Vol. 15—1961 - NorthEastern Weed Science Society

CommonName
WEEDSCONTROLLED ANDAQUATHOL DOSAGE RATECHART
Entire Pond Spot Or
Or Lal'ge kea Lake Margin
Latin Name
Treatment
Treatment
Horned Pondweed Zannichellia spp. 1-2 ppm 2-3 ppm
Coontail Ceratophyllum spp. 1-2 ppm 2-3 ppm
Water StargTass Heteranthea app. 2-3 ppm 3-4 ppm
MilfoU Myriophyllum app. 2-3 ppm 3-4 ppm
Bushy Pondweed
Naias spp , .5-1.5 ppm 2-3 ppm
Potamogeton americanus 2-3 ppm 3-4 ppm
Bassweed Potamegeton amplifo1ius 2-3 ppm '3-4 ppm
Curly Leaf Pondweed Potamogeton crispus ;S-L5 ppm 2-3 ppm
Potamegeton diversl£olius 1-2 ppm 2-3 ppm
Potamegeton filiform1s 2-3 ppm 3-4 ppm
Floating-Leaf Pondweed Potamegeton natans 1-2 ppm . 2-3 ppm
Potamogeton pusi11u8 1-2 PPDl . 2-3 ppm
Sago Pondweed Potamogeton pectinatuB 1-2 ppm 2-3 ppm
Flat-Stem Pondweed Potamegaton zosteriformis 2,-3 ppm 3-4 ppm
Burr Weed Sparganium spp , 3-4 ppm 4-5 ppm
Duckweed Wolffia, Spirodela, Surface contact spray at
Lemoa, spp. the,rate of 5 gallons liquid
IfAquath01fiper acre
Discussion
of Results
In consideration of tests in 1960, the following points should be weighed in
evaluation of "Aquathol" as an aquatic herbicide:
1. UAquathoP' is a contact action herbicide and it h.s pr.oven necessary
to apply sufficient IAquatho1" to the area treate4 to maintain a
given strength of ac.ti,ve "ingredient in the water 8urTounding the
exposed tissue surface area of.t,he plant.
2. Aquatic plants appear easier to kill in their more vigorous, earlier
growing stage than in late summer after maturity, so it appears necessary.t~
,treat after a growth has developed in spring or early
summer;. after water temperatures have reached a consistent 62-650F.;
and before seeding, where seeding 1s the normal .thad of reproduction.
"Aquatho 1" does not apP'ea~ adaptable for the control of weeds in
extremely cold waters. '
3. The active ingredient in IIAquatbol" fo~mulat1on~ is water soluble and
diffusesreadilx and rapidly in water; therefore, it is necessary to
use a rate appr~priate to the nature of the area treated. Spot
treatments and marginal treatments of large bodies of water require
higher rates. "Aquathol" does not appear adaptable to bodies of
water where there 1s a great deal of water movement.