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Diseases : Rhizactonia Root and Stem Rot
Rhizoctonia is a fungus that is found in most soils and enters the plant
through the roots or the stem at soil level.
Prevention and Control: First of all, do not overwater and if you suspect
Rhizoctonia may be your problem, decrease watering. If a plant is too far gone
(all the leaves from the bottom up are wilted), remove it. If your plant is in a container, discard the soil too.
Wash the pot with a 1 part bleach to 9 parts water solution.
Fungicides can be used, according to label directions. Consult a professional for a legal recommendation of what fungicide to use.
Diseases : Pythium and Phytophtora Root Rot
Rot Rot, Pythium or Phytophthora occurs when soil
moisture levels are excessively high and fungal spores present in the soil, come
in contact with the susceptible plant. The base of stems discolor and shrink,
and leaves further up the stalk wilt and die. Leaves near base are affected
first. The roots will turn black and rot or break. This fungi can be introduced
by using unsterilized soil mix or contaminated water.
Prevention and Control Remove affected plants and their roots, and discard surrounding soil. Replace with plants that are not susceptible, and only use fresh, sterilized soil mix. Hold back on fertilizing too. Try not to
over water plants and make sure that soil is well drained prior to planting.
This fungus is not treatable by chemicals.
Rhizoctonia Root and Stem Rot symptoms look similar to Pythium Root Rot, but the Rhizoctonia fungus seems to thrive in well drained soils.
Fungi : Leaf Spots
Leaf spots are caused by fungi or bacteria. Brown or black spots and patches may be either ragged or circular, with a water soaked or yellow-edged appearance. Insects, rain, dirty garden tools, or even people can help its spread.
Prevention and Control: Remove infected leaves when the plant is dry. Leaves that collect around the base of the plant should be raked up and disposed of. Avoid overhead irrigation if possible; water should be directed at soil level. For fungal leaf spots, use a recommended fungicide according to label directions.