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Effect of Base Analogues on Strains of Citrus Tristeza Virus Balaraman K. Indian Institute of Horticultural Research, Banaglore-560 080. Summary Inhibitory action of two base analogues viz., 2-thiouracil (pyrimidine base) and 8-azaguanine (Purine base) at 250 and 500 ppm were tested against very mild (S1) and very severe (S5) strains of tristeza virus on acid lime after incubating the bud and bark pieces at 6, 12, 24, 36 and 48 hours. The 6-month old acid lime seedlings when inoculated with bark/bud pieces delayed the symptom expression 6 to 12 and 12 to 16 weeks respectively for severe and mild strains. Prolonged inocubation period and increased concentration of base analogues further delayed the symptoms for 4 weeks. Aphid inoculation with one month old seedlings kept in 500 ppm test solutions, showed a delay of only 4 and 6 week respectively for severe and mild strain. Further, the vein clearing and stem pitting pattern has been found altered by the test chemicals. Top | |
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