UGA HORT 2000 - HORT Oct 20 (3 pages)

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HORT Oct 20



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HORT Oct 20

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Pages:
3
School:
University of Georgia
Course:
Hort 2000 - Hort Science
Hort Science Documents

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Hort 10 20 Plant pests organisms that compete with people for food or otherwise interfere with raising of horticulture crops Five main groups of pests weeds invertebrates vertebrates disease agents man Classis pest control strategy identify understand life cycle evaluate damage or effects control Cultural practices proper plant selection o plant selection o adaptability o host resistance maintain good plant health timing o diseases get worst at the end of season sanitation Plant selection is important hardiness zone 8a in Athens o any plant you plant hardiness zone is VERY important shade vs sun o if a plant is exposed to 6 8 hours of sunlight its perfect amount soil moisture tolerance o wet natured o poor drainage o drought prone Mechanical controls machines devices traps Chemical controls traditional chemical organic o not persistent o often plant derived o biological pesticides Pest icides Herbicides weeds Insecticides insects Fungicides fungi Bactericides bacteria Rodenticides rodents Pesticide toxicity Measured in LD50 o The LD50 is the dose that kills half 50 of the animals tested LD lethal dose o Measured in mg per kg body weight Examples of LD50 of common pesticides o Acephate orthene 980 o Aspartame 10 000 o Insecticidal soap 16 900 o Bacillus thuringiensis 15 000 o Roundup glyphosate 3750 o DDT chlorinated hydrocarbon 87 o Aspirin 1750 o Caffeine 292 Do you have what it takes Weeds are efficient because o Early germination o Rapid seeding growth o Large leaf area o Massive root systems Weeds Most weeds produce large of seeds o Broadleaf plantain 36 000 o Crabgrass 53 000 o Annual bluegrass 2 000 Some weed seeds remain dormant for 20 years before germinating o Hard seed coat How weeds hurt Competition space light Appearance factors Harbor insects and plant diseases Some are poisonous Dulls mower blades Allelopathy Weed biology Weeds are classified as o Annuals summer and winter o Biennials o Perennials warm season cool season



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