RED GRAM :: MAJOR DISEASE :: STERILITY MOSAIC DISEASE

RED GRAM :: MAJOR DISEASE :: STERILITY MOSAIC DISEASE

Sterility Mosaic Disease (SMD) - Pigeonpea sterility mosaic virus (PPSMV)
Symptoms
The Symptoms are characterized by bushy and pale green appearance of plants.The excessive vegetative growth, stunting, prominent mosaic on leaves and reduction in leaf size. Complete or partial cessation of flowering leads to sterility. Depending on genotype three types of symptoms are recognized. They are

Severe mosaic and sterility
Mild mosaic and partial sterility
Chlorotic ringspot without any noticeable sterility.


Pigeonpea sterility mosaic virus - Light and dark green mosaic pattern on leaves	Pigeonpea sterility mosaic virus - Sterility mosaic infected plant (right side) without flowers and pods compared to normal plant (left side)

Pathogen
It is caused by Pigeonpea sterility mosaic virus (PPSMV).The virions are slender highly flexuous filamentous virus like particles (VLPS) of 3-10 nm diameter, a major virus specific proteins of 32kDa and 5-7 major RNA species of 0.8-6.8kb.
Disease cycle
It is not transmitted by infectious sap. It is transmitted by an eriophyid mite, Aceria cajani in a semi persistant manner, mites retaining the virus 12-13 hours, eggs of mites do not transmit. The self grown redgram plants and perennial species act as source of virus inoculums.
Management

Rogue out infected plants up to 40 days after sowing.
Spray Monocrotophos at 500 ml/ha soon after appearance of the disease and if necessary, repeat after 15 days.
Grow resistant genotypes/cultivars like ICP 7035, VR3, Purple 1, DA11, DA32, ICP 6997, Bahar, BSMR 235, ICP 7198, PR 5149, ICP 8861 and Bhavanisagar 1.