Aquatic Weed Identification and Control
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1 Aquatic Weed Identification and Control David Kratville, Environmental Scientist Integrated Pest Control Branch California Department of Food and Agriculture
2 Emergent/Floating Aquatic Weed ID Riparian Submersed
3 Potamogetons: broad vs narrow leaves
4 Aquatic Weed ID American Pondweed,Potamogeton nodosus
5 Aquatic Weed ID Leafy Pondweed, Potamogeton foliosus
6 Curlyleaf Pondweed, P. crispus Non-native
7 Aquatic Weed ID Curlyleaf Pondweed, Potamogeton crispus
8 Aquatic Weed ID Eurasian Watermilfoil, Myriophyllum spicatum
9 Aquatic Weed ID Eurasian Watermilfoil, Myriophyllum spicatum Note minor branches all come off single axis, and unbranched. Robust stems, often red.
10 Aquatic Weed ID Parrotfeather, Myriophyllum aquaticum Non-native Locally a severe pest, in still-water situations Distinctive above-surface foliage Attractive
11 Aquatic Weed ID Parrotfeather, Myriophyllum aquaticum
12 Aquatic Weed ID Parrotfeather, Myriophyllum aquaticum
13 Aquatic Weed ID Parrotfeather, Myriophyllum aquaticum
14 Aquatic Weed ID Carolina Fanwort, Cabomba caroliniana Non-native, relatively recent Becoming common and a pest in Delta
15 Aquatic Weed ID Carolina Fanwort, Cabomba caroliniana Note that minor branches themselves have branches, unlike watermilfoil
16 Aquatic Weed ID Carolina Fanwort, Cabomba caroliniana
17 Aquatic Weed ID Submersed plants with whorls of single leaves Highly variable!
18 Aquatic Weed ID Hydrilla, Hydrilla verticilata
19 Aquatic Weed ID Hydrilla, Hydrilla verticillata
20 Aquatic Weed ID Hydrilla, Hydrilla verticillata HIGHLY VARIABLE!
21 Aquatic Weed ID Hydrilla
22 Aquatic Weed ID Hydrilla, Hydrilla verticillata
23 Foothill pond 6-10 deep Aquatic Weed ID Hydrilla, Hydrilla verticillata
24 Aquatic Weed ID Egeria, Egeria densa
25 Aquatic Weed ID Egeria, Egeria densa
26 Aquatic Weed ID Egeria, Egeria densa
27 Aquatic Weed ID Egeria, Egeria densa
28 Aquatic Weed ID Alligatorweed, Alternanthera philoxeroides Non-native Rare at present Under eradication Extremely hard to kill Leaves opposite White flowers Found for the first time in Northern California 2017!
29 Aquatic Weed ID Alligatorweed, Alternanthera philoxeroides
30 Aquatic Weed ID Alligatorweed, Alternathera philoxeroides
31 Aquatic Weed ID Alligatorweed, Alternathera philoxeroides
32 Aquatic Weed ID Alligatorweed, Alternathera philoxeroides
33 Aquatic Weed ID Water Hyacinth, Eichornia crassipes
34 Aquatic Weed ID Water Hyacinth, Eichornia crassipes
35 Aquatic Weed ID Smooth Frogbit, Limnobium laevigatum Similar leaf outline to hyacinth, but plant generally smaller Most leaves are thickened or keeled, and with crisp, spongy-foamy layer that provides floatation In hyacinth, floatation is in stems
36 Aquatic Weed ID Smooth Frogbit, Limnobium laevigatum spongeplant hyacinth
37 Aquatic Weed ID Smooth Frogbit, Limnobium laevigatum
38 Aquatic Weed ID Smooth Frogbit, Limnobium laevigatum
39 Giant Salvinia, Salvinia molesta
40 G Giant Salvinia can form dense populations in water storage and delivery systems. Heavy infestations slow water movement, destroy pumps, kill fish and encourage mosquito populations.
41 Aquatic Weed ID Yellowflag Iris, Iris pseudacorus
42 Aquatic Weed ID Yellowflag Iris, Iris pseudacorus
43 Aquatic Weed ID Yellowflag Iris, Iris pseudacorus
44 Control Methods
45 Control Efforts Mechanical Harvesters
46 Control Efforts Fragmentation
47 Control Efforts
48 Control Efforts
49 Control Efforts
50 Control Efforts
51 Control Efforts
52 Control Efforts Biological Control
53 Control Efforts Biological Control, Leaf-eating Beetle (Galerucella, sp.) Adult Larva
54 Control Efforts Plants skeletonized by Leaf-eating Beetle (Galerucella, sp.)
55 Control Efforts Biological Control Agents Established in Shasta County August, 2002 August, 2004
56 Control Efforts Biological control agent collection.
57 Control Efforts Biological control agent collection.
58 Control Efforts Other Biological Control Agents Root-boring Weevil, Hylobius transversovittatus Seedhead Weevil, Nanophyes marmoratus
59 Control Efforts
60 Chemical Control
61 Chemical Control
62 Chemical Control
63 Tubers, turions and fragments
64 Chemical Control
65 Chemical Control
66 Chemical Control
67 Chemical Control
68 Chemical Control
69 Tuber Production
70 Low Water
71 Chemical Control
72 Reduce Tuber Bank
73 Full Pool Protected Tubers Sprout
74 Chemical Control
75 Chemical Control
76 NPDES Talent Irrigation District. US EPA Memorandum Interpretive Statement on Application of Pesticides to Waters of the United States in Compliance with FIFRA. CDFA continuing water monitoring under NPDES permit.
77 Thank you
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