Weed Control

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Across
  1. 3. points upward on the inner side of the leaf and resembles a continuation of the sheath where it joins the blade
  2. 5. is accomplished by people and the activities they carry out in producing and harvesting crops
  3. 9. are finger-like projections of the collar that extend around the shoot
  4. 12. lives for more than two growing seasons and may reproduce by seed and/or vegetative growth
  5. 14. seeds germinate in the late spring, and the plants actively grow during the summer months
  6. 16. the broadest part of a leaf
  7. 20. herbicide that will kill any plant it contacts
  8. 21. encloses the stem and is connected to the blade at the junction formed by the collar
  9. 23. herbicides that prevent any vegetation from growing for a period of months or years
  10. 26. applied before the weeds and/or crop emerges but after the crop has been seeded
  11. 28. are taken into the plant through the roots or leaves and moved to a sensitive area (e.g., a growing point or storage organ)
  12. 31. resemble grasses, but they are not susceptible to the same herbicides as grasses
  13. 32. a plant growing where it is not wanted or an out-of-place plant
  14. 33. are not moved within the plant; these herbicides simply kill the plant tissue with which they come in contact
  15. 34. have persistent above-ground stems that remain from season to season, although the leaves may die in autumn
Down
  1. 1. wider than the leaves of grass or grass-like weeds
  2. 2. located on the outer side of the leaf, forms the junction that connects the blade and sheath
  3. 4. provides a systematic program for determining the best management practices for weed control
  4. 6. is an interaction that has a negative effect on one organism while affecting the other organism very little
  5. 7. applied 10 to 30 days before seeding and may or may not be incorporated into the soil
  6. 8. applied after the crop and weeds have emerged from the soil
  7. 10. applied up to 10 days prior to seeding and is immediately incorporated because it will evaporate or be broken down by sunlight
  8. 11. seeds germinate in the fall, and the plants actively grow until late spring when they produce seeds.
  9. 13. injurious to crops, people, and livestock
  10. 15. the seedling leaves of the broadleaf plant
  11. 17. modified underground stems that produce new plants from the nodes
  12. 18. modified above-ground stems that grow horizontally over the ground
  13. 19. herbicide that will kill only certain types of plants
  14. 20. joints
  15. 22. die back to the ground each fall, but their root systems over-winter and the plants re-sprout the following spring from buds on the root systems
  16. 24. the movement of weeds by wind, water, and wildlife
  17. 25. is a plant that will live for two growing seasons
  18. 26. applied before the crop is seeded and is usually applied as part of seedbed preparation
  19. 27. have long, narrow leaves with parallel veins
  20. 29. a plant that completes its life cycle within one growing season
  21. 30. the portion of the stem between the cotyledons and the seedling roots