12th botany neet school

Groundnut or peanut – Arachis hypogea

Groundnut or peanut – Arachis hypogea

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Tikka disease of groundnut

Pathogen Disease incited by a fungus Cercospora personata.
Systematic position The fungus belongs to class Deuteromycetes.


Lesions appear on the leaves, when the plants are atleast two months old. The symptoms appear in July and continue upto maturity of the plant.

The lesions on the leaves are rounded and 1 to 6 mm in diameter. These spots are dark brown or black and found on both surfaces of the leaf. Yellow border develops around each such leaf spot.


The mycelium of Cercospora personata is brown, septate branched
and slender. Branched haustoria are produced to absorb food materials from the host tissue.

The conidia are long and septate. Each conidiophore produces single conidium at its tip. The spread of the disease takes place by means of conidia which are dispersed by wind.


The disease can be controlled by sanitation and crop rotation. The
use of phosphatic and potassic manures reduce the disease. Sulphur dusting is quite effective. Resistant variety should be sown.

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Other links 

Plant physiology – photosynthesis and its significance

BIOLOGY IN HUMAN WELFARE Introduction & Food production

Aims of plant breeding

Aspects of plant breeding and Types

Hybridization in plant breeding

Polyploid breeding, Mutation breeding, Breeding for disease resistance

Genetic engineering, Improved varieties, Role of biofertilizers

Green manuring, Mycorrhiza as biofertilizer

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Crop diseases and their control, Rice – Oryza sativa

Citrus canker, Tungro disease of rice

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Genetically modified food

Bio war, Genetically Modified Organisms (GMO) in biological warfare

Biopiracy, Bioresources, Biomolecules, Biopatent, Biotechnology

Sustainable agriculture

Medicinal plants including microbes

Commonly Available Medicinal Plants

Microbes in medicine

Economic importance of Food plant Rice

Oil plant Groundnut Economic importance

Fibre plant – Cotton Economic importance

Timber yielding plant Teak Economic importance

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