These nematodes, sold under the names of Scanmask and Nemasys, are microscopic, wormlike creatures that will destroy the fungus gnats but are not harmful to people, pets, plants, or earthworms. These products can be used whenever the soil is not frozen and will keep working for many months.
Vegetative structures. There are three levels of integrated organization in the vegetative plant body: organ, tissue system, and tissue. The organs of the plantâthe roots, stems, and leavesâare composed of tissue systems (dermal tissue, ground tissue, and vascular tissue; see below Tissue systems).
A plant's organ system works with the roots anchoring the plant and absorbing water and nutrients, while the shoots transfer the nutrients to the leaves, which transfer light into energy via photosynthesis. A plantâs roots, leaves and stems, the three basic plant organs, work together to allow the plant to function.