Transcript Plant Disorders - Mid

Plant Disorders
Diseases
Powdery Mildew
The disease is easily recognizable as a white to gray powdery growth on
leaves and sometimes stems and flowers.
Treat with a Fungicide
Botrytis (Gray Mold)
Brown, water-soaked spots appear on petals. Woolly
gray fungus spores form on soft, brown, decayed tissues;
fungus may invade plant tissue that touches infected
petals.
Treat with Fungicide
Mosaic Virus
Symptoms of Mosaic show yellow and green mottling, upward
leaf curling, leaf distortion and overall stunting.
This virus is transmitted by tools and workers as well as plant to
plant contact where there wounds caused by handling or
insects. There is no cure or treatment for Mosaic. Discard
infected plants and thoroughly disinfest growing areas.
Treat with Fungicide
Anthracnose leaf spot
leaf spot symptoms appeared as small round, tan leaf spots
Treat with fungicide
Rhizoctonia
Rhizoctonia is a natural inhabitant of the soil and can survive there
indefinitely. The pathogen is widely distributed, has a wide host range,
and causes diseases such as damping-off, root rot, crown rot, stem
cankers, and web blight.
Treat with fungicide
Pythium Root Rot
Signs of Pythium root rot fungi on poinsettias are wilting and
stunting. Roots are soft and decayed, sometimes extending up
into the stem where it causes a canker.
Treat with fungicide