Vol. 15—1961 - NorthEastern Weed Science Society

182.
Progress Report. on Lay-By WeedControi:of
Potatoes l
. R. L. Sawyer and S. L. Dallyn
This repOrt is a c6nti~uation of work included in previous proceedings
concerning chemicals applied to Hpotatoes to control the weeds"Which become a·
problem after last cultivation.
Material~aE_d_ Methods: All materials were applied in granular form using a Noble
applicator. Plots were three rows wide and 30 feet long,
replicated four times. Thirty-two check plots were randomized through the
experiment, the average being given in table 1. Rye was sown as a grass weed
crop on June 21 and the Eptam plots treated before the last cultivation. The
remaining chemicals listed in table 1 were applied to Katahdin potatoes on June
23 after the last cultivation. Potatoes were harvested on September 7.
Results and Discussion: Atrazine at both the two and four pound rates gave
foliage burns and decreased the yield of potatoes.
Karmex also gave slight foliage burn and a yield reduction.
The rye crop seeded for weed control determination
and no results in weed control ability were obtained.
gave a very poor stand
Table 1. Chemicals applied as· granular form for lay-by weed control with potatoes.
Active Rate Bu./A. Specific
~~~~~~! !~~:L~~ !!~!~ ~:~Y~~l-
Eptam 2 694 1.055
Eptam 4 f:JJ9 1.060
Simazin 4 621 1.057
Falone 4 . 694 1.062 MeanSquares
Karmex DW 3/4 489 1.054 ---------------
DaLapcn Ml50l 1 643 1.060 Bu./A. Specific
Dalapon M1501 3 611 1,063 §2Yr£2 ~ X!~l~ 9~~!!~~
Alanap 3 639 1.062 Replication 3 204.0 44.33
Amiben 2 665 ~.063
Treatments 19 659.0 28.68
Amiben 4 651 1.063 Error 57 265.3 27.CIJ
Atrazine 2 200 1.047
Atrazine 4 136 i.055
Check 669 1.060
1·
Long Island Vegetable Research Farm~ Cornell University, Riverhead, N. Y.
Paper No. 446, Department of Vegetable C~ops, Cornell University, Ithaca, N. Y.