Horticulture / Fertiliser

1. Something which kills insects.
3. green matter in plants and the essential molecule for photosynthesis.
6. Someone who has extensive knowledge of plants, their care and their requirements for survival.
13. disease caused by the fungus Colletotrichum
14. Something which kills mites.
16. the practice of applying water slowly through various types of pipes, tubes or specialized hoses.
17. Having a pH below 7.
19. Something which kills fungi but not kill the spores.
20. systems in which no chemicals are used.
21. decayed organic matter.

2. The part of a plant where the roots and stem meet, usually at soil level.
3. The transfer of pollen from one plant variety to another.
4. Requiring available oxygen to live.
5. Well-defined, generally angular, discolored zones on leaves.
7. Plural of fungus.
8. Something which kills nematodes.
9. the practice of applying supplemental water to plant and lawn areas.
10. product containing plant macronutrients
11. Any substance used to decompose organic matter to prepare compost.
12. A plant killer. Herbicide injury on non-targeted plants can mimic certain diseases.
15. Synthetic substances used to kill and assortment of pests that might include weeds and insects.
18. Applied agricultural science dealing with rural economy and husbandry.