Agriculture Reference
In-Depth Information
Figure 3.13
Dandelion is a simple perennial that can reproduce by seed or by
root cutting.
b.
Algae
Algae are aquatic plants without true stems, leaves, or vascular systems.
For control purposes they may be classified as:
•
plank ton algae—microscop ic plant s float ing in the water. They
sometimes multi ply very rapidly and cause "bloo ms" in which the
surface water appears soupy green , brown , or reddi sh brown , depend-
ing on the algal type.
Figure 3.16
shows a floating alga mass.
•
filamentous algae—long, thin strands of plant growth which form
floating mats or long strings extending from rocks, bottom sediment,
or other underwater surfaces. Examples are cladophora and spirogyra.
•
macroscopic freshwater algae—these larger algae look like vascular
aquatic plants. The two should not be confused, because their control is
different. Many are attached to the bottom and grow up to 2 feet tall.
However, they have no true roots, stems, or leaves. Examples are chara
and nitella.
