Ecofriendly Management of Maydis Leaf Blight (Helminthosporium maydis) of Maize
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Date
2017
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Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur)
Abstract
Maize (Zea mays L.) popularly known as "corn” is queen of cereals due to its high yield efficiency, important human nutrient, basic element of animal feed etc. Maydis leaf blight disease of maize causes considerable losses to the maize crop. The present investigations on “Ecofriendly management of maydis leaf blight (Helminthosporium maydis) of maize” were undertaken to explore the possibilities of botanicals and fungicides for the management of maydis leaf blight (Helminthosporium maydis) disease.
Among five fungicides evaluated at different concentrations (50, 100, 150, 200, 250) in vitro against H. maydis by poison food technique, propiconazole showed 100 per cent inhibition of mycelia growth were recorded at 150, 200 and 250 ppm followed by mancozeb which caused 92.37 per cent inhibition at 250 ppm and minimum inhibition was recorded in copper oxychloride at all the concentrations (70.63, 72.26, 75.55, 76.82 and 79.48).
Of the six plant extracts evaluated by poison food technique for their inhibitory effect on the growth of H. maydis, the neem leaf extracts shoed strong
inhibitory effect at all concentration followed by parthenium at 10and 20 per cent and garlic cloves at 30, 40 and 50 per cent concentrations.
Out of the 128 genotypes screened under artificial inoculated conditions, 29 genotypes appeared resistant, 44 genotypes were moderately resistance to maydis leaf blight, 52 genotypes were rated as moderately susceptible and 3 genotypes found susceptible.
All fungicides and plant extracts screened under in vitro, were further evaluated under field conditions against maydis leaf blight disease. Three sprays of propiconazole and mancozeb proved to the most effective fungicides recording the lowest disease incidence 34.75 and 53.20 per cent, respectively as against control treatment (79.67 PDI). However, neem leaf extracts and garlic cloves @ 10% showed maximum (51.30 and 59.10) disease incidence.
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