Vol. 15—1961 - NorthEastern Weed Science Society

164.
The averase number of ruDDer pJ.ants formed per ori&1ftal plant set
(Table 3) 1fU low in the non-hoed oheck, Casoron, and Karsil followed by
Ka.rsil plus S1maZ1ne treatments with 2.4, 3.4, and 5.7 runner plants per
original pl8Z1t, respectively. Treatment 6 - Simazi:n.e follcrwed by Karsil ­
and treatment 2 - Eptam followed by Kareil plus S1mazine - had 12.5 and
11.'7 runner plants, respectively. All other treatments were s1mila.r to
the check - 9.5.
Plant observations throughout the season did not reveal any marked
plant injury although occasional leaves in plots receiving both Karsil
and Simazine had small amounts ot chlorosis.
The most commonbroad-leaved. weeds in the non-hoed check plots and
in the border around the strawberry planting were: redroot pigweed,
purslane., ragweed, lambsquarters, and smartweed. Most commongrasses were:
sprea.d1ng witch, crab, and barnyard. By the end at August, redroot
pigweed plants in the non-hoed check plots were otten .4to 6 feet
tall 'While spreading witch grass was 3 to 4. feet tall. In the non-hoed
checks, caeoron, and Da.cthal plus S1mazine plots, the grasses and broadleaved
weeds were so dense that the entire plots were oavered and the
strawberry plants were shaded. The summary at the principal weeds in the
plots just before they were pu1].ed and weighed in late August to early
September is given in Table 4.
By using certain combinations of herbicides during the past season,
more specifically between June 20 and September 1, it was possible to
keep the str""wberry planting free tram serious weed. com.petition without
appreciable injury to strawberry plants. No attempt was made to use
herbicides before June 20 this season because weeds can be controlled
until then without much detailed hand weeding and more strawberry plant
injury might occur from the earlier application. The success at these
herbicide combinations may also have been largely due to the lack of
soil disturbance. If the soil 1s cultivated or mixed additional weed
seeds may be placed 1n a favorable environment for growth. The herbicides
may be relocated where they will not control weeds as well or even be mor'6d
nearer certain plant roots and cause plant injury.