon translocated were measured on uniform<br />
plants under conditions which avoided such variables as differences in leaf<br />
area covered by droplets of equal volume but with different surface tensions<br />
and differences in the amount of formulation applied per plant resulting from<br />
the influence of the wetting agent in retention of the form ulation by the leaf.<br />
Erratic results have been obtained from time to time in field applications<br />
of dalapon, These tests, conducted under controlled conditions with<br />
uniform plants. emphasize the. importance of adequate foliage wetting. It is<br />
felt that the wetting agent is. needed to wet the water, not the chemical,<br />
hence all concentrations reported here were percentages of the spray volume.
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