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Lecture 02 2010 - Weed Biology 1 PLS 176 Winter 2010 Weed...

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Weed Biology 1 PLS 176 Winter 2010
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Weed Biology life cycles methods of reproduction mating systems/genetics seed production seed dispersal soil seed bank seed germination seed dormancy
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A weed’s life cycle determines what kinds of cropping situations the weed might be a problem in and what management methods are likely to succeed. annuals, biennials, and perennials Life Cycle
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1.Annuals From germination to seed in one year or less Grow fast, lots of seed early Spread by seed, soil seed bank is a problem Early colonizers, ruderals, typical crop weeds
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b. winter annuals Fall emergence, winter as rosette, in spring they grow & set seed Often have summer dormancy Problem in fall-seeded crops a.summer annuals Emerge in spring, grow in summer, seed in fall Usually most troublesome Problem in summer crops
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Summer Annuals – Broadleaf Weeds Amaranthus retroflexus, redroot pigweed Chenopodium album , lambsquarters Xanthium strumarium cocklebur
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