01512naa a2200181 a 450000100080000000500110000800800410001910000160006024501000007626000090017652009970018565000120118265000100119465300150120465300240121970000170124377300700126018384922012-06-18       1986    bl ---       0--  u    #d1 aHAIT, G. N.  aProtection of wheat seedlings from Helminthosporium infection by seed treatment with chemicals.  c1986  aTwenty of twenty-four chemicals known to induce phytoalexin production in other plants, when used to soak seed, provided effective protection to 3-week-old susceptible wheat seedlings against inoculation with Helminthosporium sativum. The number of lesions was very significantly reduced in most of these treatments and there was evidence for inhibition of lesion expansion in a few. Studies with twelve of the more effective chemicals showed that the protective effect persisted at significant levels even in 5-week-old plants and that at this stage the inhibitory effect on lesion expansion was more pronounced in most of the treatments. Different treatments led to the development of a moderate to high level of fungitoxicity in young wheat seedlings which gradually declined with age of the plant and disappeared in 5-week-old plants. When inoculated at the age of 3 or 5 weeks, plants receiving most of the treatments developed appreciably higher fungitoxicity than the untreated plants.  aDoença  aTrigo  aProteção  aTratamento químico1 aSINHA, A. K.  tJournal of Phytopathology, Berlingv. 115, n. 2, p. 97-107, 1986.