Scientists from the University of Delaware, USA, have recently uncovered critical information about the effect that deadly rice blast fungus has on rice plants, which could lead to more effective effective control measures in the fight against this disease. The team found that Magnaporthe grisea, the fungus responsible for rice blast, causes an increase in the production of abscisic acid in the plant on infection. Abscisic acid is a stress hormone usually released during times of drought to prevent the plant from losing water through holes in its leaves. However, it has been found that this hormone also causes a reduction in the disease fighting mechanisms of the plant.
The first factsheet of the month for 2016 ‘Blast in Paddy‘ contains information on the current methods of control used to manage rice blast in rice, or paddy as it is sometimes known. This Pest Management Decision guide was written by Mr G. Sudhakar from the M S Swaminathan Research Foundation (MSSRF), India.
Story by Malvika Chaudhary, CABI in India
Photo: Saurav Paul
Vargur is a small village in the Tamil Nadu state of India where paddy is grown on a large scale. The plant clinics in this region are very popular with farmers. For plant doctor Sarangpani it was a usual day, anticipating the regular crowd of paddy farmers in his plant clinic. He enjoyed this interaction with them, especially after improving his pest diagnostic and advisory skills through training provided by Plantwise and research non-profit M S Swaminathan Research Foundation (MSSRF). His rich experience as a farmer in the past had now translated into service for his community through these regular plant clinics.
Though ‘samba,’ or long grain rice season was usually quiet, this time Balchander and many farmers like him had a different story. The farmers had been seeing white spots on the young leaves of their paddy plant, which began to turn to grey-green in couple of days, bringing them increasing worry. It was time for plant doctors like Sarangpani to take immediate action to try and help Balchander and his neighboring paddy farmers.