YOUTH & AGRICULTURE FAMILIES HEALTH ECONOMY ENVIRONMENT ENERGY COMMUNITIES. Session 1: Biology of Weeds
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1 YOUTH & AGRICULTURE FAMILIES HEALTH ECONOMY ENVIRONMENT ENERGY COMMUNITIES Session 1: Biology of Weeds
2 What Is A Weed?
3 What is a Weed? A plant that is: Competitive Invasive Persistent Pernicious Interferes with what we want to do with the land
4 Weed Characteristics Usually widely adapted Rapid emergence and growth Quick to reproduce itself Produces lots of seeds Seeds disperse widely Many seeds are dormant
5 How Do We Classify a Weed? By its origin (where a plant is from) By its morphology (what a plant looks like) By its life cycle (how a plant reproduces)
6 Why Control Weeds? Unwanted competition to grape plants Don t stay in one place, but can move through the vineyard(s) Can harbor insect and disease pests May pose a health hazard to humans Panicle Willowweed
7 Weed Origins Native Introduced Escaped
8 Weed Origins Native Introduced Escaped
9 Weed Origins Native Introduced Escaped
10 Most Weeds Are Not Native Holm s World s Worst Weeds Continent Number of Species Europe 25 Central/South America 17 Asia 14 Africa 11 Cosmopolitan 5 North America 4
11 Two Major Plant Types Morphologically Monocotyledons Dicotyledons One seed leaf Two seed leaves Nearly all plant Grasses, sedges, families (and most lilies, etc. the weeds)
12 Two Major Plant Types Morphologically Monocotyledons Dicotyledons One seed leaf Two seed leaves Nearly all plant Grasses, sedges, families (and most lilies, etc. the weeds)
13 Two Major Plant Types Morphologically Monocotyledons Dicotyledons One seed leaf Two seed leaves Nearly all plant Grasses, sedges, families (and most lilies, etc. the weeds)
14 Life Cycles Of Weeds Annuals Biennials Perennials
15 Life Cycle: Annuals
16 Life Cycle Of Annuals SPRING germinate FALL vegetative growth WINTER SUMMER flower set seed SPRING FALL Summer Annuals die SUMMER Winter Annuals
17 Life Cycle Of Annuals SPRING germinate FALL vegetative growth WINTER SUMMER flower set seed SPRING FALL Summer Annuals die SUMMER Winter Annuals
18 Winter Annuals Common Chickweed Western Bittercress Henbit Common Groundsel
19 Winter Annuals Common Chickweed Western Bittercress Henbit Common Groundsel
20 Winter Annuals Common Chickweed Western Bittercress Henbit Common Groundsel
21 Winter Annuals Common Chickweed Western Bittercress Henbit Common Groundsel
22 Life Cycle Winter Annuals Fall Winter Spring Summer Germination
23 Life Cycle Winter Annuals Fall Winter Spring Summer Vegetative Growth
24 Life Cycle Winter Annuals Fall Winter Spring Summer Flowering
25 Life Cycle Winter Annuals Fall Winter Spring Summer Seed Set
26 Life Cycle Winter Annuals Fall Winter Spring Summer Death
27 Summer Annuals Common Lambsquarters Barnyardgrass Smartweed Pigweed
28 Summer Annuals Common Lambsquarters Barnyardgrass Smartweed Pigweed
29 Summer Annuals Common Lambsquarters Barnyardgrass Smartweed Pigweed
30 Summer Annuals Common Lambsquarters Barnyardgrass Smartweed Pigweed
31 Life Cycle Summer Annuals Spring Summer Fall Winter Germination
32 Life Cycle Summer Annuals Spring Summer Fall Winter Vegetative Growth
33 Life Cycle Summer Annuals Spring Summer Fall Winter Flowering
34 Life Cycle Summer Annuals Spring Summer Fall Winter Seed Set and Death
35 Question: When is the best time to control annual weeds?
36 Question: When is the best time to control annual weeds? Answer: When they re small!
37 Annual Weed Control
38 Life Cycle: Biennials
39 12 MONTHS Life Cycle Of Biennials FALL germinate WINTER vegetative growth rosette SPRING flower set seed 2 nd Year SUMMER Winter Annuals die Biennials
40 12 MONTHS Life Cycle Of Biennials FALL germinate WINTER vegetative growth rosette SPRING flower set seed 2 nd Year SUMMER Winter Annuals die Biennials
41 Biennials Common Mullein Common Burdock Bull Thistle Tansy Ragwort
42 Biennials Common Mullein Common Burdock Bull Thistle Tansy Ragwort
43 Biennials Common Mullein Common Burdock Bull Thistle Tansy Ragwort
44 Biennials Common Mullein Common Burdock Bull Thistle Tansy Ragwort
45 Life Cycle Biennials First Year Second Year Summer Winter Spring Summer Germination
46 Life Cycle Biennials First Year Second Year Summer Winter Spring Summer Vegetative Growth
47 Life Cycle Biennials First Year Second Year Summer Winter Spring Summer Rosette
48 Life Cycle Biennials First Year Second Year Summer Winter Spring Summer Flower
49 Life Cycle Biennials First Year Second Year Summer Winter Spring Summer Seed Set
50 Life Cycle Biennials First Year Second Year Summer Winter Spring Summer Death
51 Question: When is the best time to control biennial weeds?
52 Question: When is the best time to control biennial weeds? Answer: When they re small!
53 Biennial Weed Control
54 Life Cycle: Perennials
55 Life Cycle Of Perennials germinate vegetative growth, regrowth 1 st Year 2 nd Year, 3 rd, 4 th flower set seed Die (?)
56 Life Cycle Of Perennials germinate vegetative growth, regrowth 1 st Year 2 nd Year, 3 rd, 4 th flower set seed Die (?)
57 Life Cycle Of Perennials
58 Simple Perennials Dandelion Broadleaf Dock Broadleaf Plantain Scotch Broom
59 Simple Perennials Dandelion Broadleaf Dock Broadleaf Plantain Scotch Broom
60 Simple Perennials Dandelion Broadleaf Dock Broadleaf Plantain Scotch Broom
61 Simple Perennials Dandelion Broadleaf Dock Broadleaf Plantain Scotch Broom
62 Life Cycle Simple Perennials First Year Every following year Germination
63 Life Cycle Simple Perennials First Year Every following year Vegetative Growth and Regrowth
64 Life Cycle Simple Perennials First Year Every following year Flowering and Seed Set
65 Life Cycle Simple Perennials First Year Every following year Summer and Fall Regrowth
66 Creeping Perennials Canada Thistle Quackgrass Field Bindweed Creeping Buttercup
67 Creeping Perennials Canada Thistle Quackgrass Field Bindweed Creeping Buttercup
68 Creeping Perennials Canada Thistle Quackgrass Field Bindweed Creeping Buttercup
69 Creeping Perennials Canada Thistle Quackgrass Field Bindweed Creeping Buttercup
70 Life Cycle Creeping Perennials Every Year Vegetative Regrowth from Roots
71 Life Cycle Creeping Perennials Flowering and Seed Set Every Year
72 Question: When is the best time to control perennial weeds?
73 Question: When is the best time to control perennial weeds? Answer: When they re small!...and later...
74 Perennial Weed Control
75 The Next Weed Session Session 1: Biology of Weeds Session 2: Weed Reproduction Session 3: Non-chemical Weed Management Session 4: Chemical Weed Management
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