CSS302-Lecture5 - 2 Water flooding 3 Animals domestic and...

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Four Processes of Reproduction of Weeds A. Seed Production B. Dissemination of Seed C. Germination of Seed D. Vegetative Reproduction
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Four Processes of Reproduction of Weeds A.  Seed Production B. Dissemination of Seed C. Germination of Seed D. Vegetative Reproduction
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A. Seed Production Common Name # Seeds/Plant Yellow Nutsedge Pennsylvania Smartweed Barnyardgrass Giant Foxtail Common Ragweed Velvetleaf Jimsonweed Shepherd’s Purse Curly Dock Common Purslane Common Lambsquarters Redroot Pigweed Eastern Black Nightshade Source: Ross & Lembi, Applied Weed Science
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B. Dissemination of Seed 1. Wind ( structural modifications ) Winged seeds – expanded seed margin: Curled Dock b. Parachutes -  feather-like attachments  (________):                                        -long silky hair-like attachments:
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B. Dissemination of Seed
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Unformatted text preview: 2. Water - flooding 3. Animals ( domestic and wild ) a. Digestive tract - ____________________ b. Hair or fleece – _____________________ B. Dissemination of Seed 4. Human Activity a. Sold in crop seed - __________________ b. Carried on equipment – ______________ C. Germination of Weed Seed 1. Conditions necessary for germination: Always required – ______________ – ______________ – ______________ Often Required – ______________ Light Requirement for Germination ■ Present in many weed species ■ In general : – Small-seeded weeds - sensitive to light – Large-seeded weeds - not sensitive to light ■ Ecological importance: – Indicates ________________________________ – Indicates ________________________________ ■ Involves phytochrome...
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This note was uploaded on 10/28/2010 for the course CSS CSS302 taught by Professor Jimkells during the Fall '08 term at Michigan State University.

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CSS302-Lecture5 - 2 Water flooding 3 Animals domestic and...

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