ISHS Acta Horticulturae 369: Symposium on Small Scale vegetable production and Horticultural Economics in Developing Countries
VIRUS DISEASES OF SHALLOT AND GARLIC IN JAVA, AND PROSPECTS FOR THEIR CONTROL |
| Authors: | R. Sutarya, P. Dijk |
| Abstract:
Our survey in different high- and lowland areas in West and Central Java revealed that SYSV (shallot yellow stripe virus) was present in all shallot samples in incidences of at least 52% to usually less than 100%. Symptoms ranged from severe striping to very mild striping. OYDV (onion yellow dwarf virus) was present in high incidence in shallot in the large shallot cultivation area around Cirebon, Brebes and Tegal, but in low to zero incidence in other areas. This, and the results of the survey at Wageningen, during which OYDV had not been detected in shallot collected from Indonesia in 1987 or imported from other Asian countries, may indicate that OYDV was introduced only some years ago in the Cirebon, Brebes and Tegal area. SYSV, in contrast, is native to Asia. OYDV-infected plants showed severe striping, chlorosis, and sometimes additional malformation. At least 80% of the shallot breeding lines grown for four years at Tegal were infected by OYDV. The rate of spread of OYDV appeared much higher that of SYSV. Plants of garlic observed in the fields in different highland areas in West and Central Java usually showed striping due to OYDV-G and LYSV-G. Largely varying symptom severity is known to result from differences in virulence of virus isolates present in individual plants. On an average, 87% of the plants contained OYDV-G and 18% contained LYSV-G. | |
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