Category Archives: Plant Pathology

Blister Blight of tea What is the causal organism of blister blight of Tea? Fungus called Exobasidium vexans What are the symptoms of blister blight of Tea? Folowing are the symptoms of blister blight of tea 1. Small pale or pinkish circular spots appear on leaves and attain a size of 2.5 cm diameter 2. The spots in the upper surface of the leaf becomes light brown in color and depressed while in under surface of leaf it bulges farming a blister like swelling 3. Lower budget portion is covered with a white powdery growth of fungus 4. When many […]

Yellow vein mosiac of okra How to identify Yellow vein mosaic of okra? Identify Yellow Vien Mosiac of Okra / Bhendi / Ladies finger by its characteristic  Symptoms – 1. Yellowing of the entire network of veins in the leaf blade (vein clearing) is the characteristic symptom 2. In severe infections the younger leaves turn yellow, become reduced in size and the plant is highly stunted 3. In a field, most of the plants may be diseased and the infection may start at any stage of plant growth You may also like to read other related articles – Okra / […]

In India, the phomopsis blight of brinjal was reported in 1935 in Gujarat How to identify Phomopsis blight of brinjal? Identify phomopsis blight disease by its characteristic symptoms – 1. The plants are attacked at all stages of growth – producing damping-off symptoms in nurseries and collar rot on young plants 2. On leaves, circular to irregular, clearly defined grayish brown spots having light centers appear 3. The diseased leaves become yellowish in colour nd may drop off 4. Several black pycnidia can be seen on older spots 4. The lesions on stem are dark brown, round to oval and […]

  How to identify Alternaria leaf Spot of brinjal? Identify the Alternaria leaf spot disease based on the following symptoms 1. Cracks appearing in leaf spot 2. The two species of Alternaria occur commonly, causing the characteristic leaf spots with concentric rings 3. The spots are mostly irregular, 4-8 mm in diameter and may coalesce to cover large areas of the leaf blade Severely affected leaves may drop off 4. A. melongenae also infects the fruits causing large deep-seated spots 5. The infected fruits turn yellow and drop off prematurely Visual identification You may also read other related articles – […]

  How to identify Cercospora leaf spot of brinjal? Identify this disease by its characteristic Symptoms 1. The leaf spots are characterized by chlorotic lesions, angular to irregular in shape, later turn grayish-brown with profuse sporulation at the centre of the spot 2. Severely infected leaves drop off prematurely, resulting in reduced fruit yield Visual identification You may also like to read other related article – Little leaf of Brinjal; Identification, Control | Agristudent.com Bacterial Wilt of Brinjal – Symptoms, Control | Agristudent.com Which organism causes cercospora leaf spot in brinjal? The causal organism is a fungus called Cercospora solani […]

Bacterial wilt of brinjal is an important disease of solanaceous crops like tomato, brinjal, potato etc How to identify bacterial wilt of brinjal? Identify bacterial wilt of brinjal disease with the help of typical symptoms it shows – 1. Sudden wilting and death of infected plants is the characteristic symptom 2. The petiole of older leaves droop down and the leaves show epinasty symptoms accompanied by yellowing and stunting of whole plant 3. Typical browning of vascular tissues of roots and stems 4. From cross sections of infected plants whitish bacterial exudate comes out You may also like to read […]

The little leaf of brinjal is a very important disease. If unchecked it can directly affectnthe yield by causing no fruiting How to identify little leaf disease of brinjal? Identify this disease by its typical symptoms as below – 1. The leaves remain small so mucb that they have very short petioles and appear to be sticking to the stem 2. Affected plants have narrow, soft, smooth and yellow shorter leaves 3. Newly formed leaves are much shorter 4. Internodes of the stem are also shortened 5. plants get a bushy appearance because internodes are shortened 6. Mostly there is […]

Mycoherbicides Mycoherbicides infected weeds The fungal pathogens that control specific weeds and continue to survive on the weeds year after year are called Mycoherbicides Fungal pathogens as a bioagent in controlling weeds are more popular than bacterial, viral or nematodes because, most of the plant pathogens are fungi, which are destructive and widely prevalent, and they can be safely used in organic farming. Phytopathogens normally initiate diseases in specific weeds and produce phytotoxins killing the weeds within 3-5 weeks. Characteristics of mycoherbicides They should be culturable in artificial media They should produce abundant spores They should be stable in storage […]

Nematodes in Plants: types, hosts and symptoms states information about various types of plant nematodes along with their scientific names and symptoms and will help in answering questions like 1. What are different types of nematodes affecting crop plants 2. What are symptoms of different types of nematode infested crop plants? Study of plant nematodes is very important since nematodes are responsible for causing crop losses in the range of 20 to 23 percent every year in India. Watch this Video on Basics of Nematology   The information about nematodes affecting crop plants is given below Seed gall nematode It […]

Crown gall of apple causing bacterium has a use in biotechnology as a gene transfer vector. Also read other related articles Apple scab Causal organism Bacteria called Agrobacterium tumefaciens Symptoms Small outgrowths on stem and roots near soil line Galls are spherical, white or flesh coloured (young stage) Galls become hard and corky on woody stems, knobby and knotty Affected plants stunted with chlorotic leaves Management Regulatory measures Crop rotation with maize or other grain crops Avoid injuries to roots or lower stem parts Agrobacterium radiobacter (Strain K1026) should be applied to fresh wounds Further reading on crown gall of […]