Category Archives: Uncategorized

Diseases of Grapes

Diseases of Grapes Diseases of Grapes 1.Downy mildew: Plasmopara viticola Symptoms Irregular, yellowish, translucent sports on the upper surface of the leaves.Correspondingly on the lower surface, white, powdery growth on leaves. Affected leaves become, yellow, brown and gets dried. Premature defoliation. Dwarfing of tender shoots. Brown, sunken lesions on the stem. White growth of fungus…

Diseases of Pomegranate

Diseases of Pomegranate Diseases of Pomegranate 1.Cercospora fruit Spot: Cercospora sp. Symptom The affected fruits showed small irregular black spots, which later on coalesce, into big spots. Management The diseased fruits should be collected and destroyed. Two to three spray at 15 days interval with Mancozeb 0.25%. 2.Leaf Spot or Blight: Colletotrichum gloesporioides; Pseudocercospora punicae; Curvularia lunata and…

Diseases of Papaya

Diseases of Papaya Disease of Papaya 1.Stem rot / Foot rot – Pythium aphanidermatum Symptoms Water soaked spot in the stem at the ground level which enlarge and griddle the stem. The diseased area turns brown or black and rot. Terminal leaves turn yellow droop off. The entire plant topples over and dies. Forward by rain.…

Diseases of Guava

Diseases of Guava    Disease of Guava  Anthracnose: Colletotrichum gloeosporioides Symptoms Symptoms of this disease are observed on mature fruits on the tree. The characteristic symptoms consist of sunken, dark colored, necrotic lesions. Under humid conditions, the necrotic lesions become covered with pinkish spore masses. As the disease progresses, the small sunken lesions coalesce to form…

Diseases of Apple

Diseases of Apple Diseases of Apple 1.Scab –Venturia inaequalis Symptoms Symptom appears on leaves and fruits. On lower side of the leaf lesion appear as olivaceous spots which turn dark brown to black and become velvety. On young foliage, the spots have a radiating appearance with a feathery edge. On older leaves the lesions are…

Diseases of Chilli

Diseases of Chilli Diseases of Chilli 1.Damping off: Pythium aphanidermatum Symptoms: Seedlings killed before emergence. Water soaking and shrivelling of stem. Factors favouring infection:Moist soils poordrainage 90-100% R.H soil temperature 20°C. Pathogen Mycelium is hyaline, coenocytic and zoosporangia are lobed and branched. Zoospores are biflagellate and oogonia are spherical with smooth walled.Antheridia are monoclinous, intercalary or…

Diseases of Brinjal

Diseases of Brinjal Diseases of Brinjal  1.Bacterial Wilt: Pseudomonas solanacearum Symptoms Bacterial wilt symptoms on leaf surface Wilting, stunting, yellowing of the foliage and finally collapse of the entire plant are the characteristic symptoms of the disease. Lower leaves may droop first before wilting occurs. The vascular system becomes brown. Bacterial ooze comes out from the…

Diseases of Bhendi

Diseases of Bhendi Diseases of Bhendi  1.Cercospora Leaf Spots:Cercospora malayensis,C. abelmoschi Symptoms In India, two species of Cercospora produce leaf spots in bhendi. C. Malayensis causes brown, irregular spots and C. abelmoschi causes sooty black, angular spots.Both the leaf spots cause severe defoliation and are common during humid seasons. Pathogen Conidiophores are pale to medium…

Diseases of Cucumber and squash

Diseases of Cucumber and squash  Diseases of Cucumber and squash  1.Vascular Wilt: Erwinia tracheiphila Symptoms Symptoms of the disease first appear on a single leaf which suddenly wilts and becomes dull green. The wilting symptoms spread up and down the runner sometimes as a recurring wilt on hot, dry days. Soon infected runners and leaves turn…

Disease Of Musk melon and water melon

Diseases of melon Musk melon and water melon 1.Gummy Stem Blight – Mycosphaerella melonis Symptoms Infected stems first appear water-soaked and then become dry, coarse and tan. Older stem lesions (dead tissue) reveal small black fruiting bodies (pycnidia) within the affected tissues. Large lesions girdle stems and plants wilt in the heat of the day. Stem…