This document discusses several plant diseases that affect Datura plants: 1. Leaf spot is caused by Alternaria tenuissima and causes severe defoliation and economic loss through dark brown spots on leaves. 2. Leaf blight is caused by Alternaria alternate and appears as water soaked spots that turn yellow and brown as the infection spreads and causes leaf curling. 3. Root rot is caused by Sclerotium rolfsii and Corticium solani, which cause wilting, yellowing and death of plants through root and foot rot. Young plants are more susceptible. 4. Leaf blight and fruit rot is caused by Alternaria cressa, which causes spots on leaves that spread

1. Virus : Datura wilt virus, Datura distortion mosaic virus, Datura
rugose leaf-curl virus, and Datura quercina virus
Wilt of Datura : Sclerotium rolfsfi
Root Rot of Dature: Corticium solani
Leaf spot of datura: Alternaria tennussima

2. DISEASE OF DATURA
Leaf spot: this disease was found on the leaves of Datura
stramonium, D. Metel, D. Innoxa. A large number of plant
growing in experimental plantation were found to suffer by the
disease.
Cause: Alternaria tenuissima (Fr)Wiltshire
Symptoms: the infection cause severe defoliation resulting in
considerable economic loss. Spot are characteristically dark
brown, round to oval or slightly irregular, coalescing and
formed large necrotic area

3. Leaf blight Datura
Datur innoxia growing in experimental and commercial plantation was
found to suffer from leaf blight disease.
Cause: Alternaria alternate
Symptoms: Early infections of the disease appear as water soaked
circular spots on the leaves. In later stage the spot coalesce, become dull
yellow and turn light brown due to the death of infected tissue.
Concentric ring appears on the dead tissue of old spots. A single spot on
a leaf cause curling of entire leaf in advance stage of infection. Wilting of
the entire branches occurred when two or three leaves of branches are
affected.
Control: No disease management for the disease reported. However,
fungicidal spray using dithiocarbamates, such as Dithane Z-78 or dithane
M-45would be useful for control the disease.

4. Root rot Datura
Cause: Sclerotium rolfsii Sacc. and Corticium solani(Peril and Delacr)
Bourd and Glaz
Symptoms: infected plants showed yellowing, gradual wilting resulting
in the death of plants. Root and foot rot diseases shows almost similar
symptoms were observed in experimental plantations. The disease
affected plants of all ages, more destructive on young plants. Seedlings
showed damping off and were killed within a week. In mature plant older
leaves showed yellowing as the disease advanced, severe rotting
occurred leading to death and disintegration of plants.
Disease management: usual disease management includes
disinfestations of planting material, adjacent of soil pH and fertilizer
regim. Cultural methods, such as deep burial of infected crop rotation are
often beneficial. Use of soil fumigant suchas formalin, methyl bromide is
also beneficial. Pentachlorobenzen is considered to be useful to control
fungus.

5. Leaf blight and fruit rot Datura:
Datura metel and Datura stamonium growing in the experimental plot
were found affected by this disease. Leaf blight and pod blight were
reported on D. metel from Israel. Similar disease found on D.
stramonium in Luknow, India.
Pathogen : Alternaria cressa (Sac) Rands
Symptoms: the infection is first observed on leaves as small necrotic
spots. The infection later spread to the fruits resulting in fruit blight and
rot.the mycelium penetrate beneath the seed coat in most infected seeds.
Disease management: excellent control of the fungus was achieved by
disinfection with Thiram suspension.