Impacts of inorganic turbidity on diquat efficacy against Egeria densa

Poovey, A.G. and Getsinger, K.D. (2002) Impacts of inorganic turbidity on diquat efficacy against Egeria densa. Journal of Aquatic Plant Management, 40, pp. 6-10.

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In clear water, diquat [6,7-dihydrodipyrido (1,2-1a:2',1'-c) pyrazinediium dibromide] provides excellent submersed Plant control at low concentrations, such as <0.5 mg active ingredient (ai) L-1: however. turbid water conditions can interfere with the activity and effectiveness of this herbicide. Little work has been done to examine what ranges of turbidity caused by different Suspended sediment types affect diquat efficacy against a target species. A growth chamber study was conducted rising diquat against the submersed macrophyte -egeria (Egeria densa Planch.) under a range Of turbid conditions. Two materials were used to create turbid beater conditions: 100% bentonite clay for a "worst-case" scenario and a natural partial-clav (20% clay). Results indicated that a high rate of diquat (2 mg ai L-1) controlled egeria under relatively low levels of turbidity (5-10 NTU) using bentonite clay: however. higher levels (25 to 50 NTU) of turbidity essentially blocked effectiveness of diquat when applied at all rates tested (0.5. 1, 2 mg ai L-1). When using a natural partial-clay sediment, rates of 1 to 2 mg ai L-1 diquat provided good control of egeria in moderately turbid water (15 NTU). Additional evaluations rising different clay types would be useful to determine the effect of inorganic turbidity oil diquat efficacy.

Item Type: Article
Title: Impacts of inorganic turbidity on diquat efficacy against Egeria densa
Personal Creator/Author:
Poovey, A.G.
Getsinger, K.D.
Journal or Publication Title: Journal of Aquatic Plant Management
Volume: 40
Page Range: pp. 6-10
Date: 2002
Uncontrolled Keywords: Suspended clay, colloidal particles, Brazilian elodea, Reward®
Subjects: Biology
Item ID: 1744
Depositing User: Sciences Librarian Peter Fritzler
Date Deposited: 21 Nov 2008 23:19
Last Modified: 29 Sep 2011 20:09

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