-3-


Post emergence to celery and weeds in the field


 Karsil (NIA 4562) has controlled emerged annual seedling weeds
in celery fields at up to 3 or 4 weeks after setting. Initially, celery may be
stunted slightly and become slightly chlorotic; however, recovery is prompt and
at harvest check and treated plants have not differed significantly in number
or length of petioles or in yield. Maturity of treated plots may be delayed
from 3 to 5 days and consequently cause a slight retardation in crates per acre
yield. Time of harvest trials are currently underway. Karsil is an experimental
herbicide currently not available commercially. Evaluation data are given in
Table 4 and Table 5.

 Table 4. Average evaluation data for post emergence herbicidal
 treatments in three celery varieties at three locations. Treat-
 ment rates are active material per acre.


Herbicidal treatment


Karsil, 3 Ib.
 4 lb.


Karsil, 3 Ib +
 Vegadex, 3 lb.

Mineral spirits
 50 cpa

Mineral spirits
 50 gpa + Vegadex,
 3 Ib.

Check, handweeded


Percent control of
Grass B'leaf Sedge


94-72
94-81


97-75
94-94


100
100


Celery
tolerance


97%
96


97-94 100-97 100

81-75 81-25 72


 Yield
crates/acre


897
852


917


94 75
- -


100


930


Table 5. Average yields for commercial trials with Karsil post
emergence herbicide applied to four celery varieties at eight
locations.


Herbicidal treatment

Karsil
Karsil + Vegadex
Farm check


Average yields,
6 locations

 585
 581
 628


crates/acre
 2 locations

 628
 643
 644