da Cunha Sobrinho, Almir Pinto

da Silva Coelho, Ygor

Passos, Orlando Sampaio

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UC RiversideInternational Organization of Citrus Virologists Conference Proceedings (1957-2010)TitleMore Information on Psorosis Disease in Bahia, BrazilPermalinkhttps://escholarship.org/uc/item/93c1771mJournalInternational Organization of Citrus Virologists Conference Proceedings (1957-2010), 6(6)ISSN2313-5123AuthorsPassos, Orlando Sampaioda Silva Coelho, Ygorda Cunha Sobrinho, Almir PintoPublication Date1974DOI10.5070/C593c1771m Peer reviewedeScholarship.org Powered by the California Digital LibraryUniversity of CaliforniaPSOROSIS and RELATED DISEASES More Information on Psorosis Disease in Bahia, Brazil Orlando Sampaio Passos, Ygor da Silva Coelho, and Almir Pinto da Cunha Sobrinho In  197 1, bark symptoms of psorosis were first reported on some uninoculated citrus trees, in Bahia, propagated from nucellar budwood (2). Sweet orange varieties involved included Bahia, Bai- aninha, Natal, Pera, Hamlin, Caipira (common), Piralima, Lima, Parson Brown, Pineapple, Westin, and Blood Oval. Symptoms were also observed on Dancy and Oneco tangerines and on the hybrids Kinnow, Robinson, and Osceola. More recently, bark symptoms of pso- rosis were seen in 100 per cent of the Pera sweet orange trees in an experi- mental trial in which trees had been propagated from nucellar budwood and from seeds originating at the Limeira Experiment Station of the Instituto AgronGmico, SHo Paulo. Psorosis bark symptoms also were seen on 57 per cent of some 10-year-old nucellar Hamlin sweet orange trees in a commercial orchard. These determinations of psorosis in nucellar lines were made only on the basis of bark symptoms. I t  is unlikely that this bark scaling was the result of leprosis or a related condition, since leprosis has not been described in Bahia and no symptoms were seen on leaves or fruit. If these symptoms are truly those of psorosis, then transmission from pso- rosis-infected to nucellar trees must be occurring in the field in Bahia. This would be similar to the situation de- scribed by Pujol (3) for the Concordia area of Argentina. Final diagnosis of psorosis requires young-leaf symptoms, which are found elsewhere, but which have been re- ported as not occurring in Bahia (1) .  In 1971, we attempted to obtain leaf symptoms of psorosis in inoculated in- dicators. Psorosis donor plants were the sweet orange variety Do Ceu (Heaven orange), propagated from psorosis-in- fected budwood supplied by Dr. Sylvio Moreira from the Limeira Experiment Station and from Bahia, and Pera sweet orange varieties of local origin. Tissue from these p!ants was grafted into seed- lings of Caipira sweet orange. Oak leaf and vein-flecking symptoms were seen occasionally in the Do Ceu donor plants, but no such symptoms were seen in the local varieties and none developed in the Caipira indicators. In view of the inconclusive nature of these tests, budwood from affected nucellar trees and from our Bahia and Pera sweet orange trees is being in- dexed at the Limeira Experiment Sta- tion. We have also set up a new index- ing trial near Bahia at -an altitude of 1,000 meters. Average temperature is lower and temperature fluctuation is greater at this new location than at our experiment station at Cruz das Almas. some uninoculated nucellar citrus trees in Bahia exhibit the "popcorn" symptom on trunk bark (eruptive pus- tules usually less than 1 cm in diam- eter), which may indicate the presence of psorosis (4). Budwood from these trees is also being indexed in  Bahia and at Limeira in S5o Paulo. Sixth ZOCV Conference LITERATURE CITED 1. PASSOS, 0. S. 1965. Absence of young-leaf symptoms of psorosis in the State of Bahia, Brazil. In: Proc. 3rd Conf. Intern. Organ. Citrus Virol. (W. C. Price, ed.) Gainesville: Univ. Florida Press, pp. 167-69. 2. P~ssos, 0. S., AND A. P. C. SOBRINHO 1971. Sorose em clones nucelares no Estado da Bahia. CiCncia e Cultura 23:208. 3. PUJOL, A. R., AND H. N. BERATENA 1965. Study of psorosis in Concordia, Argentina. In: Proc. 3rd Conf. Intern. Organ. Citrus Virol. (W. C. Price, ed.) Gainesville: Univ. Florida Press, pp. 170-74. 4. ROSSETTI, V., AND A. A. SALIBE 1965. Incidence of different types of psorosis in citrus varieties in the State of S5o Paulo. In: Proc. 3rd Conf. Intern. Organ. Citrus Virol. (W. C. Price, ed.) Gainesville: Univ. Florida Press, pp. 150-53. 

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More Information on Psorosis Disease in Bahia, Brazil

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More Information on Psorosis Disease in Bahia, Brazil

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