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Control Studies

A Review of the 2004 Connecticut Department of Environmental Protection Pesticide Permits

    A review of the more than 500 pesticide permits approved in 2004 by the Connecticut Department of Environmental Protection for treatment of aquatic plants found that the species treated most frequently were algae, which were cited a total of 697 times. Filamentous algae alone appeared on 294 applications.

    Among flowering plants, plants in the Lemnaceae family were cited on many applications – 360 for watermeal and 289 for duckweeds.

    Pondweeds (Potamogeton spp.) were cited on 350 applications, which included 47 applications for treatment of curly leaf pondweed, an invasive plant in Connecticut (other pondweeds are native plants). Water lilies, which are native species in Connecticut, were cited on 87 applications.

Frequency with which aquatic plants are cited as reasons for pesticide application, based on a review of DEP permits issued for 2004 (N = 556 applications).

Algae

697

Angiosperms

Filamentous

294

Watermeal

360

Charaphytes

46

Duckweeds

289

Blue-greens

11

Pondweeds

350

Unicellular

11

Curly-leaf pondweed

47

Water lilies

87

Milfoil spp.

71

Ceratophyllum spp.

57

Elodea spp.

52

Vallisneria americana

10

Najas spp.

33

Brasenia schreberi

20

Cabomba caroliniana

4