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Unit 9: Alfalfa Insects

Unit 9: Alfalfa Insects. Unit 9: Alfalfa Insects. Alfalfa Weevil Found throughout the U.S. Damage done by larvae feeding on plant tips, new leaves, flowers Can strip the entire plant Damaged fields can appear whitish in color Insecticides can control effectively

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Unit 9: Alfalfa Insects

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  1. Unit 9: Alfalfa Insects

  2. Unit 9: Alfalfa Insects • Alfalfa Weevil • Found throughout the U.S. • Damage done by larvae feeding on plant tips, new leaves, flowers • Can strip the entire plant • Damaged fields can appear whitish in color • Insecticides can control effectively • Be cautious of withdrawal and cutting times

  3. Unit 9: Alfalfa Insects • Ideal conditions • Early first harvest • Weevil feed on new growth coming for 2nd cutting • Crown buds • Can severely limit growth • Late harvest • Feeds on regrowth • Can damage crop before going into dormancy • Can make crop more susceptible to winterkill

  4. Unit 9: Alfalfa Insects • Potato Leafhopper • Feeds by puncturing the leaves • Causes yellowing of the plant • Usually not a problem w/ 1st cut alfalfa due to life cycle • Can break cycle by cutting • Leafhopper must have supply of succulent food to survive • Can be very damaging to new seedings • Very susceptible to insecticides, some resistant varieties

  5. Unit 9: Alfalfa Insects • Alfalfa Seed Chalcid • Can cause extensive damage to the seedling • Adult deposits an egg on a developing seedling • Hatched larvae can devour the entire seedling • Several generations/season • Late fall larvae overwinter in seeds and can reinfest the next crop • Mow/treat road ditches and perimeter for help w/ control

  6. Unit 9: Alfalfa Insects • Heavy cleaning of seed alfalfa eliminates most problems • Bug harbors inside seed • Lighter weight seeds are removed

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