Vol. 15—1961 - NorthEastern Weed Science Society

286.
20. Halts F-29 8%lytron )
21.. I:alts F-20a 4%Dactha1 » ht Scott's S,reader
) ,Setting 10.
22.· Check
!faults
~ Discussion
Table I shows the results obtained with the ,various chemicals used in this
ex,eriment. All rates of application referred to below are on the acre basis.
1-13489 at the 40 pound rate -gave.99 percent .control. The· 30 and 20 pound
rates gave about 90 percen~ control.
1-3186;4 gave 99, '96 and 90 percent'control 'for 20, 10 and 5pound rates
respectively. No discoltlratiott lias noted.'·' ...
1-34314 at the 20 and 10 pound rat~B produced 'very good control but the
basic turfgrass was 'reduced by 97 and 95 percent. Discoloration was severe
right after application~ lAt the 5 pound rate discoloration was moderate, permanent
~jury was 50 percent and control only 64 percent.
Dacthal at 15, 10 and 5 pounds gave excellent control. i~o discoloration
was noted for any of the rates but a slight decrease in turf was noted at the
15 pound rate. .,
Zytron ~~-1329 gave exce11,ent control at the 20 ,and 10 pound rates. Some
discoloration lias noted at the heavier'rate.
Zytron ~r-1662 resulted in 100 percent control at the 20 pound rate and 88
percent at the 10 pound rate.
Niagara 5996 was not effective
at either the 2 or 4 pound rate.
The alO tricalcium arsenates, Chi, Cal and (GC) T.C.A. at the 508 pound
rate ~roduced 100 percent control. Chip Cal discolored the basic grass very
slightly. "
House­
ioo percent control was obtained with no crab at a 370 pound rate.
eared chickweed was strikingly bleached and killed with this chemical.
Di-metP-~CT at 344 pounds produced '96 percent control.
Chlordane at 60 pounds gave 15 percent control.
Chlordane + DS}~resulted
in 82 percent control.
Chlordane 05-201 at 30 pounds gave 37 percent control whereas 15 and 7.S
pounds resulted in no control. there was no discoloration or injury with any
of the chlordane materials.