Department of Plant Pathology, Punjab Agricultural University, Ludhiana-141004
National Symposium on “Plant Pathology in the Changing Global Scenario” held at National Bureau of Plant Genetic Resources, New Delhi on February 27–28, 2009
Citrus foot rot or gummosis caused by Phytophthora parasitica is one of the major diseases in citrus causing decline of plants in nursery and orchards. The incidence of disease varies from 10 to 30 per cent in commercial orchards. In order to manage the disease, various fungicides namely; Ridomil MZ 72 WP, Ridomil Gold 68 WP, Aliette 80 WP, Curzate M 8, Blitox-50 WP, Bordeaux mixture and Kocide 3000 were screened in vitro each at a concenteration of 25, 50, 75 and 100 ppm employing food poison technique using PDA. Among the fungicides tested, Ridomil Gold 68 WP, Ridomil MZ 72 WP and Curzate M 8 were found significantly effective. Ridomil Gold 68 WP and Ridomil MZ 72 WP exhibited 100 per cent growth inhibition at 25 ppm whereas Curzate M 8 showed 100 per cent growth inhibition at 50 ppm. Blitox-50 WP, Kocide 3000 and Aliette 80 WP showed 50 per cent growth inhibition at 100 ppm. However, the Bordeaux mixture at 100 ppm registered the least (24 per cent) inhibition of the fungal growth. The results revealed that Ridomil Gold 68 WP, Ridomil MZ 72 WP and Curzate M 8 are the most promising fungicides and can be used for controlling the disease under field conditions.
