Vol. 15—1961 - NorthEastern Weed Science Society

PROGRESSREPORT'ON WEEDCONTROL IN CARROTSAND SQUASH
. .
le5.
M.F.'I'revett
and. Wi::'.iam Gardner!!
mRORUCTIOH
.. This.pape~11s a ,repl:>.rt'oq.. the ,ettect,iveness ot certain
herbicides listed.in Table It1n,~ontroll1ng annual broadleat weeds
.'in Golden Delicious squash. and in Chantenay carrots.
Procedure
. Treatments were replicated six times in randomized blooks
of single row plots paired with Untreated plots. Sprays we e
applied with a single pass o£ a small plot sprayer at 40 pc mds
pressure and 50 gallons per aCre volume. All plots were o~ltivated
throughout the season, but during oultivation the' soil was not
disturbed six inches Qn either.side ot the orop row.
The prinoipal broadleat weeds in the carrot blocks were:
Lambsquarters (ChenopodlWMalbum L.), Shepherd's Purse (Capsella
'-' Bursa-pastoris L.), and FoxtaIl (Setaria spp.).
The prinoipal broadleat we:-edin the squash block was Lambsquarters~
A. Carrots.
Results
. Ten pounds per acre of Zytron applied ,pre-emergence resulted
in si~1ficantlyhlgher yieldsot car~ots than pre-emergenoe
application of 2 or 4 pounds ot Amiben, or 4 pounds of granular
CIPC, Table 2. Ten pounds o£ Zytron did not differ" significantly
in etfect on yield trom4 or 8 pounds of D6cthal,~pplied preemergence,
ortrom 4 pou~ds of Karsl1 applied po~t-emergence.
Four pounds of Trieta~ine resulted in yields.$lgniticantly lower
than all other treatments except cheek. '
Highest yields were, in general, associated wit~;treatments
that ranked numerically high tor both.number ot carrots per plot
and weight p&r carrot, Table 1. ,Statistically, however, in the
pre-emergence block, Zytron,·Pscthal, Karsil, and Amiben did not
11 Associate Agronomy and Technical Assistant, agronomy Ddpartmant,
University of Maine, Orono, Maine.