Vol. 16—1962 - NorthEastern Weed Science Society

Some damage to runners rssul ted frOlll'the high application rate 0 Postemergence
treatments with 5 lb/A gave good control of weeds in cucumbers,
cantaloupes, watermelons, and squash. Post-emergence treatments at lay-by
- after clean cultivation would seem prOlllising. This herbicide appears to
remain herbicidally active in the soil for extended periods, a characteristic
which should be noted.
25
Du Pont 326 - E. I.
emPont de Nemours Company
The pre-emergence or directed post-emergence application of Du Pont .}26
(3-(3,4-dichlorophenyl)-1-methoxy-l-methylurea) gave good weed control in a
number of field and horticultural crops.
Field corn, oats, safflower,soybeans, and Sudallgrass tolerated 1-2 lb/A
as a pre-emergence spray whereas ·lIIOaJtbroadleaved aadgtl'assy annual weeds wers
controlled by application of 1/2 lb/A. This herbicide also looks promisiDg
for the pre-emergence control of annual weeds in sweet corn and carrots.
As a directed post-emergence spray, Du Pont 326. reportedly looks good for
weed control in corn ·and cotton at rates of 3/4-3 lb/A. Some oontact injury
to the lower leaves of corn has been reported butthia was short-lived.
HPC7531 - Hercules
Powder Company
Limited trials show that the HPC7531 is extremely active at 4 1b/A on
most crops and weeds as a pre- or post-emergence treatment. Peas, sorghum,
and Sudangrass show limited tolerance to pre-emergence treatments. When
used as a post-emergence treatment, 4-8 lb/A of HPC7531 acted as a Boil
sterilant.
HS-55 - Badische Ana1in and Soda Fabrik
HS-55 is a combination of n-cyc1oocty1 dimethy1urea and butyny1 N-(3
-chloropheny1) carbamate. As a pre-emergence spray at a rate of 4 1b/A or
less HS-55 may be useful for the control of a number of annual weeds in corn,
lima beans, and sugar beets. At application rates of 8 1b/A or more HS-55
acts as a soil sterilant.
Ago
NFM5778 and NFM2995 - Niagara Chemical Division,
FMC
Pre-emergence applications of NFM5778 (4,6-dinitro-2-sec-buty1phenol
acetate) at rates of 6-8 1b/A are promising for control of annual broad1eaved
and grassy weeds in field and sweet corn, cotton, peanuts, peas, snapbeans,
and soybeans. Few crops show tolerance to over-all post-emergence treatments.
Pre·-emergence applications of NFM2995 (methyl !!-(3,4-dichloropheny1)­
carbamate) appear promising for weed control in field corn, cotton, peanuts,
soybeans, Sudangrass, sweet corn, lima beans, and snapbeans. These crops
tolerated 3 1b/A without visible injury. Annual broadleaved and grassy weeds
were controlled by 1 lb/A or less. Anover-all post-emergence spray caused