Understanding weed biology. Chuck Mohler Cornell University
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1 Understanding weed biology Chuck Mohler Cornell University
2 Outline Intro - what is a weed, types of weeds Perennial weeds Types of perennial weeds Cutting up perennials Weed seeds Germination cues Season of germination Seed longevity in the soil Seed size Seed production Seed dispersal Conclusions
3 Weeds are plants that thrive in disturbed environments For example, in a farm field Our crops are mostly annual plants - they live for one season We kill off natural vegetation & disturb the soil to make conditions suitable for crops But this also creates habitats for weeds
4 Understanding the biology of weeds is a key to their control Killing the weeds without harming your crops depends on the biological differences between the weeds and crops.
5 Types of perennial weeds Stationary Taprooted -- dandelion Fibrous rooted -- plantain Wandering Bulb -- nutsedge Shallow storage organ -- quackgrass Deep storage organ -- bindweeds
6 Common bindweed Broadleaf plantain Yellow nutsedge
7 Stationary perennials Mostly a problem of hay fields and pastures Usually not competitive the first year Easily eliminated by tillage Establish from seed Control in adjacent habitats
8 Wandering perennials Spread by thickened storage roots or by rhizomes (underground stems)
9 Apical dominance in perennials Tillage
10 Annual weeds Live less than one year Establish from seed each year Seeds/seedlings are critical stages
11 Seeds of most weeds are tiny The plant has limited resources Disturbed environments are risky Tiny seeds spread the risk over many offspring Seedlings can be small because in a recently disturbed environment, competition is limited.
12 0.4 Velvetleaf Lambsquarters Redroot pigweed Small seeded species only emerge if near the soil surface Depth (cm)
13 Germination cues Seedlings compete poorly with established plants So weed seeds need to know when other plants are absent Respond to cues associated with absence of plants Near-surface conditions soil disturbance
14 Light promotes germination of most weed species % Germination Species Light Dark Redroot pigweed Annual bluegrass 89 1 Purslane 28 12
15 Common purslane Redroot pigweed
16 Warm temperatures Redroot pigweed Location 68 F 95 F New York 6 93 N. Dakota Minnesota
17 Day/night temperature fluctuation %Germination Species +Fluct. -Fluct Chickweed Curlydock 100 0
18 Curly dock Common chickweed
19 Response to chemical environment Absence of volatiles (like ethanol and acetone) velvetleaf Presence of nitrate Lambsquarters
20 Velvetleaf Lambsquarters
21 Consequences Can use tillage to flush seeds out of the soil But deep tillage will bring new seeds to the surface
22 50 Groundsel Chickweed Annual bluegrass Persian speedwell Sheapards purse Knotweed Lambsquarters Weeds emerge at different times of year 50 0 Wild buckwheat Mar. Apr. May June July Aug. Sep. Oct.
23 Seed dormancy Seeds shed from parent plant Primary innate dormancy No dormancy A wide range of environmental conditions allows germination Germination Seasonal changes in environment Conditional dormancy A narrow range of environmental conditions allows germination Secondary innate dormancy
24 Seed longevity Loss per year (%) Species Cultivated Uncultivated Lambsquarters 31 8 Annual bluegrass Common chickweed Common groundsel High 45
25 Crop seeds are mostly much larger than weed seeds
26 Large seeded species emerge better through mulch Proportion emerging Rye mulch (kg/m 2 ). Corn Redroot pigweed
27 Seed size controls growth rate Initial growth rate Rela tive growth rate See d wei ght Species (mg) (mg/d) (mg/mg/d) Lambsquarters Velve tlea f Cockle bur Sunflower Soybean
28 Seed production A big lambsquarters can produce 100,000 seeds / yr A big redroot pigweed can produce 250,000 seeds / yr
29 Hairy galinsoga, 40,000 seeds
30 Most seeds come from a few large Number of plants plants Redroot pigweed Seed production (seeds per plant)
31 Most agricultural weeds depend on humans for dispersal In feed grain -- velvetleaf In manure On tractor tires and tillage machinery On combines
32 Some key points Breaking up perennials promotes sprouting Tillage, surface conditions, and absence of plants stimulates germination Species have characteristic seasons Seeds often persist in the soil for many years; they die at a constant rate Produce many small seeds Seed size controls depth of emergence, ability to emerge through mulch, and growth rate It is easy to bring in new weed species
33 Opportunities for control Breaking up perennials increases sprouts but each sprout is weaker Can use cultivation to flush weeds out of the soil If seeds miss their annual opportunity, many may die before next year; more die with tillage The difference in seed size between crops and weeds provides opportunities for control Avoid seed production Guard against invasion of new weeds
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