01312naa a2200169 a 450000100080000000500110000800800410001910000160006024501550007626000090023152007960024065000110103670000150104770000160106270000180107877300460109616483432023-05-25       1987    bl uuuu     u00u1 u    #d1 aWANG, H.-L.  aEffectiveness of Cross-Protection by mild mutants of Papaya ringspot virus for control of ringspot disease of Papaya in Taiwan.h[electronic resource]  c1987  aTwo mild nitrous acid-induced mutants (PRV HA 5-1 and 6-1) of papaya ringspot virus (PRV) were tested under greenhouse and field conditions to study the potential of cross-protection for control of papaya ringspot disease of papaya in Taiwan. Under greenhouse conditions, both mutants caused only mild or symptomless infection on test plants in Chenopodiaceae and Cucurbitaceae families and on the major papaya cultivar of Taiwan, Tannung No.2. Also, under greenhouse conditions, HA5-1 and HA 6-1 provided a high degree of protection in papaya against the severe effects of two prevalent PRV strains of Taiwan. Large numbers of papaya seedlings were infected by applying inocula with a spray gun (equipped with a 1.2-mm-diameter nozzle), using pressures of 4-8kg/cm2 at distances of 10-20cm.  aMamão1 aYEH, S.-D.1 aCHIU, R.-J.1 aGONSALVES, D.  tPlant Diseasegv.71, n.6, p.491-497, 1987